Performance of rice husk ash produced using a new technology as a mineral admixture in concrete

Effect of rice husk ash on the strength and durability characteristics of concrete

Rice-husk ash paste and concrete: Some aspects of hydration and the microstructure of the interfacial zone between the aggregate and paste

Handbook of thermal analysis of construction materials

Silica powder at nanoscale was obtained by heat treatment of Vietnamese rice husk following the sol–gel method. The rice husk ash (RHA) is synthesized using rice husk which was thermally treated at optimal condition at 600°C for 4 h. The silica from RHA was extracted using sodium hydroxide solution to produce a sodium silicate solution and then precipitated by adding H2SO4 at pH = 4 in the mixture of water/butanol with cationic presence. In order to identify the optimal condition for producing the homogenous silica nanoparticles, the effects of surfactant surface coverage, aging temperature, and aging time were investigated. By analysis of X-ray diffraction, scanning electron microscopy, and transmission electron microscopy, the silica product obtained was amorphous and the uniformity of the nanosized sample was observed at an average size of 3 nm, and the BET result showed that the highest specific surface of the sample was about 340 m2/g. The results obtained in the mentioned method prove that the rice husk from agricultural wastes can be used for the production of silica nanoparticles.

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Synthesis of silica nanoparticles from Vietnamese rice husk by sol–gel method

This paper describes how rice husk ash (RHA) was obtained under different burning conditions from 400 to 1200°C. The changes in the properties of the RHA were investigated using microanalytical techniques. When RHA obtained at different burning conditions was added to cement paste or mortar, several properties such as hydration, setting time, porosity, and strength revealed changes and these changes are described.

Dong-Sheng Wu

Papers

Properties of Cement Paste Containing Rice Husk Ash