冻融循环作用下粉煤灰砂浆的力学性能  

Mechanical properties of fly ash mortar under freeze-thaw cycles

作　　者：曹琛 郑山锁[2] 李雪青 CAO Chen;ZHENG Shansuo;LI Xueqing(College of Urban and Rural Planning and Architectural Engineering,Shangluo University,Shangluo 726000,China;School of Civil Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,China;Sinohtdro Bureau 3rd Co.Ltd.,Xi'an 710024,China;Shaanxi Jianghe Water Conservancy and Hydropower Civil Engineering Survey and Investigation and Design Co.Ltd.,Xi'an 710024,China)

机构地区：[1]商洛学院城乡规划与建筑工程学院,陕西商洛726000 [2]西安建筑科技大学土木工程学院,陕西西安710055 [3]中国水利水电第三工程局有限公司,陕西西安710024 [4]陕西江河水利水电土木勘测设计研究有限公司,陕西西安710024

出　　处：《化工科技》2023年第1期12-15,54,共5页Science & Technology in Chemical Industry

基　　金：国家重点研发计划课题项目(2019YFC1509302);陕西省重点研发计划项目(2021ZDLSF06-10);商洛学院博士科研启动项目(21SKY103)。

摘　　要：冻融大气环境下粉煤灰砂浆的力学性能对砖砌体结构具有重要的影响。在不同冻融循环次数作用下,通过改变粉煤灰掺量,研究粉煤灰砂浆试块的质量损失率、动弹性模量及抗压强度等指标的变化。结果表明,随着冻融循环次数的增加,不同粉煤灰掺量的砂浆试块质量均减小;冻融循环次数相同情况下,粉煤灰砂浆的动弹性模量比水泥砂浆的小,且随着粉煤灰掺量的增加,其动弹性模量降低的愈明显;各砂浆试块的抗压强度均随冻融循环次数的增加而降低,但掺入适量粉煤灰,有益于砂浆的抗压强度。The mechanical properties of fly ash mortar under freeze-thaw atmospheric environment have an important impact on brick masonry structure.Under the action of different freeze-thaw cycles,the change of the mass loss rate,dynamic elastic modulus and compressive strength of the fly ash mortar block was studied by changing the amount of fly ash.The results show that the quality of the fly ash mortar block with different fly ash content decreases with the increase of the number of freeze-thaw cycles.The dynamic elastic modulus of fly ash mortar is smaller than that of cement mortar,and with the increase of the amount of fly ash,the more obvious the dynamic modulus is reduced.The compressive strength of each mortar block decreases with the increase of the number of freeze-thaw cycles.However,the incorporation of an appropriate amount of fly ash is beneficial to the compressive strength of the mortar.

关 键 词：粉煤灰砂浆 冻融循环 动弹性模量 抗压强度 

分 类 号：TQ177.62[化学工程—硅酸盐工业]