Proportions and Strength of Concrete

Introduction of catalog ..................................................................................................................................................................................................................... ... 6 Cement ... 7 Curing 7 Workability 8 Test ..................................... ... ............................ .... ..... 9-11 Conclusion .................................... ... ... .......................................... .. 12 10. References. ............................................... ........................................ ............................................................. .................................................... ................................. ...................................................... ....................................................... ... .......................... ................................................. .................................................... ............................................... ......................................... ......... ... ... ... ... Specific technology has been improved since long ago, but still still Hyundai Construction Project - From the foundation to the nuclear power plant of a huge building with our city skyscraper, to the garage and patio floor, r

Mixing: - The process of mixing various concrete components in a specific ratio is called concrete mixing. Mixing Target: The quality and strength of concrete varies with proper mixing. The purpose of mixing is to apply all aggregate particles to the surface using cement slurry to obtain concrete of uniform color and desired consistency. Manual mixing: - The process of manually mixing the concrete ingredients is called manual mixing. It is suitable for small but not important, and the amount of concrete used is small. Manual mixing requires more cement (10%) than a machine to obtain the same strength of concrete.

Ordinary concrete (ordinary concrete): - The use of nominal concrete mixture and determination of cement, aggregate and water ratio without preliminary testing is commonly called concrete. It is used only when controlled concrete can not be used. If mixed concrete is not designed for any reason, it can be used at M20 or less. The proportion of ingredients is specified by the engineer and is not normally tested. There is no guarantee that the proportional M20 nominal mixture (eg 1: 4: 8) will have a cubic strength of 20 N / mm 2 on the 28th.

The physical properties of concrete density and strength depend to a certain extent on the ratio of three important factors, water, cement and aggregate. You can choose a proportional component based on quantity or weight. The volume ratio is not very accurate, but this may be the preferred method due to the limitation of class time. The basic mixture of mortar can be made using volume ratio of 1 water: 2 cement: 3 sand. Most student activities can be carried out with this basic mixture. Another "old rule of thumb" for mixed concrete is 1 cement: 2 sand: 3 gravel. Mix the dry ingredients and slowly add water until concrete can be used. This mixture may need to be modified according to the concrete aggregate used to provide correct processability. Mixtures should not be too hard or too loose. If it is too hard, it will be difficult to make good samples.