压缩浇筑工艺对100%再生骨料混凝土吸水性能的影响

IF 1.4 4区工程技术

Revista de la Construccion Pub Date : 2022-01-01 DOI:10.7764/rdlc.21.2.387

R. Hameed, Zaib un-Nisa, M. Rizwan Riaz, S. A. Ali Gillani

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引用次数: 3

摘要

研究了压浇筑工艺对目标强度为11 ~ 15mpa的低标号100%再生骨料混凝土(RAC)吸水性能的影响。通过吸附率试验测定其吸水特性。再生骨料是通过破碎强度为21 ~ 28 MPa的实验室测试混凝土样品生产的。采用两种不同水泥掺量对粗骨料和细骨料的再生比例进行了研究。为了进行比较，还测试了天然骨料混凝土配合比。研究参数包括集料类型、浇筑压力、浇筑工艺和水泥掺量对RAC吸水性能的影响。在10% NaCl溶液中浸泡3个月后，用硝酸银溶液观察盐的渗透深度。吸附性能试验结果表明，压缩铸造工艺对低品位100% RAC的吸水性能有积极影响。此外，结果表明RAC混合料的吸水性能低于天然骨料混凝土混合料。根据初始吸水率和二次吸水率，提出了不同浇注压力和水泥掺量条件下100% RAC的吸水率预测公式。

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Effect of compression casting technique on the water absorption properties of concrete made using 100% recycled aggregates

Effect of compression casting technique on the water absorption characteristics of low grade 100% Recycled Aggregate Concrete (RAC) of target strength range 11 to 15 MPa to be used in the manufacturing of masonry units is investigated. Water absorption characteristics were determined by performing sorptivity test. Recycled aggregates were produced by crushing laboratory-tested concrete samples of strength ranging from 21 MPa to 28 MPa. Two different ratios of recycled coarse aggregate and recycled fine aggregates were investigated using two different cement contents. For comparison, natural aggregate concrete mixes were also tested. The study parameter included effect of aggregates type, casting pressure, casting technique and cement content on the water absorption properties of RAC. Further, depth of penetration of salt was observed using silver nitrate solution after 3-month immersion in 10% NaCl solution. The results of sorptivity test showed positive impact of compression casting technique on water absorption properties of low grade 100% RAC. Further, results showed that RAC mixes exhibited inferior water absorption properties compared to natural aggregates concrete mixes. Various equations were proposed to predict water absorption of 100% RAC under different conditions of casting pressure and cement content based on initial and secondary rate of water absorption.

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来源期刊

Revista de la Construccion 工程技术-工程：土木

CiteScore

2.30

自引率

21.40%

发文量

期刊介绍： The Journal of Construction is aimed at professionals, constructors, academics, researchers, companies, architects, engineers, and anyone who wishes to expand and update their knowledge about construction. We therefore invite all researchers, academics, and professionals to send their contributions for assessment and possible publication in this journal. The publications are free of publication charges. OBJECTIVES The objectives of the Journal of Construction are: 1. To disseminate new knowledge in all areas related to construction (Building, Civil Works, Materials, Business, Education, etc.). 2. To provide professionals in the area with material for discussion to refresh and update their knowledge. 3. To disseminate new applied technologies in construction nationally and internationally. 4. To provide national and foreign academics with an internationally endorsed medium in which to share their knowledge and debate the topics raised.