普通硅酸盐水泥—铝酸盐水泥—二水石膏胶凝体系的试验研究

发布时间：2018-06-16 08:58

本文选题：三元胶凝体系 + 高效减水剂　；参考：《西安建筑科技大学》2015年硕士论文

【摘要】：当普通硅酸盐水泥、铝酸盐水泥及石膏按一定比例混合时,该三元胶凝体系会产生快硬高强的性能,可配制成快硬高强砂浆或混凝土用于结构锚固、设备基础地脚灌浆、固位及工程抢修等。本文通过对普通硅酸盐水泥-铝酸盐水泥-二水石膏三元胶凝体系进行系统的试验研究,旨在为制备快硬、早强、易于施工的三元胶凝体系修补材料提供依据。本文首先确定了三元胶凝体系的最佳配比,其次通过复掺高效减水剂和缓凝剂研究了高效减水剂和缓凝剂对三元胶凝体系净浆性能的影响,最后采用掺入弓型钢纤维来提高三元体系基体的强度。试验主要测试了净浆的凝结时间和流动性,并测试了砂浆和混凝土的强度,最后采用X-衍射分析仪和扫描电镜对三元胶凝体系水化产物的组成和形貌予以了测试。研究表明:(1)普通硅酸盐水泥-铝酸盐水泥-二水石膏三元胶凝体系的最佳比例为76%∶16%∶8%。(2)高效减水剂复掺缓凝剂后,使得三元胶凝体系的凝结时间不同程度的延长。(3)三元胶凝体系净浆的流动性随着缓凝剂掺量的增加呈现出先增大后减小的规律性,且在掺量为0.09%时,流动度达到最大。(4)缓凝剂的掺入,降低了掺有高效减水剂砂浆的早期强度,而提高了其后期强度,同时缓凝剂柠檬酸对砂浆强度的负面影响要比缓凝剂葡萄糖酸钠的负面影响小。(5)弓型钢纤维对三元胶凝体系砂浆和混凝土的抗压强度、抗折强度及劈裂抗拉强度均有增强效果,其中在三元胶凝体系砂浆中的最佳掺量为2.0%,在三元胶凝体系混凝中的最佳为0.68%。
[Abstract]:When ordinary Portland cement, aluminate cement and gypsum are mixed in a certain proportion, the ternary cementing system will produce fast hardening and high strength properties, which can be prepared as fast hardening high strength mortar or concrete for structural anchoring and equipment foundation foot grouting. Retention and engineering repair, etc. In this paper, the ternary cementing system of common Portland cement, aluminate cement and gypsum dihydrate is studied systematically in order to provide the basis for the preparation of quick hardening, early strength and easy construction of ternary cementing system repair material. In this paper, the optimum ratio of ternary cementitious system was first determined, and the influence of superplasticizer and retarder on the properties of ternary cementitious slurry was studied by mixing with superplasticizer and retarder. Finally, the matrix strength of the ternary system was improved by adding arch steel fiber. The setting time and fluidity of the mortar were tested, and the strength of mortar and concrete was tested. Finally, the composition and morphology of hydration products of ternary cementing system were measured by X-ray diffraction analyzer and scanning electron microscope. The results show that the optimum ratio of the common Portland cement, aluminate cement and gypsum dihydrate ternary cementing system is 76: 16: 8. 2) after the addition of retarder to the superplasticizer, The setting time of the ternary cementitious system is prolonged to some extent. (3) the fluidity of the ternary cementitious slurry increases first and then decreases with the increase of the content of retarder, and when the dosage is 0.09%, the fluidity of the slurry of the ternary cementitious system increases firstly and then decreases with the increase of the content of retarder. The fluidity reached the maximum. 4) the incorporation of retarder reduced the early strength of mortar with superplasticizer, but increased its later strength. At the same time, the negative effect of retarder citric acid on mortar strength is smaller than that of retarder sodium gluconate. The optimum amount of mortar in ternary cementing system is 2.0 and 0.68 in ternary cementing system.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ177

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