This article aimed to research the effect of organic silicon on the density, mechanical strength, water absorption, porosity, and crack resistance of cementitious construction materials. Modified cement mortar was prepared by adding different amounts of organic silicon into control cement mortar. Mechanical strength was evaluated using bending and compressive strength tests. Porosity was evaluated to assess the inner structure of cement mortar. Furthermore, the micromechanism of modified cement mortar and control cement mortar was explored using the nitrogen-absorption test and a Scanning Electron Microscope (SEM). Experimental results showed that for the organic silicon and mix design used in this article, the incorporation of organic silicon generally reduced the mechanical strength and density and increased the water absorption, porosity, and crack resistance. In addition, the analysis of the nitrogen-absorption test and SEM test revealed the modified mechanism and the connection between the macroscopic properties and micromechanism of modified cement mortar.
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