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

Abstract

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

CLC Number:

TU528.53

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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