1.安徽理工大学土木建筑学院;2.安徽理工大学矿业工程学院;3.安徽理工大学安全科学与工程学院
安徽省高校自然科学研究项目（2023AH051219）；煤炭精细勘探与智能开发全国重点实验室基金（SKLCRSM23KF007）；国家自然科学基金项目（52074007）；矿山建设工程安徽省高校重点实验室基金（GXZDSYS2022102）；绿色建筑与装配式建造安徽省重点实验室基金（2022-JKYL-007）；建筑结构与地下工程安徽省重点实验室基金（KLBSUE-2021-01）
1.School of Civil Engineering and Architecture, Anhui University of Science and Technology;2.School of Mining Engineering ,Anhui University of Science and Technology;3.. .School of Safety Science and Engineering,Anhui University of Science and Technology,
为探究硅灰（Silica fume，SF)掺量及橡胶粒径对水泥砂浆蠕变性能的影响，采用设计的16组试件进行正交试验，分别对不同硅灰掺量、不同橡胶粒径水泥砂浆的无侧限抗压强度、蠕变特性及微观特征进行分析。结果表明：橡胶颗粒会减小砂浆的无侧限抗压强度，增大蠕变变形，在SF加入后砂浆的强度回升，蠕变变形减少。在蠕变试验中，橡胶砂浆与普通砂浆都经历了三级加载，且橡胶砂浆的蠕变历时更长，硅灰的加入使试件发生破坏的载荷等级明显提高。基于减速蠕变阶段和等速蠕变阶段的试验数据对Burgers模型的参数进行辨识，发现二者的吻合情况较好。微观结构与细观模型很好的显示了橡胶、硅灰对砂浆蠕变性能的协同作用机理。
In order to investigate the effects of silica fume (SF) dosing and rubber particle size on the creep properties of cement mortar, orthogonal tests were carried out using 16 groups of specimens designed to analyse the unconfined compressive strength, creep properties and microscopic characteristics of cement mortar with different silica fume dosing and different rubber particle sizes, respectively. The results showed that the rubber particles would reduce the unconfined compressive strength and increase the creep deformation of the mortar, and the strength of the mortar recovered and the creep deformation decreased after the addition of SF. In the creep test, both rubber mortar and ordinary mortar experienced three levels of loading, and the creep of rubber mortar lasted longer, while the addition of silica fume significantly increased the load level at which the specimen suffered damage. The parameters of the Burgers model were identified based on the test data of the decelerated creep stage and the isokinetic creep stage, and it was found that they were in good agreement.The microstructure and fine-scale modelling show well the synergistic mechanism of rubber and silica fume on the creep performance of mortar.
