Hydrothermal Solidification of Diatomite and Its Heat Insulating Property  

作　　者：TONG Yu1,GAO Jian1,XIA Feng1,XU Dawei2,SONG Lili3,YANG Wenrui1,ZENG You1(1.School of Materials Science and Engineering,Shenyang Jianzhu University,Shenyang,China,110168 2.China Construction Sixth Engineering Division Co.,Ltd.,Tianjin,China,300451 3.Beijing Division,Jiangsu Zheng He Tat Hong Equipment Rental Co.,Ltd.,Beijing,China,100102) 

出　　处：《沈阳建筑大学学报（自然科学版）》2012年第1期110-115,共6页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家自然科学基金项目(90606008);辽宁省教育厅科学项目计划(L2010446),辽宁省教育厅重点实验室项目(LS2010128)

摘　　要：To meet the commercial requirements of inorganic heat insulators,the mixture of diatomite and Ca(OH)2 are evenly dispersed,mold-compacted,and then hydrothermally solidified due to the formation of tobermorite under an autoclaved process.Systematic investigations of the preparation conditions(including mix ratio,autoclaved factors,mold pressure,etc)were carried out to optimize the serving properties of such tobermorite-based products.As a result,a compressive strength of more than 30 MPa was realized for the specimen in high density(about 1.30(g·cm-3)).On the contrary,the specimen in light weight for example 0.63(g·cm-3)typically showed a thermal conductivity of around 0.12(W·m-1·K-1).The present work developed a feasible way to produce and to control the serving properties of diatomite-based heat insulators by a process of hydrothermal solidification,in which the optimized value of Ca/Si ratio was proposed to be 0.6~0.7,while the water content is 25% in weight,and hydrothermal reaction is performed at 180 ℃ for no more than 24 hours.To meet the commercial requirements of inorganic heat insulators,the mixture of diatomite and Ca（OH）2 are evenly dispersed,mold-compacted,and then hydrothermally solidified due to the formation of tobermorite under an autoclaved process.Systematic investigations of the preparation conditions（including mix ratio,autoclaved factors,mold pressure,etc）were carried out to optimize the serving properties of such tobermorite-based products.As a result,a compressive strength of more than 30 MPa was realized for the specimen in high density（about 1.30（g·cm-3））.On the contrary,the specimen in light weight for example 0.63（g·cm-3）typically showed a thermal conductivity of around 0.12（W·m-1·K-1）.The present work developed a feasible way to produce and to control the serving properties of diatomite-based heat insulators by a process of hydrothermal solidification,in which the optimized value of Ca/Si ratio was proposed to be 0.6~0.7,while the water content is 25% in weight,and hydrothermal reaction is performed at 180 ℃ for no more than 24 hours.

关 键 词：DIATOMITE TOBERMORITE heat insulation hydrothermal solidification 

分 类 号：TU522[建筑科学—建筑技术科学]