基于流变参数多样本统计的自密实混凝土稳定性及均匀性分析方法

硅酸盐通报 ›› 2023, Vol. 42 ›› Issue (12): 4298-4308.

基于流变参数多样本统计的自密实混凝土稳定性及均匀性分析方法

韦强¹, 高强¹, 卢福洲¹, 陈亮胜¹, 陈犇², 赵国欣², 李静², 陈正²

1.广西路建工程集团有限公司,南宁 530001;
2.广西大学土木建筑工程学院,省部共建特色金属材料与组合结构全寿命安全国家重点实验室,南宁 530004

收稿日期:2023-07-11 修订日期:2023-09-15 出版日期:2023-12-15 发布日期:2023-12-12
通信作者: 陈正,博士,教授。E-mail:chenzheng@gxu.edu.cn
作者简介:韦强(1979—),男,高级工程师。主要从事桥梁试验与施工管理的工作。E-mail:1634261324@qq.com
基金资助:
国家重点研发计划(2021YFB2600903)

Analyzing Methods for Stability and Homogeneity of Self-Compacting Concrete Based on Rheological Parameters of Multiple Samples Statistics

WEI Qiang¹, GAO Qiang¹, LU Fuzhou¹, CHEN Liangsheng¹, CHEN Ben², ZHAO Guoxin², LI Jing², CHEN Zheng²

1. Guangxi Road Construction Engineering Group Co., Ltd., Nanning 530001, China;
2. State Key Laboratory of Featured Metal Materials and Life-Cycle Safety for Composite Structures, College of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China

Received:2023-07-11 Revised:2023-09-15 Online:2023-12-15 Published:2023-12-12

摘要/Abstract

摘要： 自密实混凝土具有流动性大、密实度高的特点,常被用于钢管混凝土等特殊工程结构,但其制备及施工过程极易受工程现场复杂因素影响,产生不可控的工作性能波动,目前缺乏基于流变学本质的分析控制指导方法。本文统计并分析了实际工程现场的混凝土流变参数,结果表明混凝土的流变参数在多样本条件下符合良好的对数正态分布。根据样本95%置信区间进行了整体混凝土稳定性分析,将$\bar{\tau}$_s0∈[194.75,225.76]∩$\bar{\mu}$∈[88.76,95.00]作为混凝土稳定性良好的判据;并结合混凝土在泵管内的流动形式对现场调整的混凝土的流变参数进行分析,讨论流变性能的调控方向,提出基于混凝土流变参数的可泵性区间(τ_s0=[54.17,391.76]∪μ=[52.77,126.66])和流变性能优化方法。基于现场统计的流变参数曲线特征,从本质上揭露了混凝土的内部均匀性特征,提出了现场施工的自密实混凝土均匀性判据,为自密实混凝土均匀性评价体系、流变性能调控、配合比设计提供理论依据。

关键词: 自密实混凝土, 均匀性, 稳定性, 流变参数, 施工质量控制, 多样本统计

Abstract: Self-compacting concrete with high fluidity and compactness is often used in the special engineering structures such as concrete-filled steel tubes. However, its preparation and construction process are highly susceptible to complex factors at the engineering site, resulting in uncontrollable fluctuations in its workability. There is still a lack of analytical control methods based on essence of rheology. This paper makes an analysis of the rheological parameters of concrete according to the data collected from actual engineering sites. The results show that the rheological parameters of concrete well conform to a log-normal distribution under multiple sample conditions. Besides, an analysis of the overall concrete stability was carried out according to the 95% confidence interval of the samples, using $\bar{\tau}$_s0∈[194.75,225.76]∩$\bar{\mu}$∈[88.76,95.00] as a criterion for good concrete stability, and the rheological parameters of concrete adjusted on site were analyzed along with the flow behavior of concrete in the pump pipe. The direction of rheological property regulation was discussed, and methods for optimizing pumpability ranges (τ_s0=[54.17,391.76]∪μ=[52.77,126.66]) and rheological parameters were proposed based on concrete rheological parameters. By revealing the inherent homogeneity of the concrete through the analysis of the characteristics of the rheological parameter curves, the paper proposed a criterion for the homogeneity evaluation of self-compacting concrete on site, providing a theoretical basis for the homogeneity evaluation, rheological property regulation and mix proportion design of self-compacting concrete.

Key words: self-compacting concrete, homogeneity, stability, rheological parameter, construction quality control, multiple sample statistics

中图分类号:

TU528.53

韦强, 高强, 卢福洲, 陈亮胜, 陈犇, 赵国欣, 李静, 陈正. 基于流变参数多样本统计的自密实混凝土稳定性及均匀性分析方法[J]. 硅酸盐通报, 2023, 42(12): 4298-4308.

WEI Qiang, GAO Qiang, LU Fuzhou, CHEN Liangsheng, CHEN Ben, ZHAO Guoxin, LI Jing, CHEN Zheng. Analyzing Methods for Stability and Homogeneity of Self-Compacting Concrete Based on Rheological Parameters of Multiple Samples Statistics[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(12): 4298-4308.

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