Preparation and Properties of Masonry Mortar from Spontaneous Combustion Coal Gangue

IF 0.8 4区 材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Materials Science-medziagotyra Pub Date : 2023-08-16 DOI:10.5755/j02.ms.31843
Wenqing Meng, Xin Liu, Shenglei Feng, Hanlong Cui, Yapeng Zhang
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Abstract

To solve the problem of gangue stockpiling, this paper intends to study the feasibility of preparing masonry mortar based on spontaneous combustion gangue. After crushing the spontaneous combustion gangue, the gangue below 4.75 mm was selected, and substituted manufactured sand to prepare masonry mortar in equal quantity. The single factor test method was used to select the replacement rate of spontaneous combustion gangue, water-binder ratio (W/B) and water reducer dosage as variables to explore their effects on the basic properties of fresh mortar mixtures, such as fluidity, apparent density and water retention of fresh mortar, and the mechanical properties of hardened mortar. The anti-frost resistance of gangue mortar was evaluated by a freezing-thawing cycle test. SPSS.20 software was used for variance analysis, and the results showed that the replacement rate of spontaneous combustion gangue, W/B and water reducer dosage on mechanical properties of mortar differences are significant (P < 0.001). With the increase of the replacement rate of spontaneous combustion gangue, the mortar strength decreases, and with the rise of W/B, the mortar strength raises first and then reduces, while with the increase of the water reducer dosage, the mortar strength increases first and then decreases. Spontaneous combustion gangue mortar shows better anti-frost resistance under the freezing-thawing cycle. After 50 freezing-thawing cycles, the maximum mass and strength loss rate of mortar specimens are 2.4 % and 12.67 %, respectively. When the replacement rate of spontaneous combustion coal gangue is 100 %, the mechanical properties and anti-frost resistance of mortar both meet the requirements of the standard and realize the maximum utilization of gangue waste resources. This paper aims to provide theoretical support for the application of spontaneous combustion gangue in masonry mortar.
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自燃煤矸石砌筑砂浆的制备及性能研究
为了解决煤矸石的堆存问题,本文研究了以自燃煤矸石为原料制备砌筑砂浆的可行性。将自燃脉石破碎后,选用4.75mm以下的脉石,用人工砂替代等量砌筑砂浆。采用单因素试验法,选取自燃脉石的替代率、水胶比(W/B)和减水剂用量为变量,探讨它们对新拌砂浆的流动性、表观密度、保水性等基本性能以及硬化砂浆的力学性能的影响。通过冻融循环试验对脉石砂浆的抗冻性进行了评价。采用SPSS.20软件进行方差分析,结果表明,自燃脉石的替代率、W/B和减水剂用量对砂浆力学性能的影响差异显著(P<0.001),砂浆强度先升高后降低,随着减水剂用量的增加,砂浆强度先增加后降低。自燃脉石砂浆在冻融循环下表现出较好的抗冻性。经过50次冻融循环后,砂浆试件的最大质量损失率和强度损失率分别为2.4%和12.67%。当自燃煤矸石的替代率为100%时,砂浆的力学性能和抗冻性均满足标准要求,实现了矸石废弃物资源的最大化利用。本文旨在为自燃脉石在砌筑砂浆中的应用提供理论支持。
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来源期刊
Materials Science-medziagotyra
Materials Science-medziagotyra 工程技术-材料科学:综合
CiteScore
1.70
自引率
10.00%
发文量
92
审稿时长
6-12 weeks
期刊介绍: It covers the fields of materials science concerning with the traditional engineering materials as well as advanced materials and technologies aiming at the implementation and industry applications. The variety of materials under consideration, contributes to the cooperation of scientists working in applied physics, chemistry, materials science and different fields of engineering.
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