燃煤炉渣掺量与水胶比对混凝土自收缩性能耦合影响及预测模型-《混凝土与水泥制品》杂志社

燃煤炉渣掺量与水胶比对混凝土自收缩性能耦合影响及预测模型

Coupling effects of coal bottom ash content and water-to-binder ratio on the autogenous shrinkage of concrete and its prediction model

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关键词：

燃煤炉渣（CBA）；混凝土；水胶比；自收缩；模型；性能预测

Key words：

Coal bottom ash (CBA); Concrete; Water-to-binder ratio; Autogenous shrinkage; Model; Performance prediction

刊期：

2026年第9期

DOI：

10.19761/j.1000-4637.25110518

文章编号：

基金项目：

内蒙古自治区科技计划项目（2023YFHH0116）；内蒙古自治区直属高校基本科研业务费项目（ZTY2025067）。

作者：

焦选文1，张伟一1，孙磊2，周东2，石东升1，*

单位：

1.内蒙古工业大学土木工程学院，内蒙古自治区呼和浩特 010051；2.兴泰建设集团有限公司，内蒙古自治区呼和浩特 010000

摘要

摘要：燃煤炉渣（Coal bottom ash，CBA）是燃煤发电产生的大宗固体废弃物，堆存处置易造成严重的生态环境问题，将其资源化应用于混凝土中是实现固废消纳与建材绿色发展的有效途径。自收缩作为混凝土早期主要变形特征，易在基体内部产生拉应力，诱发微裂缝萌生与扩展，劣化混凝土耐久性能，缩短结构服役寿命。为探究CBA作为细骨料对混凝土自收缩的影响，本文以水胶比（0.2、0.4、0.6）、CBA掺量（0、25%、50%、75%、100%）为变量，开展了混凝土自收缩试验，并基于Logistic函数构建了混凝土自收缩预测模型。结果表明：CBA混凝土自收缩整体呈现早期快速增长、后期增速趋缓的龄期演化特征，且CBA掺量对水胶比的收缩效应具有明显调控作用，不同CBA掺量下水胶比与28 d自收缩的对应规律存在明显差异；CBA掺量对混凝土自收缩的改善效果具有明显水胶比依赖性，在中高水胶比（0.4、0.6）体系下，随CBA掺量增加，混凝土28 d自收缩持续降低，在低水胶比（0.2）体系下，28 d自收缩随CBA掺量增加呈先升后降的变化趋势；建立的混凝土自收缩预测模型决定系数R2均大于0.92，试验值与预测值吻合度较高，可精准表征CBA混凝土自收缩的演化规律。研究成果可为CBA的资源化利用及混凝土自收缩性能优化与预测提供参考。

Abstract: Coal bottom ash (CBA) is a large-volume solid waste generated from coal-fired power generation. Its stockpiling causes severe ecological and environmental issues. Reusing CBA in concrete serves as an effective approach to solid waste disposal and sustainable development of green building materials. As a dominant early-age deformation characteristic of concrete, autogenous shrinkage induces internal tensile stress and promotes the initiation and propagation of microcracks, which degrades the durability and shortens the service life of concrete structures. To explore the effect of CBA as fine aggregate on concrete autogenous shrinkage, autogenous shrinkage tests were carried out with water-to-binder ratios (0.2, 0.4, 0.6) and CBA content (0, 25%, 50%, 75%, 100%) as variables, and an autogenous shrinkage prediction model for concrete was established based on the Logistic function. The results show that the autogenous shrinkage of concrete with CBA increases rapidly at early ages and grows moderately at later ages. The CBA content significantly regulates the influence of water-to-binder ratio on autogenous shrinkage, and the correlation between water-to-binder ratio and 28-day autogenous shrinkage varies greatly under different CBA contents. The mitigating effect of CBA content on autogenous shrinkage is dependent on the water-to-binder ratio. For medium and high water-to-binder ratios (0.4, 0.6), the 28-day autogenous shrinkage of concrete decreases continuously with the rising CBA content. For the low water-to-binder ratio of 0.2, the 28-day autogenous shrinkage rises first and then declines as more CBA is incorporated. The determination coefficients R2 of the proposed autogenous shrinkage prediction model are all higher than 0.92, indicating good consistency between experimental and predicted values. The model can accurately characterize the evolution law of autogenous shrinkage of concrete with CBA.The research results can provide references for the resource utilization of CBA as well as the optimization and prediction of concrete autogenous shrinkage performance.

结论

（1）各试验工况下，CBA混凝土自收缩值均随龄期延长基本增长，整体呈现早期快速增长、后期增速放缓的规律。CBA掺量明显调控水胶比对混凝土28 d自收缩的影响规律：当CBA掺量为0、75%、100%时，混凝土28 d自收缩值随水胶比的高低排序依次为0.4、0.6、0.2；当CBA掺量为25%时，混凝土28 d自收缩值随水胶比的高低排序依次为0.4、0.2、0.6；当CBA掺量为50%时，混凝土28 d自收缩值随水胶比增大持续降低，高低排序依次为0.2、0.4、0.6。
（2）CBA掺量对混凝土自收缩的影响具有明显的水胶比依赖性。对于0.2低水胶比体系，CBA掺量对28 d自收缩的影响呈现阶段性特征，当CBA掺量由0增至50%时，混凝土的28 d自收缩值增大，当掺量进一步增至75%~100%时，28 d自收缩值降低；对于0.4、0.6中高水胶比体系，随着CBA掺量的增加，混凝土28 d自收缩值持续降低。
（3）基于Logistic映射与多元非线性拟合，构建了适配CBA混凝土的自收缩预测模型。各工况拟合决定系数R²均大于0.92，模型预测值与试验值演化规律高度契合，可精准反映CBA混凝土自收缩发展特征，预测精度较高、适用性良好。

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引用本文

焦选文,张伟一,孙磊,等.燃煤炉渣掺量与水胶比对混凝土自收缩性能耦合影响及预测模型[J].混凝土与水泥制品,2026,53(9):96-101. Jiao Xuanwen,Zhang Weiyi,Sun Lei,et al.Coupling effects of coal bottom ash content and water-to-binder ratio on the autogenous shrinkage of concrete and its prediction model[J].China Concrete and Cement Products,2026,53(9):96-101 (in Chinese).

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