包含硫酸镁溶液处理再生骨料的自密实纤维混凝土试验研究

Experimental Study on Self Compacting Fibrous Concrete Comprising Magnesium Sulphate Solution Treated Recycled Aggregates.

作者信息

Kathirvel Parthiban, Murali Gunasekaran, Vatin Nikolai Ivanovich, Abid Sallal R

机构信息

School of Civil Engineering, SASTRA Deemed University, Thanjavur 613404, India.

Peter the Great St. Petersburg Polytechnic University, 195251 St. Petersburg, Russia.

出版信息

Materials (Basel). 2022 Jan 4;15(1):340. doi: 10.3390/ma15010340.

DOI:10.3390/ma15010340

PMID:35009486

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8746273/

Abstract

It appears that the awareness and intentions to use recycled concrete aggregate (RCA) in concrete are expanding over the globe. The production of self-compacting concrete (SCC) using RCA is an emerging field in the construction sector. However, the highly porous and absorptive nature of adhered mortar on RCA's surface leads to reduced concrete strength, which can be removed with the application of various techniques, such as acid treatment. This study investigated the effect of the partial replacement of silica fume by cement and natural aggregate (NA) by RCA with and without steel fibre. The used RCA was treated with magnesium sulphate solution. It was immersed in solutions with different concentrations of 10%, 15% and 20% and for different periods of 5, 10 and 15 days. Sixteen mixes were prepared, which were divided into six groups with or without 1% of steel fibre content. The fresh properties, compressive strength, split tensile strength and impact resistance were examined. The results revealed that the strengths of the mixes with 20% RCA were marginally better than those of the control mixes. The compressive strength and split tensile strength were reduced by 34% and 35% at 60% RCA content, respectively, as compared to the control mixes.

摘要

在全球范围内，使用再生混凝土骨料（RCA）配制混凝土的意识和意向似乎正在不断增强。利用RCA生产自密实混凝土（SCC）是建筑领域的一个新兴方向。然而，RCA表面附着的砂浆具有高度多孔性和吸水性，这会导致混凝土强度降低，而通过应用各种技术（如酸处理）可以去除这种砂浆。本研究调查了用水泥部分替代硅灰以及用RCA部分替代天然骨料（NA）（有或无钢纤维）的效果。所使用的RCA用硫酸镁溶液进行了处理。将其浸泡在浓度分别为10%、15%和20%的不同溶液中，并浸泡5天、10天和15天的不同时长。制备了16种混合料，分为六组，钢纤维含量分别为有或无1%。对新拌性能、抗压强度、劈裂抗拉强度和抗冲击性进行了检测。结果表明，含20%RCA的混合料强度略优于对照混合料。与对照混合料相比，RCA含量为60%时，抗压强度和劈裂抗拉强度分别降低了34%和35%。