Piaget And Vygotsky - Historial de revisiones

DarnellVde en 05:34 8 feb 2020

2020-02-08T05:34:55Z

← Revisión anterior		Revisión de 05:34 8 feb 2020
Línea 1:		Línea 1:
-	~~That would be STAM, the Ghent City Museum, where you can get~~ an overview of the ~~rich history~~ of ~~Ghent. Ghent a very walkable city~~ and ~~the local tourism board goes above and beyond~~ to ~~make sure visitors have all of~~ the ~~information and resources~~ needed to ~~make~~ the ~~most out of their time. These have now~~ been ~~transformed~~ into ~~a multi-purpose space where you can check out~~ the ~~art or just hang out~~. ~~So far 54 artworks are officially part of~~ the ~~Concrete Canvas tour showcasing street art in Ghent, which you can follow either~~ on ~~foot or by bike~~. ~~Recently we visited~~ the ~~hugely underrated Belgian city Ghent, situated just some three hours by train from Amsterdam, a perfect weekend destination for those who like culture, good food and… street art, as~~ we ~~recently discovered. A mix of sand and gravel, a cement binder and water, concrete is so widely embraced by architects, structural engineers, developers and builders because~~ it ~~is a remarkably good construction material<br><br>Just like interior, polished concrete~~ floors there are many color options available. Whether you’re remodeling existing concrete floors or pouring concrete for new construction, we’ll provide decorative concrete tools and materials. Instead, it's far in reality common in garages, pavements, driveways, and different varieties of ~~[https://www.sportsblog.com/search?search=outdoors%20floors outdoors floors] as a substitute, even as laminate flooring, vinyl floors, hardwood floors, and ceramic tiles are~~ used ~~for~~ the ~~interior~~. ~~If you adored this short article and you would certainly like~~ to get even more info relating to [http://stamped-concrete-border-d93579.educationalimpactblog.com/13728100/stamped-concrete-bow-nh-no-further-a-mystery Stamped Concrete Rye NH] kindly browse through our own internet site. Far from being just an experiment, EDCC cement is a commercial-ready product that has been designated as an official retrofit option in British Columbia, Canada. Our number one goal in residential and commercial applications is to provide the ~~best possible installation by being~~ the ~~most informative and knowledgeable installers in the paver industry~~. The ~~theodolite is also being produced~~ and ~~is intended for measuring angles both by standard~~ and ~~autocollimation methods, in industry when mounting elements and constructions~~ of ~~machines and mechanisms, for building industrial constructions and other purposes~~<br><br>~~Shot blasting can open~~ the ~~surface more than intended~~ and ~~leave deeper grooves where~~ the ~~blasting overlaps so it is not ideal for home applications~~. ~~Unsealed concrete requires extra effort~~ to ~~remove~~ the ~~stain from~~ the ~~surface. Not only does the production~~ of ~~Portland cement involve quarrying - causing airborne pollution in~~ the ~~form of dust -~~ it ~~also requires the use of massive kilns, which require large amounts of energy~~. ~~The newly-established Global~~ Cement and ~~Concrete Association (GCCA)~~, ~~currently representing about 35% of~~ the ~~world's cement production capacity~~ and ~~with a focus on sustainable development, was at COP24~~. ~~The GCCA is due~~ to ~~publish~~ a ~~set of sustainability guidelines~~, ~~which its membership will have~~ to ~~follow~~. ~~Typically~~ a ~~gas pump will last between 300 - 3000 hours, depending on the quality~~ of ~~the unit~~. ~~I actually wanted to do this tour when I was visiting Ghent last week, but I’d planned so many other things as well that in the end I simply didn’t have time left. As General~~ and ~~Engineering Contractors we have the possibilities of taking part~~ in ~~the development of complete projects from start~~ to finish. But with Chinese consumption now appearing to level off, most future growth in construction is expected to happen in the emerging markets of South East Asia and sub-Saharan Africa - driven by rapid urbanisation and economic development<br><br>To merge the Guided Blinding Light of Destiny into the Brilliant Blinding Light of Destiny you will need 10 undead slayer badges. Wet concrete surfaces need to be floated with a bull float before the bleed water comes up to the surface. Concrete is the second most consumed product in the world after water! Run of the mill campaigns usually incorporate a ~~[http://browse.deviantart.com/?q=strong%20message~~ strong message] to buy a specific product. How many pages does Blinding - novel - have? Blinding - novel - has 1132 pages. For over eight decades we have produced ready-mix concrete and have been a part of the local community on both a business and social level. They can be built from scratch using wood and there are usually several local companies that can build the ramp for you. A lot of people who are doing this with their concrete to try get it as close as possible to look like marble or wood floors<br><br>The ~~compensator~~ on the ~~vertical circle allows~~ to ~~make rapid~~ and ~~accurate measurements~~. The ~~axis configuration is identical~~ and ~~comprises the vertical axis~~, the ~~tilting axis~~ and ~~line of sight~~ . ~~Christmas vacation~~, so the ~~airport was pretty full~~--~~mostly families standing in line at the ticket counters~~, ~~kids arguing~~ and ~~parents labeling luggage. Throughout~~ the ~~game~~ you~~'ll acquire different "brushes~~.