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通过对建筑细料和拆除废料进行碱性活化制备的混合粘结剂

Hybrid Binders Through Alkaline Activation of Fine Construction and Demolition Waste.

作者信息

Retamal-Rojas Manuel, Aponte Diego, Valencia-Saavedra William, Robayo-Salazar Rafael, Barra-Bizinotto Marilda

机构信息

Department of Civil and Environmental Engineering, Universitat Politècnica de Catalunya (UPC-BarcelonaTech), Jordi Girona 1-3, 08034 Barcelona, Spain.

Composite Materials Group (CENM), School of Materials Engineering, Universidad del Valle, Cali 760032, Colombia.

出版信息

Materials (Basel). 2025 Jul 8;18(14):3227. doi: 10.3390/ma18143227.

DOI:10.3390/ma18143227
PMID:40731437
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC12300482/
Abstract

The use of construction and demolition waste (CDW) as an alternative binder to ordinary Portland cement presents a promising solution through alkaline activation. This study evaluates the physical, mechanical, and microstructural behaviour of pastes and mortars produced with CDW-specifically concrete (RH) and ceramic (RC) waste-activated with NaOH and NaSiO (SS) solutions. Mortars were prepared with NaOH/SS ratios of 0.2 and 0.3 and an activator-to-precursor (AA/P) ratio of 0.2. Results showed that higher NaOH content accelerated alkaline activation, reducing setting times from 6.2 h to 3.7 h for RC and from 4.6 h to 3.2 h for RH. Conversely, increasing NaSiO content led to greater drying shrinkage, from -0.42% to -0.49% in RC and from -0.46% to -0.52% in RH. Compressive strength values at 28 days ranged from 7.6 to 8.2 MPa. X-ray diffraction (XRD) revealed the presence of non-reactive crystalline phases in both precursors, while Fourier transform infrared (FTIR) spectroscopy indicated the formation of CASH, CSH, and/or (N)CASH gels. This study highlights the potential of CDW as a sustainable alternative binder and the usefulness of the proposed method for optimising alkali-activated systems, contributing to circular economy strategies in the construction sector.

摘要

将建筑拆除废物（CDW）用作普通硅酸盐水泥的替代胶凝材料，通过碱激发提供了一种很有前景的解决方案。本研究评估了用CDW（具体为用NaOH和NaSiO（SS）溶液激发的混凝土（RH）和陶瓷（RC）废料）制备的浆体和砂浆的物理、力学和微观结构性能。制备砂浆时，NaOH/SS比为0.2和0.3，激发剂与前驱体（AA/P）比为0.2。结果表明，较高的NaOH含量加速了碱激发，使RC的凝结时间从6.2小时缩短至3.7小时，RH的凝结时间从4.6小时缩短至3.2小时。相反，增加NaSiO含量导致更大的干燥收缩，RC中从-0.42%增加到-0.49%，RH中从-0.46%增加到-0.52%。28天的抗压强度值在7.6至8.2MPa之间。X射线衍射（XRD）显示两种前驱体中均存在非反应性结晶相，而傅里叶变换红外（FTIR）光谱表明形成了CASH、CSH和/或（N）CASH凝胶。本研究突出了CDW作为可持续替代胶凝材料的潜力以及所提出的优化碱激发体系方法的实用性，为建筑行业的循环经济战略做出了贡献。

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