掺料对陶粒混凝土强度及微观结构影响分析  

The influence of admixtures on the compressive strength and microstructure of ceramsite concrete

作　　者：卜长明 杨海燕 陆鑫宇 朱冬旭 孙毅 钟永力 李妍 BU Changming;YANG Haiyan;LU Xinyu;ZHU Dongxu;SUN Yi;ZHONG Yongli;LI Yan(State Key Laboratory of Bridge Engineering Structural Dynamics and Key Laboratory of Bridge Earthquake Resistance Technology,400067 Chongqing,China;Chongqing University of Science and Technology,School of Civil and Hydraulic Engineering,401331 Chongqing,China;Chongging Key Laboratory of Disaster Prevention and Reduction in Power Transmission Engineering,401331 Chongqing,China)

机构地区：[1]桥梁工程结构动力学国家重点实验室暨桥梁结构抗震技术交通行业重点实验室,重庆400067 [2]重庆科技大学土木与水利工程学院,重庆401331 [3]输变电工程防灾减灾重庆市重点实验室,重庆401331

出　　处：《应用力学学报》2025年第1期125-132,共8页Chinese Journal of Applied Mechanics

基　　金：国家自然科学基金青年项目(No.52008070);重庆市自然科学基金项目(No.cstc2021jcyj-msxmX0444);重庆市建设科技计划项目(No.城科字2021第1-6);重庆市教委科学技术研究项目(No.KJQN201801503);重庆市教委科学技术研究项目(No.KJZD-K202201503);桥梁工程结构动力学国家重点实验室暨桥梁结构抗震技术交通行业重点实验室开放基金。

摘　　要：粉煤灰和石膏粉复合掺入陶粒混凝土是一种新型材料,可以达到废渣利用、减少污染、提高强度等目的,为节能环保做出贡献。通过改变粉煤灰和石膏粉掺量的配合比,进行多龄期抗压强度试验,分析石膏粉掺量对掺粉煤灰陶粒混凝土抗压强度的影响,并结合扫描电子显微镜(scanning electron microscope,SEM)技术,对微观结构进行分析。结果表明:当粉煤灰掺量为40%时,试样抗压强度随着石膏粉的掺量增加呈先上升后下降的趋势,石膏粉掺量为22%,试样抗压强度达到最大;22%的石膏粉和40%的粉煤灰复掺可以提高其抗压强度,使其微观结构更加紧密,对强度有利的水化产物较多,反之微观结构变得蓬松,其水化产物减少;强度较高的试样界面过渡区(interface transition zone,ITZ)更加紧密。Ceramsite concrete with fly ash and gypsum powder is a new kind of materials,which can achieve the purpose of waste residue utilization,reduce pollution,improve strength,and make contribution to energy conservation and environmental protection.In this paper,through changing the mix proportion of fly ash and gypsum powder,the multi-age compressive strength F-040-G-000 is carried out to analyze the influence of fly ash and gypsum powder on the compressive strength of ceramsite concrete,and combined with the scanning electron microscope(SEM)technology,the microstructure is analyzed.The results show that when the content of fly ash is 40%,the compressive strength of the specimen first increases and then decreases with the increase of the content of gypsum powder.When the content of gypsum powder is 22%,the compressive strength of the specimen reaches the maximum.Appropriate amounts of gypsum powder and fly ash can improve the later compressive strength,make its microstructure more compact,and more hydration products are beneficial to the strength,on the contrary,the microstructure is better;the interface transition zone(ITZ)of the F-040-G-000 block with higher strength is more compact.

关 键 词：陶粒混凝土 粉煤灰 石膏粉 龄期 抗压强度 微观分析 

分 类 号：X7[环境科学与工程—环境工程]