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首页> 外文会议>Symposium on masonry >Compressive Strength Testing of Concrete Paving Units: Research on Configuration of Tested Specimens and Effects of Variables in Specimen Capping
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Compressive Strength Testing of Concrete Paving Units: Research on Configuration of Tested Specimens and Effects of Variables in Specimen Capping

机译：混凝土摊铺单元的抗压强度测试：被测样件的构型和试件顶盖变量的影响研究

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摘要

Concrete paving units are governed by ASTM C936/C936M, Standard Specification Solid Interlocking Concrete Paving Units. Regardless of size or configuration, these units are required to have a minimum average compressive strength of 55 MPa (8000 psi). This strength was originally established when ASTM C936 was first approved in 1982 based on concrete paving units having a thickness of 60 mm (2.36 in.) and a thickness/width aspect ratio of approximately 0.6. Prior to August 2012, the compressive strength testing procedures in ASTM C140, Standard Test Methods for Sampling and Testing Concrete Masonry Units and Related Units, did not include consideration for the configuration of the tested specimen. This produced results that could vary solely due to specimen configuration. Because of the proliferation of shapes and sizes of manufactured concrete paving units in recent years, research was conducted to determine the effect of specimen configuration on compressive strength. The research indicates that the aspect ratio of tested specimens affects the measured strength. The results were used to support revisions to the testing procedures to standardize the compressive strength specimen configuration and institute an "aspect ratio factor" used in calculating compressive strength. A separate research project evaluated the effect of variables in capping of compression test specimens. Capping is essential for providing consistent . bearing surfaces for strength testing; however, the type of material and the thickness of the cap were found to have significant effects on strength. The results were used to justify limiting the capping material for pavers to high-strength gypsum, and limiting the cap thickness to 1.5 mm (0.06 in.). This paper reviews both projects and the changes to ASTM C140 based on the results. In addition, this paper presents a useful guide for testing laboratories so that they can readily understand and comply with the new compressive strength testing requirements.
机译：混凝土摊铺机受ASTM C936 / C936M（标准规格固体互锁混凝土摊铺机）的约束。无论尺寸或配置如何，这些单元都必须具有55 MPa（8000 psi）的最小平均抗压强度。该强度最初是在1982年ASTM C936首次使用厚度为60毫米（2.36英寸）且厚度/宽度纵横比约为0.6的混凝土摊铺机时确定的。在2012年8月之前，ASTM C140（混凝土砌体单元和相关单元的抽样和测试的标准测试方法）中的抗压强度测试程序未考虑测试样品的配置。产生的结果可能仅因样本配置而异。由于近年来制造的混凝土摊铺单元的形状和尺寸激增，因此进行了研究以确定标本构型对抗压强度的影响。研究表明，测试样品的长宽比会影响测得的强度。结果用于支持对测试程序的修订，以标准化抗压强度样本的配置并建立用于计算抗压强度的“长宽比”。一个单独的研究项目评估了变量对压缩测试样品封盖的影响。封顶对于提供一致的至关重要。用于强度测试的轴承表面;然而，发现材料的类型和盖的厚度对强度有显着影响。结果用于证明将摊铺机的封盖材料限制为高强度石膏，以及将封盖厚度限制为1.5 mm（0.06英寸）是合理的。本文对两个项目以及基于结果的ASTM C140所做的更改进行了回顾。此外，本文还为测试实验室提供了有用的指南，使他们可以轻松理解并遵守新的抗压强度测试要求。

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