内养护与补缩剂复合对高性能混凝土的减缩效果

M. Meddah, Masahiro Suzuki, R. Sato
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引用次数: 3

摘要

本文介绍了内固化多孔骨料(IC)的引水剂如何成为高性能混凝土(HPC)的重要组成部分。本文介绍了一项正在进行的研究项目的部分实验结果,该项目是关于多孔陶瓷废骨料“PorCera”(PC)作为高性能结构混凝土元件的IC剂的有效性。已有研究证实了预浸再生多孔陶瓷粗骨料(PCCA)作为IC和收缩补偿剂在降低高性能混凝土自收缩方面的有效性。本研究的主要目的是研究收缩补偿剂和PorCera的组合对硅灰高性能混凝土行为的协同效应。这种混合固化技术包括减缩剂(SRA)、膨胀添加剂(EA)和再生PC提供的内部固化的组合。研究了其对抗压和劈裂抗拉强度、自收缩和内部自应力的影响。结果表明,采用这种混合固化体系制成的HPC混合料显著降低了自收缩量,从而降低了诱导内应力,比单一加入收缩补偿剂的性能要好得多。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Shrinkage Reducing Effect of a Combination of Internal Curing and Shrinkage Compensating Agents on High-Performance Concrete
This paper describes how water entraining agent using porous aggregate known as internal curing (IC) has become an important component of high-performance concrete (HPC). This paper presents part of the experimental results of an on-going research project regarding the effectiveness of porous ceramic waste aggregates called ‘PorCera’ (PC) as IC agent for high-performance structural concrete elements. Previous studies have proven the effectiveness of both the presoaked recycled porous ceramic coarse aggregate (PCCA) as an IC and shrinkage compensating agents in reducing autogenous shrinkage of HPC. The main purpose of this study is to investigate the synergistic effect of a combination of shrinkage compensating agents and the PorCera on silica fume HPC behavior. This hybrid curing technique includes a combination of shrinkage reducing agent (SRA), expansive additive (EA), and internal curing provided by the recycled PC. Its effect on compressive and split tensile strengths, autogenous shrinkage, and internal self-stress were investigated. Results indicate that HPC mixtures made with this hybrid curing system drastically reduce the amount of autogenous shrinkage, and consequently the induced internal stress and perform much better than the single incorporation of shrinkage compensating agents.
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