The Effect of Mineral Pigments on Mechanical Properties of Concrete

Amr El Nemr, M. A. Shawky, M. E. El Khafif
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Abstract

 Pigmented concrete exhibits artesian properties in addition to ordinary concrete properties, explicitly high strength, excellent durability, and weather resistance. However, the influence of several parameters that affect the characteristics of colored concrete should be studied; extensively. In this paper, the impact of the w/b (water/binder) ratio using color pigments on the mechanical properties such as compressive and flexural strengths of colored cement mortar prisms and cubes experimentally investigated. The experimental program included 21 mixes with six cubes and three flexural prisms specimens for assessing compressive and flexural strength, respectively. The blends included different water/binder ratios with values of 0.4, 0.5, and 0.6, in addition to several color pigments as a partial replacement of cement. The percentage of replacements altered between 0, 2.5%, 5% and 7.5% with two different shades of pigments consisting of red iron and green chromium oxide. Based on the experimental results, empirical expressions were generated based on Abram’s law to assess the relationship between the compressive strength of colored concrete and w/b ratio. The results revealed that the compressive and flexural strength of colored concrete is influenced by w/b ratio and partially replacement percentage of cement by color pigment not proportionally direct. Furthermore, the shade of pigments also has a different impact as well.
矿物颜料对混凝土力学性能的影响
除了普通混凝土的性能外,色素混凝土还具有自流性能,明显具有高强度、优异的耐久性和耐候性。但是,对影响彩色混凝土性能的几个参数的影响还需要进行研究;广泛。本文通过实验研究了彩色颜料w/b(水胶比)对彩色水泥砂浆的抗压强度和抗折强度等力学性能的影响。实验程序包括21种混合材料,其中包括6个立方体和3个弯曲棱镜试件,分别用于评估抗压和抗折强度。共混物包括不同的水/胶比(值为0.4、0.5和0.6),以及几种颜色颜料作为水泥的部分替代品。由红色铁和绿色氧化铬组成的两种不同色调的颜料的替代百分比在0,2.5%,5%和7.5%之间变化。根据试验结果,基于Abram定律生成了彩色混凝土抗压强度与w/b比关系的经验表达式。结果表明:彩色混凝土的抗压强度和抗弯强度受w/b比和水泥部分替代率的影响,但影响程度不成正比。此外,颜料的颜色也有不同的影响。
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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