| 雷庆关,张城,潘崇根,朱大勇,臧家伟.水泥基复合胶凝材料改性聚合物修补砂浆的试验研究[J].安徽建筑大学学报,2023,31(3):8-15 |
| 水泥基复合胶凝材料改性聚合物修补砂浆的试验研究 |
| Experimental Study on Polymer Repair Mortar Modified by Cement-based Composite Cementitious Material |
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| 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 microstructure |
| 基金项目:浙江省基础公益研究计划项目（LGG21E080006）；宁波市“科技创新 2025”重大专项项目（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修补砂浆的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 分析解释宏观性能变化。结果表明：当 PO 占复合胶凝体系比例达 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，28 d 时的收缩率为 -3.21×10-4；早期强度高，1 d 抗压强度达到 26.1 MPa，且后期抗压、抗折强度增长幅度大；界面粘结性能优异，28 d 粘结强度可达到 4.4 MPa。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: |
| To address the problems of fast setting time and decreasing flexural strength of sulfoaluminate cement-based repairmaterials，the ordinary silicate（PO）-sulfoaluminate cement （SAC） modified polymer rapid-repair materials was proposed. Theeffects of PO-SAC composite cementitious system on the fresh and mechanical properties of polymer repair mortar as well as on theinterfacial bonding properties of mortar are studied. SEM analysis was used to explain the macroscopic property changes. The resultsshow that when PO accounts for 90% of the composite cementitious system，the setting time of the polymer repair mortar is significantlylonger than that of SAC，which meets the needs of repair；the mortar has a good flowability and slight-expansion，with a shrinkagerate of -3.21×10-4 at 28 d，and high early strength，with a compressive strength of 26.1 MPa at 1 d；the compressive and flexuralstrengths increase largely；the interfacial bonding performance is great，with a bonding strength of 4.4 MPa at 28 d. With the increaseof PO，the hydration product ettringite （AFt） in the system will decrease，and the microscopic morphology of the mortar become lessdense，which hinders the early strength development and shrinkage of the cement paste. |
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