微集料增强粉煤灰泡沫混凝土配合比试验  

Experiment on mix ratio of fly ash foamed concretereinforced by micro aggregate

作　　者：郝贠洪[1,2,3] 孙浩 秦立达 邬卓轩 慈天义 郭晓梅 HAO Yunhong;SUN Hao;QIN Lida;WU Zhuoxuan;CI Tianyi;GUO Xiaomei(School of Civil Engineering,Inner Mongolia University of Technology,Hohhot 010051,China;Graduate school,Inner Mongolia University of Technology,Hohhot 010051,China;Engineering Technology Research Center for Building Inspection,Appraisal and Safety Evaluation,Inner Mongolia Autonomous Region,Hohhot 010051,China;China XinXing Construction Engineering Co.,Ltd,Beijing 100009)

机构地区：[1]内蒙古工业大学土木工程学院,呼和浩特010051 [2]内蒙古自治区土木工程结构与力学重点实验室,呼和浩特010051 [3]内蒙古自治区建筑检测鉴定与安全评估工程技术研究中心,呼和浩特010051 [4]中国新兴建筑工程有限责任公司,北京100009

出　　处：《功能材料》2022年第10期10229-10236,共8页Journal of Functional Materials

基　　金：国家自然科学基金项目(51468049,11162011);国家杰出青年科学基金项目(50725416);内蒙古自然科学基金面上项目(2018MS05047);内蒙古科技计划项目(关键技术攻关项目);内蒙古草原英才项目(107-841025);内蒙古高校青年科技英才支持计划(NJYT-17-A09)。

摘　　要：以水泥、粉煤灰、石英粉和石英砂为原材料,H_(2)O_(2)溶液为发泡剂,采用化学发泡的方法制备密度等级为A12的泡沫混凝土。通过单因素试验确定水胶比、粉煤灰掺量、微集料掺量的适宜范围,设计正交试验优化材料配比,并利用极差法分析各因素对材料抗压强度、抗折强度和导热系数的影响,建立其基本力学性能与主要影响因素的关系模型,最后采用扫描电子显微镜(SEM)观察不同微集料掺量的粉煤灰泡沫混凝土微观形貌,分析材料强度提升的原因。结果表明:微集料增强粉煤灰泡沫混凝土配比适宜的范围为水胶比0.4~0.5、粉煤灰掺量30%~50%、微集料掺量60%~80%。微集料增强粉煤灰泡沫混凝土3d抗压强度影响因素的主次关系为:水胶比>粉煤灰掺量>微集料掺量>聚丙稀纤维掺量>减水剂掺量;7与28d抗压强度影响因素主次关系均为:水胶比>微集料掺量>粉煤灰掺量>聚丙稀纤维掺量>减水剂掺量;28d抗折强度影响因素主次关系为:水胶比>粉煤灰掺量>聚丙稀纤维掺量>微集料掺量>减水剂掺量;导热系数影响因素主次关系为:水胶比>粉煤灰掺量>微集料掺量>减水剂掺量>聚丙烯纤维掺量。优化配比为水胶比0.5,粉煤灰掺量40%,微集料掺量70%,聚丙稀纤维掺量0.1%,减水剂掺量0.8%,28d抗压强度、抗折强度和导热系数分别为19.05 MPa、2.66MPa和0.3615W/(m·K)。With cement,fly ash,quartz powder and quartz sand as raw materials and H_(2)O_(2) solution as foaming agent,the foamed concrete with density grade A12 was prepared by adopting the method of chemical foaming.First,the favourable arrange of water to binder ratio,fly ash replacement as well as micro-aggregate amount of admixture was found by single factor experiment.At the same time,we designed the orthogonal test optimization of the materials proportion,and made use of Range Method to analyze the effects on material compressive strength,rupture strength and heat conductivity coefficient caused by various factors to establish the relation model between its basic mechanical properties and main influence factors.Finally,we adopted scanning electron microscope(SEM)to observe the micro-structure of fly ash with different micro-aggregate amount of admixture,analyzing the reason for increasing material strength.The experiment results showed that the appropriate range for the micro-aggregate to increase fly ash foamed concrete ratio were water to binder ratio of 0.4-0.5,fly ash replacement of 30%-50%and micro-aggregate replacement of 60%-80%,respectively.The primary and secondary relationship of influencing factors for the micro-aggregate to increase fly ash foamed concrete 3 d compressive strength was water to binder ratio>fly ash replacement>micro-aggregate replacement>MP-I replacement>water reducing agent replacement.The primary and secondary relationship of 7 d and 28 d compressive strength was water to binder ratio>micro-aggregate replacement>fly ash replacement>MP-I replacement>water reducing agent replacement.The primary and secondary relationship of 28d breaking strength was water to binder ratio>fly ash replacement>MP-I replacement>micro-aggregate replacement>water reducing agent replacement.The primary and secondary relationship of heat conductivity coefficient was water to binder ratio>fly ash replacement>micro-aggregate replacement>water reducing agent replacement>MP-I replacement.The optimum mixture ratio were

关 键 词：粉煤灰 泡沫混凝土 正交试验 抗压强度 导热系数 

分 类 号：TU528.2[建筑科学—建筑技术科学]