锂渣基多固废掺和料力学性能及水化机理研究  

Study on Mechanical Properties and Hydration Mechanism of Lithium Slag Based Solid Waste Admixture

作　　者：张延年[1] 李云凯 林吉森 张祥坤 韩成龙 杨长鹏 Zhang Yannian;Li Yunkai;Lin Jisen;Zhang Xiangkun;Han Chenglong;Yang Changpeng(School of Civil Engineering,Shenyang Jianzhu University,Shenyang,Liaoning 110168;China Railway Construction Bridge Engineering Bureau Group Fourth Engineering Co.,Ltd.,Harbin,Heilongjiang 150056)

机构地区：[1]沈阳建筑大学土木工程学院,辽宁沈阳110168 [2]中铁建大桥工程局集团第四工程有限公司,黑龙江哈尔滨150056

出　　处：《非金属矿》2023年第6期78-81,共4页Non-Metallic Mines

基　　金：国家自然科学基金重点项目(52234004);沈阳市科技计划项目(22-322-3-04)。

摘　　要：为实现工业固废利用,降低水泥使用量,以锂渣为主要掺和料,复掺自燃煤矸石、钢渣部分替代水泥制备复合胶凝材料,研究掺和料配比和水泥替代率对水泥砂浆力学性能及微观结构的影响。结果表明,当复合掺和料中锂渣、自燃煤矸石和钢渣比例为4∶1∶1时,28 d抗压强度达到51.98 MPa,替代30%水泥后期抗压强度较25%掺量下降较小。微观结果表明,掺入掺和料未改变水化产物类型,主要为水化硅酸钙、氢氧化钙和钙钒石;复合掺和料中活性组分SiO_(2)、Al_(2)O_(3)与Ca(OH)_(2)发生二次水化反应,生成更多水化硅酸钙与钙钒石,协同水化,促进强度提升。In order to achieve the utilization of industrial solid waste and reduce cement usage,lithium slag is used as the main admixture,and self igniting coal gangue and steel slag are partially substituted for cement to prepare composite cementitious materials.The effects of admixture ratio and cement replacement rate on the mechanical properties and microstructure of cement mortar are studied.The results show that when the ratio of lithium slag,spontaneous combustion coal gangue,and steel slag in the composite admixture is 4∶1∶1,the compressive strength at 28 d reaches 51.98 MPa,and the later compressive strength of replacing 30%cement does not decrease significantly compared to the 25%dosage.The microscopic results show that the admixtures do not change the type of hydration products,mainly calcium silicate hydrate,calcium hydroxide and vanadite;The active components SiO_(2)and Al_(2)O_(3)in the composite admixture undergo a secondary hydration reaction with Ca(OH)_(2),generating more hydrated calcium silicate and calcium vanadate,which synergistically hydrate and promote the improvement of strength.

关 键 词：锂渣 自燃煤矸石 钢渣 掺和料 力学性能 微观结构 

分 类 号：TU525[建筑科学—建筑技术科学] X75[环境科学与工程—环境工程]