Monthly Archive:: July 2012
Bulk density of aggregates is the mass of aggregates required to fill the container of a unit volume after aggregates are batched based on volume. It depends on the packing of aggregate i.e. Either loosely packed aggregates or well dense …
Specific heat is the heat capacity of a material that it absorbs to raise the temperature by one degree Celsius. In case of concrete, it is the heat capacity of concrete. Specific heat is measured in joules per kg per …
Thermal diffusivity is used for the calculation of thermal conductivity. It represents the rate at which temperature changes within a defined mass. It is represented by δ and it is measured in meter square per hour. Thermal diffusivity is like …
Thermal conductivity is the ability of the material to absorb heat. It can also be defined as the ratio between the heat flux and the temperature gradient. Unit of thermal conductivity is joules per second per square meter. Conductivity of …
In thermal curing heat is applied to the concrete for the purpose of accelerating the gain of early concrete strength. There are several thermal curing methods that can be used, but each method has some specialized properties that make it …
There are many empirical equations have been developed for finding the maximum width of cracks. These equations were based on the statistical analysis of experimental result data. In ACI code, two expressions have been mentioned. The two expressions were developed …
If the loads are sustained for longer duration than initial deflections increased very prominently because of the two major affects i.e., creep and shrinkage. These two effects are considered as combined in most of the cases during the calculation of …
Shrinkage in concrete produces a compressive stress in the longitudinal reinforcement of beams and slabs. Tensile stress crops in response to balance the compressive stress. Usually, reinforcements are not placed symmetrically to the concrete centroid. And if the same in …
Elastic deflections are the immediate deflections that occur only once during service period. It is not a time function i.e., there is no specific time when immediate deflections come into action. Mathematically immediate deflections can be expressed as; …
Compressive strength of concrete is affected very prominently by the strength of aggregate, its moisture content, grading, surface texture and the maximum aggregate size. For the making of high strength concrete, aggregates like quartzite, trap rock or felsite are required …