Relationship between nitrogen specific surface area and drying shrinkage of ordinary Portland cement paste

摘要

New findings of this research are as follow:1) Below 75% RH at 20 °C, the drying shrinkage strain of thecement paste increased with the starting ages of drying.This tendency became more clearly from 40% to 11% RHat 20 °C.2) The nitrogen surface area of the cement pastes at sealedcondition increased with the curing periods. In addition,this surface area and the drying shrinkage strain at 11%RH showed a linear relationship.