多孔陶粒对超高性能混凝土的性能影响  

Influence of porous ceramsite on the performance of ultra-high performance concrete

作　　者：尹天一 王志宇 余睿 曾敏 胡方杰 水中和 蒋春园 钟嘉铭 王武峰 YIN Tianyi;WANG Zhiyu;YU Rui;ZENG Min;HU Fangjie;SHUI Zhonghe;JIANG Chunyuan;ZHONG Jiaming;WANG Wufeng(State Key Laboratory of Silicate Materials for Architectures,Wuhan 430070,China;International School of Materials Science and Engineering,Wuhan University of Technology,Wuhan 430070,China;School of Materials Science and Engineering,Wuhan University of Technology,Wuhan 430070,China;China Railway Construction Bridge Design and Research Branch,Wuhan 430063,China;China Railway Construction Laboratory of Bridge Engineering,Wuhan 430063,China;Wuhan University of Technology Advanced Engineering Technology Research Institute of Zhong Shan City,Zhongshan 528400,China)

机构地区：[1]硅酸盐建筑材料国家重点实验室,湖北武汉430070 [2]武汉理工大学材料科学与工程国际化示范学院,湖北武汉430070 [3]武汉理工大学材料科学与工程学院,湖北武汉430070 [4]中铁建大桥设计研究院,湖北武汉430063 [5]中国铁建股份有限公司桥梁工程实验室,湖北武汉430063 [6]中山市武汉理工大学先进工程技术研究院,广东中山528400

出　　处：《混凝土》2022年第9期137-140,148,共5页Concrete

基　　金：中央高校基本科研业务费资助(206859007);中山市武汉理工大学先进工程技术研究院开放课题(WUT202004)。

摘　　要：通过采用修正后的Andreasen-Andersen模型,将破碎细化后的多孔陶粒筛分成粒径分布在0.6~1.25 mm的骨料,等体积取代同粒径分布的河砂来制备超高性能混凝土。参照相关测试标准对其工作性能与力学性能进行了测试,同时设计落球试验对其抗冲击性能进行测试,并采用扫描电子显微镜对其断面进行了形貌分析。其中试块的抗压强度并未因陶粒的引入出现明显下滑,且28 d强度均超过120 MPa;当陶粒取代全部体积同粒径河砂时,试块的抗冲击性能相对标准组有了明显提升,且试块的抗冲击强度与陶粒替代同粒径河砂的体积分数呈正相关;而在SEM图中可观测到陶粒的多孔吸水结构,并在孔内部及周围观察到丰富的水化产物,在陶粒周围形成壳状的内养护区。The modified Andreasen Andersen model is used to divide the broken and refined porous ceramsite sieve into aggregates with particle size distribution of 0.6~1.25 mm,and equal volume is used to replace the same size distribution of river sand to prepare ultra-high performance concrete.According to the relevant test standards,its working performance and mechanical properties were tested.At the same time,its impact resistance was tested by ball drop test,and its cross-section morphology was analyzed by scanning electron microscope.The compressive strength of the test block did not decline significantly due to the introduction of ceramsite,and the 28 d compressive strength was more than 120 MPa.When ceramsite replaces all the river sand with the same volume and size,the impact resistance of the test block is obviously improved compared with the standard group,and the impact strength of the test block is positively correlated with the volume fraction of ceramsite replacing river sand with the same grain size.While the porous water absorption structure of ceramsite was observed in the SEM,and abundant hydration products were observed in and around the pores,and the shape of water around the ceramsite was obvious shell shaped inner curing area.

关 键 词：多孔陶粒 超高性能混凝土 抗冲击性能 内养护 

分 类 号：TU528.2[建筑科学—建筑技术科学]