范玉辉,台悟生,王鹏辉,等.甲基丙烯酸甲酯复合改性再生粗骨料混凝土徐变性能[J].河南理工大学学报(自然科学版)，doi:10.16186/j.cnki.1673-9787.2025090043.

FAN Y H, TAI W S , WANG P H, et al．Creep performance of methyl methacrylate composite modified recycled coarse aggregate concrete[J]. Journal of Henan Polytechnic University( Natural Science)，doi:10.16186/j.cnki.1673-9787.2025090043.

甲基丙烯酸甲酯复合改性再生粗骨料混凝土徐变性能(网络首发)

范玉辉1，2，台悟生1，王鹏辉1，徐平1

1. 河南理工大学 土木工程学院，河南 焦作 454003;  2. 河南理工大学 生态建筑与环境构建河南省工程实验室，河南 焦作 454003

摘要: 目的 为了降低再生混凝土的徐变，针对再生粗骨料中老砂浆徐变特性对再生混凝土徐变的影响，本文通过降低再生粗骨料中老砂浆徐变的方法对再生混凝土的低徐变化进行了研究。方法 首先采用水泥预裹浆+甲基丙烯酸甲酯单体（MMA）浸渍-聚合的复合方法对再生粗骨料进行了强化预处理，从而填充再生骨料中的微裂缝和较大孔隙，提高再生粗骨料的力学性能，降低再生粗骨料的徐变变形；之后通过再生混凝土徐变试验研究，结合再生粗骨料对再生混凝土徐变影响机理的分析，建立了考虑再生混凝土中粗骨料徐变性能和力学性能的再生混凝土徐变计算模型。结果 MMA复合改性后，再生粗骨料的吸水率降低了70.3％，压碎指标降低了42.0％，总孔隙含量降低了85.5％，无害孔含量降低了80.8%，少害孔含量降低了96.9%，有害孔含量降低了88.6%，多害孔含量降低了67.5%。MMA复合改性再生粗骨料可有效降低再生混凝土徐变，取代率为33％，66％，100％时，MMA复合改性再生粗骨料混凝土240d徐变度较普通再生混凝土分别降低了15.91%，20.03%和31.19%；考虑再生混凝土中粗骨料徐变性能和力学性能的徐变计算模型可以较好的计算再生混凝土的徐变。结论 MMA复合改性可以有效提升再生粗骨料的力学性能，改善再生粗骨料的孔隙结构，从而降低再生粗骨料混凝土的徐变。

关键词:再生粗骨料；老砂浆；复合改性；再生混凝土；徐变

doi: 10.16186/j.cnki.1673-9787.2025090043

基金项目:国家自然科学基金资助项目(52478250)；河南省高等学校重点科研项目(23A560008)

收稿日期：2025-09-25

修回日期：2026-01-13

网络首发日期：2026-09-14

Creep performance of methyl methacrylate composite modified recycled coarse aggregate concrete (Online)

Fan Yuhui1，2，Tai Wusheng1，Wang Penghui1，Xu Ping1

1. School of Civil Engineering, Henan Polytechnic University, Jiaozuo 454003, Henan，China;

2. Henan Province Engineering Laboratory for Eco-architecture and Built Environment, Henan Polytechnic University, Jiaozuo 454003, Henan，China

Abstract: Objectives In order to reduce the creep of recycled coarse aggregate concrete (RAC), this study investigates the effect of creep characteristics of old mortar in recycled coarse aggregates (RCA) on the creep behavior of RAC. The research focuses on achieving low creep in RAC by reducing the creep of the old mortar within the RCA．Methods First, a composite treatment method involving cement pre-coating followed by methyl methacrylate (MMA) impregnation and polymerization was used to strengthen the RCA. This process aimed to fill micro-cracks and larger pores in the RCA, thereby enhancing its mechanical properties and reducing its creep deformation. Subsequently, through creep testing of RAC and an analysis of the influence of RCA on concrete creep, a creep prediction model for RAC was developed. This model incorporates the creep and mechanical properties of the coarse aggregates. Results After MMA composite modification, the properties of RCA exhibited significant improvements: water absorption decreased by 70.3%, the crushing index was reduced by 42.0%, and total porosity diminished by 85.5%. A detailed pore structure analysis revealed reductions of 80.8% in harmless pores, 96.9% in less harmful pores, 88.6% in harmful pores, and 67.5% in more harmful pores. The use of MMA-modified RCA effectively reduced the creep of RAC. At replacement ratios of 33%, 66%, and 100%, the 240-day creep degree of the RAC with modified-RCA was lowered by 15.91%, 20.03%, and 31.19%, respectively, compared to conventional RAC. Furthermore, the developed creep prediction model, which incorporates the creep and mechanical properties of the coarse aggregates, provided accurate predictions for the creep behavior of RAC. Conclusions MMA composite modification can effectively enhance the mechanical properties and improve the pore structure of RCA, thereby reducing the creep of RAC．

Key words:Recycled coarse aggregate; old mortar; composite modification; recycled coarse aggregate concrete; creep