Effect of presence of paint in recycled aggregates on the leaching of pollutants

IF 7.4 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials Pub Date : 2025-05-24 DOI:10.1016/j.conbuildmat.2025.141904

Júlia Fonseca Colombo Andrade , Rodrigo Eduardo Córdoba , Valdir Schalch

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引用次数: 0

Abstract

This study investigated the influence of the presence of architectural paint in recycled aggregates on the leaching and solubilization of metals concerning evaluations of potential environmental risks. Recycled aggregates were prepared in laboratory and coated with three types of paints, namely, economy latex, premium latex, and water-based enamel in five distinct colors. Both the paints and aggregates were chemically characterized and the leachates and solubilized extracts were analyzed in NBR 10.005 and SPLP leaching tests and NBR 10.006 solubilization test. The results indicated the concentrations of lead in the paints were below the Brazilian regulatory limit (600 mg/kg), ranging from below the detection limit to 2.60 mg/kg. However, the leaching tests revealed all the samples, including those with no paint coating, exceeded the metal concentration limits established by SPLP test and NBR 10.006 solubilization test, particularly for aluminum, barium, cadmium, and lead. The pH of the extracts varied according to the type of paint – it was more acidic for enamel paints and more alkaline for premium latex paints. Electrical conductivity was higher in the extracts obtained from NBR 10.005 test due to the presence of sodium hydroxide in the leaching solution. Spearman correlation tests indicated no significant relationship between the chemical composition of the paints and the concentration of metals in the leachates or solubilized extracts (p-value > 0.05), suggesting leaching is influenced by complex factors.

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再生骨料中油漆的存在对污染物浸出的影响

本研究探讨了再生骨料中建筑涂料的存在对金属的浸出和溶解的影响，并对潜在的环境风险进行了评价。回收骨料在实验室中制备，并涂上三种不同颜色的涂料，即经济乳胶，优质乳胶和水性搪瓷。在NBR 10.005和SPLP浸出试验和NBR 10.006增溶试验中，对涂料和骨料进行了化学表征，并对浸出液和增溶提取物进行了分析。结果表明，涂料中的铅浓度低于巴西监管限值（600 mg/kg），范围从低于检测限值到2.60 mg/kg。然而，浸出测试显示，所有样品，包括那些没有油漆涂层的样品，都超过了SPLP测试和NBR 10.006增溶测试确定的金属浓度限值，特别是铝、钡、镉和铅。萃取物的pH值根据不同的油漆种类而变化——对于搪瓷漆来说，萃取物的pH值偏酸性，而对于高级乳胶漆来说，萃取物的pH值偏碱性。由于浸出液中存在氢氧化钠，NBR 10.005浸出液的电导率较高。Spearman相关试验表明，涂料的化学成分与渗滤液或溶解萃取物中的金属浓度之间没有显著关系(p值>；0.05)，表明浸出受复杂因素影响。

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来源期刊

Construction and Building Materials 工程技术-材料科学：综合

CiteScore

13.80

自引率

21.60%

发文量

3632

审稿时长

82 days

期刊介绍： Construction and Building Materials offers an international platform for sharing innovative and original research and development in the realm of construction and building materials, along with their practical applications in new projects and repair practices. The journal publishes a diverse array of pioneering research and application papers, detailing laboratory investigations and, to a limited extent, numerical analyses or reports on full-scale projects. Multi-part papers are discouraged. Additionally, Construction and Building Materials features comprehensive case studies and insightful review articles that contribute to new insights in the field. Our focus is on papers related to construction materials, excluding those on structural engineering, geotechnics, and unbound highway layers. Covered materials and technologies encompass cement, concrete reinforcement, bricks and mortars, additives, corrosion technology, ceramics, timber, steel, polymers, glass fibers, recycled materials, bamboo, rammed earth, non-conventional building materials, bituminous materials, and applications in railway materials.