煅烧改性硅藻土基干混砂浆的制备及性能研究  

Research on the Preparation and Properties of Calcined Modified Diatomite Based Dry-mixed Mortar

作　　者：刘东升[1] 黄谦 王朝强 Liu Dongsheng;Huang Qian;Wang Chaoqiang(School of Chemistry and Chemical Engineering/Collaborative Innovation Center for Green Development in Wuling Mountain Areas,Yangtze Normal University,Chongqing 408100;;School of Civil and Architectural Engineering,Yangtze Normal University,Chongqing 408100;Chongqing Fulin Environmental Protection Center for Shale Gas Technology&Development,Chongqing 400800;Chongqing Environmental Protection Engineering Technology Center for Shale Gas Development,Chongqing 408000)

机构地区：[1]长江师范学院化学化工学院/武陵山片区绿色发展协同创新中心,重庆408100 [2]长江师范学院土木建筑工程学院,重庆408100 [3]重庆市涪陵页岩气环保研发与技术服务中心,重庆408000 [4]重庆市页岩气开发环境保护工程技术研究中心,重庆408000

出　　处：《非金属矿》2018年第5期41-44,共4页Non-Metallic Mines

基　　金：重庆市科委项目(cstc2017shmsA90012);重庆市教委项目(KJ15012026)

摘　　要：探讨了硅藻土替代部分水泥作为掺合料使用来制备干混砂浆的可行性。在用水量和砂不变的前提下,分别将原状硅藻土等质量(0、4%、8%、12%、16%、20%、24%、28%、32%、36%和40%)替代水泥,研究砂浆的流动度、抗折及抗压强度。基于此结果,将硅藻土分别按750℃、900℃及1 050℃3种焙烧制度进行煅烧,再将煅烧改性硅藻土等质量替代水泥。结果表明:750~1 050℃煅烧后,硅藻土逐渐失去多孔结构,黏土矿物在750℃失去羟基水,火山灰活性降低,1 050℃时,硅藻土基本失去多孔结构,火山灰活性最低,900℃煅烧时硅藻土的火山灰活性最高,此时改性后硅藻土替代12%水泥后的28 d砂浆抗压强度可达50.8 MPa,比纯水泥砂浆强度还高,且其他物理性能也较优良。The feasibility of using diatomite instead of some cement as admixture to prepare dry mortar was discussed.Raw diatomite was used at 0,4%,8%,12%,16%,20%,24%,28%,32%,36%and 40%replacement by weight for cement while sand and water quantities were kept constant.Compressive and flexural strength,fluidity of the mortars were determined.Base on that result,the diatomite was sintered at temperatures of 750℃,900℃,1 050℃respectively and replaced cement in the same quantity as that of raw one.The results indicated that porous structure gradually loses in diatomite during this sintering temperature range.Layered structure of clay minerals was destroyed as a result of removal of water,which leads to a 1ower pozzolanic activity.Calcined at 1 050℃,diatomite basic loss of porous structure which leaded to a 1owest pozzolanic activity.At 900℃,diatomite had a highest pozzolanic activity.In addition,the modified diatomite replace 12%cement’s 28 d compressive strength of mortars was above 50.8 MPa,which higher than the pure cement mortar strength,and other physical properties were excellent.

关 键 词：水泥 硅藻土 煅烧改性 干混砂浆 

分 类 号：TU521.3[建筑科学—建筑技术科学]