Do you need to remove the ads? Get the paid membership
Join TheConstructor to ask questions, answer questions, write articles, and connect with other people. When you join you get additional benefits.
Log in to TheConstructor to ask questions, answer people’s questions, write articles & connect with other people. When you join you get additional benefits.
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Why cubes are tested at 3, 7 and 28 days for the Compressive Test?
Getu B.
Concrete compressive tests are usually done at 1,3,7,14 and 28 days. Most important of these days (usually) is the 28th day strength, in which it is expected to gain 99% full strength. Early and intermediate results, i.e for 1,3,7,14 days, in which the concrete will gain its 16%,40%,65% and 90% strRead more
Concrete compressive tests are usually done at 1,3,7,14 and 28 days. Most important of these days (usually) is the 28th day strength, in which it is expected to gain 99% full strength. Early and intermediate results, i.e for 1,3,7,14 days, in which the concrete will gain its 16%,40%,65% and 90% strength respectively, are also important to predict the 28th day strength and to schedule our construction works ahead so that we will not wait until the concrete gains its full strength. For example, if the concrete test results fail at the 3 or 7 days we should take an action and we should not wait until the 28th day strength. There are also areas like post-pensioning works where we need intermediate results to schedule sequential stressing of tendons.
See lessWhat is negative pore water pressure in soil?
Getu B.
There are two types of pore water pressures in soil, positive and negative. Soil existing below the ground water table is saturated, and pressure in the pore is greater than atmospheric pressure and hence we have positive pore water pressure. Above groundwater table, we have unsaturated soil and preRead more
There are two types of pore water pressures in soil, positive and negative. Soil existing below the ground water table is saturated, and pressure in the pore is greater than atmospheric pressure and hence we have positive pore water pressure. Above groundwater table, we have unsaturated soil and pressure in the pore is less than atmospheric pressure. In this region, we have negative pore water pressure.
See less