超低温环境下双掺粉煤灰及硅灰对砂浆力学性能的影响  

The effect of double-doped fly ash and silica fume on the mechanical properties of mortar under ultra-low temperature environment

作　　者：孔萌萌 崔云鹏[1,2] 李洪斌 王一鹤 邓玉姣 KONG Mengmeng;CUI Yunpeng;LI Hongbin;WANG Yihe;DENG Yujiao(School of Material Science and Engineering,Shenyang Ligong University,Shenyang 110159,China;Liaoning Traffic Planning and Design Institute Co.Ltd.,Shenyang 110111,China;Xinen(Qingdao)Integrated Circuit Co.Ltd.,Qingdao 266500,China)

机构地区：[1]沈阳理工大学材料科学与工程学院,辽宁沈阳110159 [2]辽宁省交通规划设计院有限责任公司,辽宁沈阳110111 [3]芯恩(青岛)集成电路有限公司,山东青岛266500

出　　处：《新型建筑材料》2024年第9期30-34,共5页New Building Materials

摘　　要：研究了粉煤灰、硅灰2种矿物掺合料双掺在不同掺量下对超低温冻融循环(-190~20℃)后水泥砂浆抗压、抗折强度和抗冻性的影响规律。结果表明:在超低温冻融循环后,对水泥砂浆性能的劣化程度远大于低温冻融循环(-20~20℃);当粉煤灰掺量15%、硅灰掺量10%时,水泥砂浆力学性能最优,10次超低温冻融循环后,抗折、抗压强度分别达到10.06、38.29 MPa;此时水泥砂浆强度的损失率最低,抗冻性最好;孔径达到最小为33.15 nm,孔隙率也是最小,为13.58%。In this paper,the influence of fly ash and silica fume on the compressive strength,flexural strength and frost resistance of cement mortar after ultra-low temperature freeze-thaw cycle(-190~20℃)was studied under different dosage of fly ash and silica fume.The results show that the deterioration degree of cement mortar after ultra-low temperature freeze-thaw cycle is much greater than that of low temperature freeze-thaw cycle(-20~20℃).Among them,when the double-doped fly ash is mixed with 15%and the silica fume is mixed with 10%,the mechanical performance of cement mortar is the best.After 10 super-low temperature freeze-thaw cycle,the flexural strength and compressive strength reach 10.06 MPa and 38.29 MPa respectively.At this time,the loss rate of cement mortar strength is the lowest and the frost resistance is the best;the pore size reaches a minimum of 33.15 nm,and the porosity is also a minimum of 13.58%.

关 键 词：超低温冻融循环 矿物掺合料 水泥砂浆 强度损失 抗冻性 孔隙结构 

分 类 号：TU526[建筑科学—建筑技术科学]