煅烧凝灰岩对水泥水化产物和硬化体孔结构的影响  

Effect of Calcined Trass on the Hydrates of Cement and Pore Structure of Hardened Paste

作　　者：胡亚茹[1] 杜永康 杨少锋 邓洋 陈延信[1] HU Yaru;DU Yongkang;YANG Shaofeng;DENG Yang;CHEN Yanxin(College of Materials Science and Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China;Shaanxi Building Materials Technology Group Co.,Ltd.,Xi’an 710018,China;Shaanxi Fuping Eco-cement Co.,Ltd.,Weinan 711709,China)

机构地区：[1]西安建筑科技大学材料科学与工程学院,陕西西安710055 [2]陕西建材科技集团股份有限公司,陕西西安710018 [3]陕西富平生态水泥有限公司,陕西渭南711709

出　　处：《建筑材料学报》2024年第1期67-75,共9页Journal of Building Materials

基　　金：陕西省科学技术研究计划项目(2022KXJ-008,2022GY-418,2021TD-53);陕西省教育厅重点研发计划项目(20JY040);榆林市科技计划项目(CXY-2020-057)。

摘　　要：为探明煅烧凝灰岩对水泥水化产物的影响,借助X射线衍射(XRD)、热重分析(TG)、傅里叶变换红外光谱(FTIR)等测试方法,分析了700℃下煅烧不同时间后凝灰岩的矿物组成及其对水泥水化产物和硬化体孔结构的影响.结果表明:煅烧后凝灰岩中的沸石水、结构水和吸附水被脱除,斜发沸石等沸石矿物架状结构发生破坏,形成无定形的SiO_(2)和Al_(2)O_(3);煅烧凝灰岩有助于水泥中的水化硅酸钙(C-S-H)、钙矾石(AFt)和单硫型水化硫铝酸钙(AFm)形成,且降低了C-S-H的钙硅比(n(Ca)/n(Si)),消耗了Ca(OH)_(2),水泥更易发生碳化;水化28 d后,煅烧凝灰岩水泥的孔隙率降低,孔径分布更细,从而提高了水泥强度.In order to understand the influence of calcined trass on the cement hydrates,the mineral composition change of trass calcined at 700℃for different time and its influence on hydrates were studied by means of X⁃ray diffraction(XRD),thermogravimetric analysis(TG),Fourier infrared spectroscopy(FTIR),et al.The results show that the zeolite water,structural water and adsorbed water in the trass are removed after calcination at 700℃,and the framework structure of zeolite minerals such as clinoptilolite is destroyed,forming amorphous SiO_(2) and Al_(2)O_(3).Calcined trass contributes to the formation of calcium silicate hydrates(C⁃S⁃H),ettringite(AFt)and single sulfur hydrated calcium sulfoaluminate(AFm)in cement,the reduction of the calcium⁃silicate ratio(n(Ca)/n(Si))of C⁃S⁃H,the consumption of Ca(OH)_(2),and cement hardened paste is more readily to carbonation.After 28 days of hydration,the porosity of cement hardened paste added with calcined trass reduces,and the pore size distribution is finer,thus the cement strength is improved.

关 键 词：煅烧凝灰岩 水化产物 早期水化 孔结构 

分 类 号：TQ172.41[化学工程—水泥工业]