An alternative approach to improve the compatibility of PCE in cement paste blend with coal gangue powder

Waste Disposal & Sustainable Energy Pub Date : 2023-11-20 DOI:10.1007/s42768-023-00174-y

Zonglin Xie, Yuxuan Li, Dahui Sun, Yi Tian, Jinyuan Hu, Qiang Yuan, Zheng Chen

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Abstract

Coal gangue (CG) is an environmental waste that faces an urgent demand for disposal in China. The utilization of CG in construction materials has broad application prospects and gained increasing interest. However, the poor compatibility of polycarboxylate superplasticizer (PCE) with CG powder hinders its efficiency in a wide range of applications. Here, this paper attempts to improve the compatibility of PCE with CG powder in cement paste based on the regulation of aggregation and the adsorption behavior of PCE. Dynamic light scattering (DLS) and fluorescence spectroscopy tests were carried out to understand the improved mechanism. The results indicated that the addition of CG powder increases the ionic strengths of the cement liquid phase, which makes PCE tend to aggregate at a lower concentration compared with no CG powder introduction. Adding (CH₃COO)₂Cu is beneficial for enhancing the workability of cement paste by reducing PCE aggregation while maintaining the compressive strength of cement specimens. Therefore, (CH₃COO)₂Cu extra addition can be regarded as an effective and sustainable way to improve the workability of cement paste with CG powder.

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一种改善PCE与煤矸石粉水泥浆体相容性的替代方法

煤矸石是一种环境废弃物，在中国面临着迫切的处理需求。CG在建筑材料中的应用具有广阔的应用前景，越来越受到人们的关注。然而，聚羧酸酯型高效减水剂(PCE)与CG粉的相容性较差，阻碍了它的广泛应用。本文试图从PCE的聚集调节和吸附行为出发，改善水泥浆体中PCE与CG粉的相容性，通过动态光散射(Dynamic light scattering, DLS)和荧光光谱测试来了解改善的机理。结果表明，CG粉的加入提高了水泥液相的离子强度，使PCE在较低浓度下倾向于聚合。添加(CH3COO)2Cu有利于在保持水泥试件抗压强度的同时，通过减少PCE聚集来提高水泥浆体的和易性。因此，(CH3COO)2Cu的添加是一种有效且可持续的改善CG粉水泥浆体和易性的方法。图形抽象

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Waste Disposal & Sustainable Energy

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