Repeatability of concrete rebound hardness using comprehensive statistical analysis

Q1 Chemical Engineering
Hemraj R. Kumavat, Narayan R. Chandak
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引用次数: 2

Abstract

The reliability of the result significantly affects the use of the Coefficient of Variation (within the test variation), which reflects the variability of the concrete properties rather than the standard deviation. For the estimation of reliability and precision, comprehensive statistical analysis (within test variation) is conducted on 534 test samples using a rebound hammer. Different standards, like BIS, EN, ACI, and ASTM, are used in this study to compare the test results. Empirical research revealed that there are contradictions in literature as well as the standards used in many countries. The present paper focuses on detailed investigations of uncertainty measurements of the surface hardness test by statistical parameters (range of rebound index, standard deviation, and Coefficient of Variation). The unbiased estimate of the variability parameters from the published results has been verified concerning to the European standard. Concrete parameters namely cement type, water to cement ratio, compaction deficiency, curing condition, and elevated temperature have an impact on the output of the rebound hardness in terms of the variability of the compressive strength. Based on the results, the authors are willing to propose amendments to the Indian code graciously in compliance with the variability of the rebound hammer.

综合统计分析混凝土回弹硬度的重复性
结果的可靠性显著影响变异系数(在试验变异范围内)的使用,变异系数反映了混凝土性能的变异性,而不是标准偏差。为了估计可靠性和精度,使用回弹锤对534个试样进行了综合统计分析(在试验变化范围内)。本研究使用了BIS、EN、ACI和ASTM等不同标准来比较测试结果。实证研究表明,许多国家的文献和标准都存在矛盾。本文重点研究了用统计参数(回弹指数范围、标准偏差和变异系数)测量表面硬度的不确定度。已根据欧洲标准对公布结果中的变异性参数的无偏估计进行了验证。混凝土参数,即水泥类型、水灰比、压实度不足、养护条件和高温,都会影响抗压强度变异性方面的回弹硬度输出。根据研究结果,作者愿意根据回弹锤的可变性,优雅地提出对印度法典的修正案。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of King Saud University, Engineering Sciences
Journal of King Saud University, Engineering Sciences Chemical Engineering-Fluid Flow and Transfer Processes
CiteScore
12.10
自引率
0.00%
发文量
87
审稿时长
63 days
期刊介绍: Journal of King Saud University - Engineering Sciences (JKSUES) is a peer-reviewed journal published quarterly. It is hosted and published by Elsevier B.V. on behalf of King Saud University. JKSUES is devoted to a wide range of sub-fields in the Engineering Sciences and JKSUES welcome articles of interdisciplinary nature.
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