The effect of recycled concrete powder (RCP) from precast concrete plant on fresh and mechanical properties of cementitious pastes

IF 1.1 4区工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY

Materiales de Construccion Pub Date : 2023-11-03 DOI:10.3989/mc.2023.351923

Joaquin Humberto Aquino Rocha, Matheus Pimentel Tinoco, Romildo Dias Toledo Filho

引用次数: 1

Abstract

This study aims to evaluate the effect of RCP from a precast concrete plant on rheological and mechanical properties of cementitious pastes. In the study, Portland cement was replaced by RCP in 10, 20, and 30% (in mass). The hydration kinects of cement with RCP was studied through isothermal calorimetry. The fresh properties were assessed using mini-slump test and rotational rheometry. The mechanical properties were evaluated through compression tests and the microstruture was studied using Scanning Electron Microscopy. RCP reduces fluidity of the pastes, by increasing both yield stress and plastic viscosity. The addition of RCP accelerates the hydration of cement, while reducing the released heat. RCP also reduces the compressive strength and elastic modulus of the pastes. The use of RCP as partial substitute for cement is viable, due to its size distribution and specific surface area.

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预制混凝土厂再生混凝土粉(RCP)对水泥浆新鲜性能和力学性能的影响

本研究旨在评估预制混凝土厂的RCP对胶凝体流变学和力学性能的影响。在研究中，波特兰水泥被RCP替代了10%、20%和30%(质量)。采用等温量热法研究了含RCP水泥的水化机理。采用微坍落度试验和旋转流变法对其保鲜性能进行了评价。通过压缩试验对其力学性能进行了评价，并用扫描电镜对其微观组织进行了研究。RCP通过增加屈服应力和塑性粘度来降低膏体的流动性。RCP的加入加速了水泥的水化，同时减少了水泥的放热。RCP还降低了膏体的抗压强度和弹性模量。利用RCP作为水泥的部分替代品是可行的，因为它的尺寸分布和比表面积。

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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来源期刊

Materiales de Construccion 工程技术-材料科学：综合

CiteScore

3.20

自引率

9.50%

发文量

审稿时长

>12 weeks

期刊介绍： Materiales de Construcción is a quarterly, scientific Journal published in English, intended for researchers, plant technicians and other professionals engaged in the area of Construction, Materials Science and Technology. Scientific articles focus mainly on: - Physics and chemistry of the formation of cement and other binders. - Cement and concrete. Components (aggregate, admixtures, additions and similar). Behaviour and properties. - Durability and corrosion of other construction materials. - Restoration and conservation of the materials in heritage monuments. - Weathering and the deterioration of construction materials. - Use of industrial waste and by-products in construction. - Manufacture and properties of other construction materials, such as: gypsum/plaster, lime%2