Hand Mixing Of Concrete The process of mixing the various ingredients of concrete by manual labour, is called hand mixing of concrete. Hand mixing of concrete may be resorted to at small projects which require limited quantity of concrete. Now-a-days machine mixing of concrete i...
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Tagged As: Concrete
Guniting or Shotcrete Guniting or Shotcrete: An intimate mixture of cement, sand (or fine aggregate) and water is forced or ejected through a cement-gun and shot into place by means of compressed air. The usual equipment consists of a compressor, spray nozzle and flexible hose pi...
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Tagged As: Concrete
Cold Weather Concreting During Cold weather concreting, the rate of hardening and setting of concrete is very much retarded when the temperature falls below 21 deg. C. (70 deg. F.). At about 10 deg. C. (50 deg. F.) the action of setting slows down to about one-half of what it is ...
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Hot Weather Concreting Hot Weather Concreting in tropical countries, such as India, air temperatures may rise up to 40-50 deg. C. during summer months. Such temperatures combined with high wind velocity and/or low humidity enhance the rate of evaporation of the water, increase th...
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Tagged As: Concrete
Concrete Shrinkage - Shrinkage of Concrete Concrete shrinks during setting and drying due to hydration of cement and produces shrinkage cracks. The drying shrinkage increases with an increase in cement content or an increase in water content. Shrinkage is greater with riche...
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Tagged As: Concrete, Concrete Shrinkage
Slump Cone Test and its Advantages - Limitations Although, the slump cone test is not entirely satisfactory since it gives widely varying results and also does not give a true measure of workability but it is of value in the field as a control test and is useful in comparin...
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Tagged As: Concrete, Slump Cone Test
Concrete Bleeding - Bleeding of Concrete Concrete bleeding is the appearance of a watery scum (also called laitance) on the surface of a concrete after compaction. It is- an indication that there is too much water or deficiency of fine material in the mix, or that too much ...
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Tagged As: Concrete
Concrete Segregation - Segregation of Concrete It is the separating of the coarse aggregate from the rest of the mix or the separating of the cement-water paste from the aggregate. Segregation generally indicates poor aggregate grading or mix design. Segregation may occur i...
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Sea Water for Mixing Concrete It is advisable, as stated above, to use clean water fit for drinking purposes for making cement concrete. However, at places where sea water is available in abundance and potable water is costly, the sea water can be used for making cement concrete....
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High Density Concrete High density concrete is a concrete having a density in the range of 6000 to 6400 kg/cu.m. High density concrete is also known as Heavy weight concrete. High density concrete is mainly used for the purpose of radiation shielding, for counterweights and oth...
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