~~" There will be roughly 50~~ in ~~total, spread across five different colors~~. ~~Remove any debris from~~ the ~~area~~ and ~~spread some masonry sand over~~ the ~~surface~~. ~~Permaflow permeable~~ concrete ~~provides~~ the ~~optimal solution for surface~~ and ~~storm water management~~. ~~This flexibility~~ and ~~control~~ can be ~~achieved through~~ a ~~mechanism, where speed of water jet is controlled remotely~~ to ~~effectively handle all possible situations~~. 1 The ~~basic properties are unsurpassed range~~, ~~speed~~ and ~~accuracy of measurements~~. Or have a ~~low speed torrenting? The salaries of these countries are low~~ and ~~have~~ the ~~ability~~ to ~~produce large quantities of products at extremely low cost~~	+	Here is an overview of the advantages, as well as the limitations, of concrete staining and ideas for using stain to enhance your outdoor concrete. The poly does take longer to dry but in the long run it is worth using it! It no longer needed the small cage to limit and confine it; this cage, which once surrounded the tiger, had been transplanted into the tigers mind. This gives you a longer lasting sealer that is not as slippery since the solids aren't all built up on the surface. To apply the sealer we rolled it on the floors with the same type of roller we used to apply the stain. I used a paint brush to get the sides where the roller could not reach. The workers at Lowe’s and Home Depot will tell you that you cannot paint the floors with a solid color and then put the semi transparent concrete on top of the paint. This was paint we had left over from previous projects<br><br>Using pre-programmed mix designs eliminates the risk of using the wrong mix because the information is stored electronically and available at the touch of a button, Deering says. No part of the rebar or dowels ought to touch the types themselves as after kind removal the exposed ends of your rebar will rust and wick water inside the footing thereby weakening it. Cement mixers come in a wide range of types and models, making it difficult to find the best machine for your needs. Formwork and concrete form types. How to build a concrete garage base august 18, 2014 kids crafts art projects for kids, craft sticks, easy craft, painting, popsicle sticks, watercolors how to build a. Concrete garage base laying tips. How to build a concrete base for a garage show of hands:. You know those anatomy exhibits where they show dead bodies without skin? They are then cut and shaped in to different designs which eventual use every day<br><br>To merge the Guided Blinding Light of Destiny into the Brilliant Blinding Light of Destiny you will need 10 undead slayer badges. [http://www.shewrites.com/main/search/search?q=Wet%20concrete Wet concrete] surfaces need to be floated with a bull float before the bleed water comes up to the surface. Concrete is the second most consumed product in the world after water! Run of the mill campaigns usually incorporate a strong message to buy a specific product. How many pages does Blinding - novel - have? Blinding - novel - has 1132 pages. For over eight decades we have produced ready-mix concrete and have been a part of the local community on both a business and social level. They can be built from scratch using wood and there are usually several local companies that can build the ramp for you. A lot of people who are doing this with their concrete to try get it as close as possible to look like marble or wood floors<br><br>The foam panels are typically fully reversible, 2.5" thick by 16" tall by 48" in length. The plastic ties are typically 6" on center which provides incredible stability during concrete placement. Read More Concrete stamping tools and equipment are used on the final stage of the concrete installation. Contractor: Here the differences are the greatest and affect the type and amount of labor required for installation and also the waste factor. The differences between brands will not be noticeable to you. The most common brands are Best Construction Equipment, Kushlan and Star Industries. The most common ones are gas and electric mixers. Look for best prices for electric cement mixers on websites like Amazon, eBay and Walmart. Electric cement mixers come in different sizes and with different parts. Try to use white cement. You should perform standard due diligence and locate the best contractor and let the contractor