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Contrary to what many think, cement and concrete are not the same thing. Cement is actually an ingredient used in concrete.
Concrete is essentially made of cement, water, sand, and stone. Cement is a very fine powder made from limestone, sand, clay, and iron ore. In the correct proportions these ingredients are crushed and super-heated in a kiln to form “clinker”. The clinker is crushed again with the precise amount of gypsum and other ingredients. The result is a fine powder known as cement. Concrete’s strength comes from the reaction between water and the chemical compounds in cement referred to as hydration. The aggregates in concrete (sand and stone both coarse and fine) are for volume only and are not considered active ingredients in the hydration process.
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Unfortunately, there's no "antifreeze" for concrete. However, there are admixes that can be added to the mix to accelerate the set to compensate for cold temperatures. There are also admixes that can be used to slow the set for high temperatures. At hot or cold temperature extremes, special care must be taken to insure a quality product.
Concrete is generally a safe component and provides little to no danger. More precaution should be taken with the delivery and placement of concrete. To avoid risk, the following precautions should be taken:
Dispatch will want to know what mix design is required, how you intend to place it on the jobsite, the delivery address and time, approximately how long you will hold the truck, and any special instructions that are pertinent to your job (i.e.: Do you need expansion joint?, Does the concrete require Fibermesh?, Will this be colored concrete?, Will this be a C.O.D. order?, Do you have an account?)
There are many methods available to place concrete in less accessible areas. They range from direct placement from the chute on the truck (usually around 15 ft reach) to a wheelbarrow, to concrete pumps that can place concrete around obstacles several hundred feet away.