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1. The History of Concrete
2. Concrete - Materials
7. Mixture & Mixing
12. CURING AND PROTECTION
Concrete`s strength may also be affected by the addition of admixtures. Admixtures are substances other than the key ingredients or reinforcements which are added during the mixing process. Some admixtures add fluidity to concrete while requiring less water to be used. An example of an admixture which affects strength is superplasticizer. This makes concrete more workable or fluid without adding excess water. A list of some other admixtures and their functions is given below. Note that not all admixtures increase concrete strength. The selection and use of an admixture are based on the need of the concrete user, as shown in Table 3.
The cause which occurs
a) When it hardens being insufficient
b) Cement elegy it is big and at the time of concrete one where the slump is big
c) The placing when the speed is quick
d) The sectional length of the portion which is contiguous plentifully difference at the time of day
e) When with the hot season concrete the temperature of the concrete will be high together and the congelation is quick,
f) When the wind after the concrete placing is strong.