use the product that he and his crew is most comfortable using. They all use the same basic components including a face shell of expanded polystyrene foam, a core of reinforced concrete and a plastic form tie that supports the face during concrete placement<br><br>125. In case you cherished this short article and you want to acquire more info with regards to [http://reidbvnew.pointblog.net/The-Stamped-Concrete-Ashburnham-MA-Diaries-28846146 Garage Floor Coating Pembroke NH] generously pay a visit to our own web-page. 00/ yd³ "someplace". Add rebar or steel mesh, a gravel sublayer, vapor barrier, and the cost climbs. We can help you with budgeting, specifications, and developing a cost effective plan for your project. Rob made this project look easy but it involved moving hundreds of pounds of concrete after the demolition and in the heat of the summer no less. The summer brings the reverse when we must cool our homes and manage the cooling during hot summer days. Most homes are built on a concrete slab, and the basement tends to be an unfinished storage area; Concrete construction is cheap, durable and effective. Most indoor slabs ARE finished with a steel trowel. Not if the slab was smoothed with a steel trowel. —Stained concrete requires minimal upkeep and is as easy to maintain as a standard slab of concrete. He says that such a slab can be roughened up with an abrasive wheel or a special brush-hammering tool<br><br>Maybe this would be a worthwhile approach if a subcontractor could be found that has special equipment to remove the old floor paint and roughen up the surface. The epoxies I have used in various situations have never called for the complete removal of the paint on a surface. Tough winters have been the normal lately so let A & A Concrete Specialties ease your burden with professional snow removal to make your life easier. Affordability, beauty, and durability make Stained Concrete a perfect fit inside or outside your home. In most cases, homeowners prefer to have a personalized as well as comfortable home and this is one of the reasons why they carry out swimming pool remodel in Santa Clarita Valley. Another advantage to using stamped concrete is that it can be applied to many different surfaces and textures, such as driveways, highways, patios, decks, and even floors inside the home

HaroldFerry5080 en 08:51 7 feb 2020

2020-02-07T08:51:06Z

← Revisión anterior		Revisión de 08:51 7 feb 2020
Línea 1:		Línea 1:
-	~~More on that lower below. Looking to~~ be ~~able to raise and lower water level in~~ the ~~dam quickly~~, ~~I built a gate. Heres a .gif I found on~~ the ~~web showing how the gate on the dam works~~. ~~The dam so far is~~ a ~~single log lined with plastic tarp, filled in with rocks, gravel~~ and ~~sand. Because of~~ the ~~success of this I am going~~ to ~~add~~ the ~~same~~ to the ~~down stream slope~~ of the ~~dam as well soon~~. ~~It works good but I need to add some kind~~ of ~~sealing strip to control leaking. They may also be used~~ in ~~backyards~~, ~~to add to~~ a ~~new favorite room to relax~~, ~~entertain~~, and ~~cook. Sometimes the work may be suspended~~ because of ~~the weather~~. ~~We are~~ a ~~small family owned business~~, ~~which gives us~~ the ~~opportunity to work one-on-one with each client~~. If you adored this ~~post~~ and you would certainly ~~such as~~ to ~~receive additional~~ info relating to [http://~~stampedconcretebackyardpa57912~~.~~collectblogs~~.com/~~19733723~~/an-~~unbiased~~-~~view~~-of-~~decorative~~-~~concrete~~-~~bristol~~-~~nh Decorative~~ Concrete ~~Wolfeboro~~ NH] kindly ~~check out~~ our ~~web~~-~~page~~. ~~Pile foundations are generally used for large structures~~. ~~Various offshore structural companies provides drafting~~ and ~~design services~~ for ~~various type of structures like residential, commercial, institutional, industrial~~ and ~~special mega structures like sky scrapers~~, ~~tunnels~~ and ~~bridges. For example~~, ~~if the independent key were shaped like a square, there would be an undercut (or draft, negative angle)~~ and ~~the blocks couldn’t be assembled~~<br><br>~~The critical chi-square value~~ is ~~read~~ from the ~~statistical table at () degrees~~ of ~~freedom~~. The ~~observed chi~~-~~square value is calculated using , where , ,~~ and ~~are as previously defined. The value of ranges from 0 to 1 regardless~~ of the ~~number of rankings~~. The ~~RII was calculated using the formulawhere~~ is ~~the weights given~~ to ~~each variable by the respondents~~, ~~ranging from 1~~ to 5, is the ~~highest weight (i.e~~., 5 in the ~~study), and is the total number of samples~~. ~~Table 6 shows agreement by professions on~~ the ~~advantages~~ of ~~using precast concretewhere is~~ the ~~mean~~ of ~~ranking and "" is the number of advantages being ranked~~. ~~Using Relative Important Index~~, ~~Table 5 revealed that professionals consider low life cycle cost~~ the ~~main advantage~~ of ~~using precast concrete products~~ and ~~space for acoustic insulation as the least. Construction professionals prefer the use of precast concrete construction mainly because of low life cycle cost, reduction of on~~-~~site waste, speed of construction,~~ and ~~quality of work done~~<br><br>~~Not many can say they own fragments~~ of ~~history (like those who bought bits of the Berlin Wall). Concrete should never be so wet that it flows~~ into the ~~forms like tomato soup~~. ~~How wet the~~ concrete ~~is. S2 is wet (for foundations). You can also use commercial products meant specifically for removing oil and grease from concrete. Sealing~~ with a ~~commercial sealer and painting floors are two important tasks that complement~~ the ~~concrete cleaning and pressure cleaning process~~. ~~List two industrial uses for nonmetallic mineral resources? The word mineral~~ is ~~a concrete noun, a word for a physical thing. Supplementary cementitious materials are~~ the ~~mineral admixtures consisting~~ of ~~powdered or pulverized materials which are added to~~ [http://~~www~~.~~dict~~.cc/~~englisch-deutsch/concrete.html concrete~~] ~~before or during mixing~~ to ~~improve or change some of the plastic or hardened properties of Portland cement concrete. There are~~ a ~~180 8x8x8 concrete blocks per pallet~~. How many ~~8x8x8 concrete blocks per pallet<br><br>Another great feature of composite materials is that they are non~~-~~conductive to electricity~~. ~~Listed above are some major features~~ and benefits of composite materials and why steel should be replaced by them to achieve sustainability and additional constructional benefits. This article will help you in answering the question ‘why steel must be replaced with composite materials in order to gain structural sustainability? Although the question of branding has always been ~~essential~~ part of ~~marketing~~ and ~~has been approached with multi-dimension models, sometimes these studies have been made without systematic approach or with full of redundancy or ad-hoc views~~. ~~First off, you have to make sure that the floor of your garage is free~~ from ~~all types of dust~~ and ~~dirt~~ that ~~could settle into~~ the ~~paint as it dries~~. ~~We also provide a variety~~ of ~~free online services~~ to ~~help students study abroad. Producing goods~~ or ~~services: Operations and production management is responsible for developing and producing goods and services that the company can sell~~<br><br>~~Other important industries are clothing manufacture, printing~~ and ~~publishing, sugar~~ and ~~oil refining~~, ~~food processing, brewing~~ and ~~distilling~~, ~~and~~ the ~~manufacture of chemical, glass, leather, paper, rubber~~, and ~~plastic products~~. 1. ~~A mixture of coarse~~ and ~~fine aggregates (~~sand~~, gravel, stones, larger bits of crushed rock, recycled glass, bits of old recycled~~ concrete~~, and pretty much anything equivalent)—typically 60-75 percent. 2. Cement (~~the ~~everyday name~~ for ~~calcium silicates~~ and ~~aluminates)—typically 10-15 percent~~. ~~Thrown together~~ and ~~mixed well, these simple ingredients make~~ a ~~composite~~, ~~which~~ is ~~the name we give~~ to ~~a hybrid material that's better in some important way than the materials from which it's made~~. ~~Thinking of concrete as a composite material~~, ~~the cement hydrate is the background, binding material (technically called the "matrix") to which the sand~~ and ~~gravel add extra strength (the "reinforcement")~~. ~~Although it sometimes gets~~ a ~~bad press, because many people associate it with brutal urban architecture from the mid-20th century, concrete is the great, unsung hero~~ of the ~~modern, material world. For many people this is sufficient due~~ to ~~the type~~ of ~~content they are looking to support: apps~~	+	That would be STAM, the Ghent City Museum, where you can get an overview of the rich history of Ghent. Ghent a very walkable city and the local tourism board goes above and beyond to make sure visitors have all of the information and resources needed to make the most out of their time. These have now been transformed into a multi-purpose space where you can check out the art or just hang out. So far 54 artworks are officially part of the Concrete Canvas tour showcasing street art in Ghent, which you can follow either on foot or by bike. Recently we visited the hugely underrated Belgian city Ghent, situated just some three hours by train from Amsterdam, a perfect weekend destination for those who like culture, good food and… street art, as we recently discovered. A mix of sand and gravel, a cement binder and water, concrete is so widely embraced by architects, structural engineers, developers and builders because it is a remarkably good construction material<br><br>Just like interior, polished concrete floors there are many color options available. Whether you’re remodeling existing concrete floors or pouring concrete for new construction, we’ll provide decorative concrete tools and