Multi-functional properties of low-carbon travertine aggregate pervious concrete modified by waste limestone powder

IF 6.2 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Developments in the Built Environment Pub Date : 2024-12-15 DOI:10.1016/j.dibe.2024.100590

Tianzhen Li , Xiaonan Tang , Jun Xia

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Abstract

The mining and crushing of limestone and travertine generate substantial quantities of powder and debris, which are typically discarded as solid waste in landfills, posing environmental concerns. To promote waste utilization, this study introduced an innovative pervious concrete combined with travertine aggregate substituting natural aggregate and limestone powder (LSP) as a cement substitute (TALPPC). Different properties of TALPPC were tested and characterized. The results showed that incorporating 5–20% LSP into TALPPC marginally decreased compressive strength, but TALPPC became lighter and had good freeze-thaw resistance. LSP's addition mitigated permeability and porosity by filling concrete pores proportional to its content. Notably, TALPPC demonstrated peak Pb²⁺ immobilization under the ternary competitive mechanism, with LSP enhancing heavy metal ion adsorption. The laboratory-scale TALPPC pavements displayed remarkable heavy metal adsorption capacities and significantly reduced runoff. Given its waste recycling potential, CO₂ mitigation, and engineering suitability, the utilization of 15% LSP in TALPPC production was advised.

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废石灰石粉改性低碳钙华骨料透水混凝土的多功能性能

石灰石和石灰华的开采和破碎产生大量的粉末和碎片，这些粉末和碎片通常作为固体废物丢弃在垃圾填埋场，造成环境问题。为了促进废物的利用，本研究引入了一种创新的由石灰华骨料代替天然骨料和石灰石粉（LSP）代替水泥（TALPPC）的透水混凝土。对TALPPC的不同性能进行了测试和表征。结果表明：加入5-20% LSP后，TALPPC的抗压强度略有降低，但TALPPC变轻，具有良好的抗冻融性能；LSP的加入通过填充成比例的混凝土孔隙来降低渗透率和孔隙率。值得注意的是，在三元竞争机制下，TALPPC表现出Pb2+的固定峰，LSP增强了重金属离子的吸附。实验规模的TALPPC路面表现出显著的重金属吸附能力，并显著减少径流。考虑到其废物回收潜力、二氧化碳减排和工程适用性，建议在TALPPC生产中使用15%的LSP。

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来源期刊

Developments in the Built Environment Multiple-

CiteScore

7.40

自引率

1.20%

发文量

审稿时长

22 days

期刊介绍： Developments in the Built Environment (DIBE) is a recently established peer-reviewed gold open access journal, ensuring that all accepted articles are permanently and freely accessible. Focused on civil engineering and the built environment, DIBE publishes original papers and short communications. Encompassing topics such as construction materials and building sustainability, the journal adopts a holistic approach with the aim of benefiting the community.