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鉴于粉煤灰和废弃蚌壳对环境的污染,研究了将二者复合用作水泥砂浆掺合料的可行性。通过对蚌壳进行研磨过筛处理,粒度控制在124μm左右,对比分析了不同温度烧结后蚌壳粉与室温蚌壳粉对水泥砂浆性能的影响,确定了蚌壳的适宜烧结温度和掺量。采用X射线衍射(XRD)、扫描电镜(SEM)和热重-差热分析(TG-DTA)等手段对烧结后蚌壳粉改性砂浆水化机理进行了深入分析。研究表明:磨细蚌壳粉经850～900℃烧结后,掺量为3%时对粉煤灰水泥基材料的激发作用最显著,能促进水泥复合胶凝体系的水化,生成大量水化硅酸钙凝胶(C-S-H)和钙矾石(AFt)等水化产物,蚌壳粉改性水泥砂浆的3 d、28 d抗压强度较空白砂浆均有所提高,改性后水泥砂浆具有良好的力学性能。
In view of the environmental pollution caused by fly ash and waste clam shell, the feasibility of compounding the two as cement mortar admixture was studied. The clam shell was grinded and sieved, the particle size was controlled at about 124μm. The influence of clam shell powder and room temperature clam shell powder on the properties of cement mortar after sintering at different temperatures was analyzed. The suitable sintering temperature and content of Clam shell were determined. X-ray diffraction (XRD), scanning electron microscopy (SEM) and thermogravimetry-differential thermal analysis (TG-DTA) were used to analyze the hydration mechanism of the modified mortar powder. The results show that the powdered mussel shell powder has the most obvious stimulating effect on the fly ash cementitious material when it is sintered at 850-900 ℃ with the content of 3%, which can promote the hydration of the cementitious cementitious system and generate a large amount of hydration Calcium silicate gel (CSH) and ettringite (AFt) hydration products, clam shell powder modified cement mortar 3 d, 28 d compressive strength than the blank mortar are improved, the modified cement mortar has Good mechanical properties.