Study on the suitability of rice straw and silicate cement

Abstract

In order to study the feasibility of preparing cement particle board by compounding silicate and rice straw shavings, this paper explored their compatibility by detecting the heat of hydration of both by HPLC and characterized by FTIR, SEM and XRD. The results suggested that rice straw contained a certain amount of sugars soluble in water as well as organic carboxylic acids, having toxic effects on the hydration of silicate cement and could retard the hydration reaction of silicate cement. The addition of rice straw would inhibit the generation of crystals of hydration products in the early stage of silicate cement hydration, which makes it difficult for the C-S-H gel to build a dense spatial mesh, resulting in the poor compatibility of rice straw with silicate cement. The verification experiments exhibited that the static flexural strength of straw cement particleboard was far lower than the standard value of CB/T 24312–2009 cement particleboard, indicating that rice straw was unsuitable for direct apply for the preparation of rice straw silicate cement particleboard, and the compatibility regulation of rice straw and silicate cement was required.