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经处理再生骨料制备的砂浆碳化行为：磷酸二铵的影响

Carbonation Behavior of Mortar Made from Treated Recycled Aggregates: Influence of Diammonium Phosphate.

作者信息

Gómez-Cano Diana, Arias-Jaramillo Yhan P, Bernal-Correa Roberto, Tobón Jorge I

机构信息

Department of Construction, School of Architecture, Universidad Nacional de Colombia, Medellín 050034, Colombia.

Orinoquia Institute of Studies, Universidad Nacional de Colombia, Arauca, Colombia.

出版信息

Materials (Basel). 2023 Jan 20;16(3):980. doi: 10.3390/ma16030980.

DOI:10.3390/ma16030980
PMID:36769987
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9918259/
Abstract

This research aims to improve the quality of recycled concrete fine aggregates (RFA) by using diammonium hydrogen phosphate (DAP). We aimed to understand the effect of DAP treatment on durability performance due to the carbonation action of mortars with the partial and total substitution of treated RFA. The results showed a maximum reduction in the RFA water absorption of up to 33% using a minimum DAP concentration due to a pore refinement as a consequence of the formation of calcium phosphates such as hydroxyapatite (HAP). The carbonation phenomenon did not have a significant effect on the durability of mortars with DAP-treated RFA, as we did not find a decrease in the compressive strength; the carbonation depth of the mortars with 100% treated RFA decreased up to 90% and 63% for a w/c of 0.45 and 0.50, in comparison with mortars with 0% treated RFA. An inversely proportional relationship was found between the accelerate carbonation and the compressive strength, showing that higher percentages of treated RFAs in the mortar promoted an increase in compressive strength and a decrease in the carbonation rate, which is behavior associated with a lower permeability of the cement matrix as one of the consequences of the microstructural densification by DAP treatment.

摘要

本研究旨在通过使用磷酸氢二铵（DAP）来提高再生混凝土细骨料（RFA）的质量。我们旨在了解DAP处理对部分和全部替代经处理RFA的砂浆碳化作用下耐久性性能的影响。结果表明，由于形成了诸如羟基磷灰石（HAP）等磷酸钙导致孔隙细化，使用最低DAP浓度时，RFA吸水率最多可降低33%。碳化现象对经DAP处理的RFA砂浆的耐久性没有显著影响，因为我们未发现抗压强度降低；与未处理RFA含量为0%的砂浆相比，对于水灰比为0.45和0.50的情况，100%经处理RFA的砂浆碳化深度分别降低了90%和63%。在加速碳化和抗压强度之间发现了反比关系，表明砂浆中经处理RFA的比例越高，抗压强度增加且碳化速率降低，这是由于DAP处理使微观结构致密化导致水泥基体渗透性降低的结果之一。

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Properties of Concrete Prepared with Recycled Aggregates Treated by Bio-Deposition Adding Oxygen Release Compound.添加释氧化合物的生物沉积处理再生骨料制备的混凝土性能
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Towards sustainable concrete.迈向可持续混凝土。
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