PSMC is a waste material produced from pyrolysis of Sheet Molding Compound. The material consists of 35% fibreglass, 55% CaCO;It was found that PSMC increased the compressive strength, mitigated the ASR expansion and improved the sulphate resistance of cement mortar. All these improvements were largely due to the fibreglass content in the PSMC.;Ground fibreglass was found to be a very effective material to improve the properties of cement mortar. It increased the compressive strength, reduced long term drying shrinkage, mitigated the ASR expansion, improved sulphate resistance, decreased the freeze-thaw weight loss and greatly enhanced the salt scaling resistance of cement mortar. The influence of fly ash and condensed silica fume on the properties of cement mortar was found to be similar to that of ground fibreglass.;It was also found that the pore structure of cement mortars was greatly influenced by the mineral admixtures which possess pozzolanic properties. From a statistical analysis, it was concluded that the influence of mineral admixtures on the properties of cement mortar can be explained by their influence on three pore related factors. These factors are the porosity factor, the fine pore factor, and the permeability factor.
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