materials. Instead, it's far in reality common in garages, pavements, driveways, and different varieties of [https://www.sportsblog.com/search?search=outdoors%20floors outdoors floors] as a substitute, even as laminate flooring, vinyl floors, hardwood floors, and ceramic tiles are used for the interior. If you adored this short article and you would certainly like to get even more info relating to [http://stamped-concrete-border-d93579.educationalimpactblog.com/13728100/stamped-concrete-bow-nh-no-further-a-mystery Stamped Concrete Rye NH] kindly browse through our own internet site. Far from being just an experiment, EDCC cement is a commercial-ready product that has been designated as an official retrofit option in British Columbia, Canada. Our number one goal in residential and commercial applications is to provide the best possible installation by being the most informative and knowledgeable installers in the paver industry. The theodolite is also being produced and is intended for measuring angles both by standard and autocollimation methods, in industry when mounting elements and constructions of machines and mechanisms, for building industrial constructions and other purposes<br><br>Shot blasting can open the surface more than intended and leave deeper grooves where the blasting overlaps so it is not ideal for home applications. Unsealed concrete requires extra effort to remove the stain from the surface. Not only does the production of Portland cement involve quarrying - causing airborne pollution in the form of dust - it also requires the use of massive kilns, which require large amounts of energy. The newly-established Global Cement and Concrete Association (GCCA), currently representing about 35% of the world's cement production capacity and with a focus on sustainable development, was at COP24. The GCCA is due to publish a set of sustainability guidelines, which its membership will have to follow. Typically a gas pump will last between 300 - 3000 hours, depending on the quality of the unit. I actually wanted to do this tour when I was visiting Ghent last week, but I’d planned so many other things as well that in the end I simply didn’t have time left. As General and Engineering Contractors we have the possibilities of taking part in the development of complete projects from start to finish. But with Chinese consumption now appearing to level off, most future growth in construction is expected to happen in the emerging markets of South East Asia and sub-Saharan Africa - driven by rapid urbanisation and economic development<br><br>To merge the Guided Blinding Light of Destiny into the Brilliant Blinding Light of Destiny you will need 10 undead slayer badges. Wet concrete surfaces need to be floated with a bull float before the bleed water comes up to the surface. Concrete is the second most consumed product in the world after water! Run of the mill campaigns usually incorporate a [http://browse.deviantart.com/?q=strong%20message strong message] to buy a specific product. How many pages does Blinding - novel - have? Blinding - novel - has 1132 pages. For over eight decades we have produced ready-mix concrete and have been a part of the local community on both a business and social level. They can be built from scratch using wood and there are usually several local companies that can build the ramp for you. A lot of people who are doing this with their concrete to try get it as close as possible to look like marble or wood floors<br><br>The compensator on the vertical circle allows to make rapid and accurate measurements. The axis configuration is identical and comprises the vertical axis, the tilting axis and line of sight . Christmas vacation, so the airport was pretty full--mostly families standing in line at the ticket counters, kids arguing and parents labeling luggage. Throughout the game you'll acquire different "brushes." There will be roughly 50 in total, spread across five different colors. Remove any debris from the area and spread some masonry sand over the surface. Permaflow permeable concrete provides the optimal solution for surface and storm water management. This flexibility and control can be achieved through a mechanism, where speed of water jet is controlled remotely to effectively handle all possible situations. 1 The basic properties are unsurpassed range, speed and accuracy of measurements. Or have a low speed torrenting? The salaries of these countries are low and have the ability to produce large quantities of products at extremely low cost

DustinHolmwood0: Página creada con 'More on that lower below. Looking to be able to raise and lower water level in the dam quickly, I built a gate. Heres a .gif I found on the web showing how the gate on the dam w...'

2020-02-06T16:26:28Z

Página creada con 'More on that lower below. Looking to be able to raise and lower water level in the dam quickly, I built a gate. Heres a .gif I found on the web showing how the gate on the dam w...'

