高寒高海拔地区碾压混凝土孔系定制设计研究  

Study on pores customized design in RCC in extremely cold and high altitude area

作　　者：杨华美[1,2] 何真[1] YANG Huamei HE Zhen(The State Key Laboratory of Water Resources and Hydropower Engineering, Wuhan University, Wuhan 430072, China The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China)

机构地区：[1]武汉大学水资源与水电工程科学国家重点实验室,湖北武汉430072 [2]武汉科技大学省部共建耐火与冶金国家重点实验室,湖北武汉430081

出　　处：《水利学报》2017年第2期217-225,共9页Journal of Hydraulic Engineering

基　　金：国家973项目(2013CB035901;2015CB655101)

摘　　要：由于粉煤灰含碳颗粒表面的化学特性对引气剂(AEA)分子的吸附作用,以及高海拔环境对气泡形成与稳定的影响,使得高寒地区高掺粉煤灰碾压混凝土的引气极为困难。本文基于改性吸水树脂(MAP)材料特性,提出了与碾压混凝土抗冻性能相匹配的定制造孔理论与设计方法,对比研究了不同引气或造孔材料对碾压混凝土性能的影响。当MAP掺量和粒径合适时,MAP在碾压混凝土中可形成对抗冻性能有利的孔系结构,显著提高碾压混凝土的抗冻性能和力学性能,实现MAP造孔半径和造孔量在碾压混凝土中的可控设计。The high adsorption of unburned carbon in fly ash to polar material such as air-entraining ad-mixture（AEA） could interfere the formation of air structure and its stability. In addition,the impact of en-vironmental pressure on air entrainment also results in reduction in the air content of concrete. Therefore,it is rather difficult to entrain air voids into high-volume fly ash roller compacted concrete especially inthe extremely cold and high altitude areas. This paper presents a study on the development of a new typeof modified absorbent polymer（MAP） to totally replace conventional air-entraining agent as anti-freezingagent for RCC. Based on MAP features,the method to design and customize the pores system matching upRCC freeze-thaw property was proposed. Comparative studies of influence of various air entrained materialsincluding MAP and AEA on performances of RCC were also carried out. When the MAP content and parti-cle size were appropriate, an effectiveness pores system was formed, contributing to significantly improvefreeze-thaw resistance with great increase in strength. Finally, to controllably design the pores radium andcontent created by MAPs in RCC was realized.

关 键 词：高寒高海拔 碾压混凝土 改性吸水树脂 定制造孔 抗冻性能 

分 类 号：TV642.2[水利工程—水利水电工程]