What is the difference between concrete and cement?
The primary difference between concrete and cement is that concrete is a composite material made of water, aggregate and cement. Cement is a very fine powder made of limestone and other minerals that absorbs water and acts as a binder to hold concrete together. While cement is building material in itself, concrete cannot be made without cement. Two terms are often incorrectly used interchangeably, but specific and cement are significantly separate products.
cement
cement is made of limestone, calcium, silicon, iron and aluminum. This mixture is heated in large furnaces to approximately 2,700 ° F (1,482 ° C) to form a product known as the marl, which is roughly reminiscent of balls. It is ground to powder and adds plaster and creates a substance similar to gray flour known as cement. When water is added to the cement, it triggers a chemical process that allows it to harden.
Portland cement
There are many different types of cement, but the type most commonly used inThe design is Portland cement. Joseph Aspdin of Britain developed building materials in the 17th century, finding that adding clay to limestone and overheating the mixture allowed the resulting mixture to set anywhere. Portland cement is a type of hydraulic cement, which means that when the water is added a chemical reaction that does not depend on how much water is. This allows the cement to solidify underwater and remain strong even in wet conditions. Different types of hydraulic cement are primarily used in concrete and mortars.
concrete
Conversely, concrete is a brick material that uses cement to join with crushed stone, rock and sand, also called aggregate. Cement accounts for from 10% to 15% of the total weight of concrete; The exact proportions vary depending on the type of concrete design. Aggmegate and cement are thoroughly mixed with water that begins with a chemical reaction, causing the cement to harden and set. Before this happens, the concrete mixture can be poured into a mold to stiffen in a particular shape, be it abouta block or board.
The amount of time required to set the concrete partly depends on how much plaster is added to the mixture. This time it is possible to accelerate by adding calcium chloride or by slowing down the addition of sugar. These compounds work by affecting the development of hardening crystals that are formed as concrete sets. Concrete, which is exposed to frost and thawing conditions, may have added other chemicals to help prevent cracking.
Bett and cement ratios
The properties of the concrete depend a lot on the ratio of the unit to the cement to the water in the mixture. The water ratio to cement is the most important because too little water makes the work of the concrete mix, while too much weakens the final product. Thipometer S is expected with the following equation:
In this calculation, the ratio is the ratio, Q h2o is the amount of water in American gallons and w c is the weight of the cement in the pounds. For most applicationsThe ratio is at least 0.25, while values of 0.35 to 0.4 are typical. The aggregate is also important because it accounts for more than 60% concrete mixture - and in some cases up to 80%. Larger rocks require less concrete, which means that less water is needed and a stronger final product can be produced. The unit is also cheaper than cement, so a higher percentage can reduce costs. In general, a good unit has a combination of rocks of many different sizes, with a specific average and maximum size; These stones must be clean and durable and should not contain clay or other minerals that can absorb water. Concrete's High R.obsah Ock is very durable and is often used in pool pool, skyscrapers, metroch and lamp columns, as well as sidewalks, driveway and roads. Components in concrete and cement are among the most abundant on Earth and both can be recycled. However, cement production requires a large amount of energy because high temperatures and industry would be requiredl criticized for his contributions to the emissions of carbon dioxide.