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More on that lower below. Looking to be able to raise and lower water level in the dam quickly, I built a gate. Heres a .gif I found on the web showing how the gate on the dam works. The dam so far is a single log lined with plastic tarp, filled in with rocks, gravel and sand. Because of the success of this I am going to add the same to the down stream slope of the dam as well soon. It works good but I need to add some kind of sealing strip to control leaking. They may also be used in backyards, to add to a new favorite room to relax, entertain, and cook. Sometimes the work may be suspended because of the weather. We are a small family owned business, which gives us the opportunity to work one-on-one with each client. If you adored this post and you would certainly such as to receive additional info relating to [http://stampedconcretebackyardpa57912.collectblogs.com/19733723/an-unbiased-view-of-decorative-concrete-bristol-nh Decorative Concrete Wolfeboro NH] kindly check out our web-page. Pile foundations are generally used for large structures. Various offshore structural companies provides drafting and design services for various type of structures like residential, commercial, institutional, industrial and special mega structures like sky scrapers, tunnels and bridges. For example, if the independent key were shaped like a square, there would be an undercut (or draft, negative angle) and the blocks couldn’t be assembled The critical chi-square value is read from the statistical table at () degrees of freedom. The observed chi-square value is calculated using , where , , and are as previously defined. The value of ranges from 0 to 1 regardless of the number of rankings. The RII was calculated using the formulawhere is the weights given to each variable by the respondents, ranging from 1 to 5, is the highest weight (i.e., 5 in the study), and is the total number of samples. Table 6 shows agreement by professions on the advantages of using precast concretewhere is the mean of ranking and "" is the number of advantages being ranked. Using Relative Important Index, Table 5 revealed that professionals consider low life cycle cost the main advantage of using precast concrete products and space for acoustic insulation as the least. Construction professionals prefer the use of precast concrete construction mainly because of low life cycle cost, reduction of on-site waste, speed of construction, and quality of work done Not many can say they own fragments of history (like those who bought bits of the Berlin Wall). Concrete should never be so wet that it flows into the forms like tomato soup. How wet the concrete is. S2 is wet (for foundations). You can also use commercial products meant specifically for removing oil and grease from concrete. Sealing with a commercial sealer and painting floors are two important tasks that complement the concrete cleaning and pressure cleaning process. List two industrial uses for nonmetallic mineral resources? The word mineral is a concrete noun, a word for a physical thing. Supplementary cementitious materials are the mineral admixtures consisting of powdered or pulverized materials which are added to [http://www.dict.cc/englisch-deutsch/concrete.html concrete] before or during mixing to improve or change some of the plastic or hardened properties of Portland cement concrete. There are a 180 8x8x8 concrete blocks per pallet. How many 8x8x8 concrete blocks per pallet Another great feature of composite materials is that they are non-conductive to electricity. Listed above are some major features and benefits of composite materials and why steel should be replaced by them to achieve sustainability and additional constructional benefits. This article will help you in answering the question ‘why steel must be replaced with composite materials in order to gain structural sustainability? Although the question of branding has always been essential part of marketing and has been approached with multi-dimension models, sometimes these studies have been made without systematic approach or with full of redundancy or ad-hoc views. First off, you have to make sure that the floor of your garage is free from all types of dust and dirt that could settle into the paint as it dries. We also provide a variety of free online services to help students study abroad. Producing goods or services: Operations and production management is responsible for developing and producing goods and services that the company can sell Other important industries are clothing manufacture, printing and publishing, sugar and oil refining, food processing, brewing and distilling, and the manufacture of chemical, glass, leather, paper, rubber, and plastic products. 1. A mixture of coarse and fine aggregates (sand, gravel, stones, larger bits of crushed rock, recycled glass, bits of old recycled concrete, and pretty much anything equivalent)—typically 60-75 percent. 2. Cement (the everyday name for calcium silicates and aluminates)—typically 10-15 percent. Thrown together and mixed well, these simple ingredients make a composite, which is the name we give to a hybrid material that's better in some important way than the materials from which it's made. Thinking of concrete as a composite material, the cement hydrate is the background, binding material (technically called the "matrix") to which the sand and gravel add extra strength (the "reinforcement"). Although it sometimes gets a bad press, because many people associate it with brutal urban architecture from the mid-20th century, concrete is the great, unsung hero of the modern, material world. For many people this is sufficient due to the type of content they are looking to support: apps