Effects of different stone powder content and particle size on dry shrinkage properties of mortar
In the process of mining and processing limestone into machine-made sand,a large amount of waste limestone powder is produced.The stacking and removal of stone powder will cause waste of land resources and environmental pollution.The drying shrinkage of the mortar after replacing the cement with the same amount of stone powder was tested,and the effects of different stone powder contents and different stone powder particle sizes on the drying shrinkage of the mortar were studied.The test results show that the drying shrinkage value of concrete can be effectively reduced by using an appropriate amount of stone powder to replace cement when the stone powder replacement rate is greater than 15%,the dry shrinkage value of mortar increases continuously,and the best replacement rate of stone powder is 10%.Under different stone powder content,the drying shrinkage value of mortar with stone powder particle size of 800 mesh and 1 250 mesh is smaller,in engineering practice,the stone powder of these two particle sizes can be selected as the external dosage.
stone powderequivalent substitutionparticle sizemortardrying shrinkage
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