| 雷庆关,张城,潘崇根,朱大勇,臧家伟.水泥基复合胶凝材料协同改性聚合物快速修补材料试验研究[J].安徽建筑大学学报,2023,31(): |
| 水泥基复合胶凝材料协同改性聚合物快速修补材料试验研究 |
| Experimental study on fast repair material of cement-based composite cementitious material with synergistic modification of polymer |
| 投稿时间：2022-11-12 修订日期：2022-11-30 |
| DOI： |
| 中文关键词: 聚合物 界面 硅酸盐水泥 硫铝酸盐水泥 复合胶凝体系 微观形貌 |
| 英文关键词: Polymer Interface Portland cement Sulphoaluminate cement Composite cementitious system The microstructure |
| 基金项目:浙江省公益基金项目（LGG21E080006）；宁波市2025重大专项（2019B10049；2020Z035；2020Z040） |
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| 中文摘要: |
| 针对硫铝酸盐水泥基修补材料凝结时间快、抗折强度倒缩等问题,提出以普通硅酸盐(PO)-硫铝酸盐水泥(SAC)复合改性聚合物快速修补材料性能,探究PO-SAC复合胶凝体系对聚合物快速修补材料新拌性能和力学性能的影响,并且进一步研究了复合体系对砂浆界面粘结性能的影响,采用SEM分析对宏观性能变化做出合理的解释。结果表明：当PO占复合胶凝体系90%时,聚合物修补砂浆的凝结时间相比SAC明显延长,满足修补需求；流动性能良好,砂浆呈现微膨胀性,28d时的收缩率是-3.21′10-4；早期强度高,1d抗压强度达到26.1MPa,且后期抗压、抗折强度增长幅度大；界面粘结性能优异,28d粘结强度可达到4.4MPa。随着PO的掺入,复合胶凝体系的水化产物钙矾石(AFt)会逐渐减少,砂浆微观形貌不致密,不利于水泥浆体早期强度和收缩的发展。 |
| 英文摘要: |
| Aiming at the problems of fast setting time and shrinkage of flexural strength of sulfoaluminate cement-based repair materials, the performance of ordinary silicate (PO)-sulfoaluminate cement (SAC) composite modified polymer rapid repair materials was proposed to explore the performance of the repair materials. The effect of PO-SAC composite gelling system on the fresh-mixing properties and mechanical properties of polymer quick repair materials, and the effect of composite system on the interfacial bonding properties of mortar was further studied, and SEM analysis was used to provide a reasonable explanation for the changes in macroscopic properties. The results show that when PO accounts for 90% of the composite cementitious system, the setting time of the polymer repair mortar is significantly longer than that of SAC, which meets the needs of repair; the flow performance is good, the mortar exhibits micro-expansion, and the shrinkage rate at 28d is -3.21′ 10-4; high early strength, 1d compressive strength reaches 26.1MPa, and later compressive and flexural strength increases greatly; excellent interface bonding performance, 28d bonding strength can reach 4.4MPa. With the addition of PO, the hydration product ettringite (AFt) of the composite cementation system will gradually decrease, and the microscopic morphology of the mortar is not dense, which is not conducive to the development of the early strength and shrinkage of the cement paste. |
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