Obtención de silicatos de calcio utilizando el método de precipitación controlada

Abstract

Calcium silicate hydrates are compounds of SiO 2 - CaO - H 2 O system. These materials are used to make lime-sand bricks concretes, or cellular concretes, lime-flint brices and as fillers in rubber, paint and plastic products industries, among others. Undoubtedly, the tobermoritas is the most interesting group given its important role in concrete hydration: hydrated calcium silicate (C - S- H) is the main concrete hydration product and its primary bounding phase. The hydrothermal method is the most frequently used in the synthesis of these materials. This work shows the synthesis of hydrated calcium silicates through the controlled precipitation method using silicon dioxide SiO 2 , as raw material obtained from rice husk. The physicochemical phenomena that occur during the calcium silicates synthesis process were analized. The crystalline phases of the final product when exposed to thermic treatments were studied as well using x-ray diffraction and Infrared spectroscopy.