【摘要】 以P.O 42.5硫铝酸盐水泥为基体材料，通过将不同掺杂量的S105矿渣添加到混凝土中制备了硫铝酸盐高性能水泥混凝土。研究了S105矿渣的掺杂量对混凝土晶格结构、微观形貌、力学性能、抗冻性能和氯离子扩散性能的影响。结果表明，适量S105矿渣的添加加速了混凝土的水化反应，增大了水化凝胶的均匀性和致密度，减少了孔洞和裂纹的出现。随着S105矿渣掺杂量的增大，混凝土的抗压强度、抗折强度和劈裂抗拉强度均表现出先增大后降低的趋势，养护28 d时，S105矿渣掺杂量30%（质量分数）的混凝土的抗压强度、抗折强度和劈裂抗拉强度均达到最大值，分别为47.4,10.4和2.59 MPa。S105矿渣的添加减小了混凝土的氯离子扩散系数，养护28 d时，S105矿渣掺杂量60%（质量分数）的混凝土的氯离子扩散系数最小为1.35×10^-8 cm²/s。S105矿渣的添加提高了混凝土的抗冻性能，经过冻融循环90次后，S105矿渣掺杂量30%（质量分数）的混凝土的抗压强度最大为35.1 MPa,抗压强度衰减最少为25.95%。更多还原

【Abstract】 With P.O 42.5 sulphoaluminate cement as the base material, sulphoaluminate high performance cement concrete was prepared by adding S105 slag with different doping amounts to the concrete. The effect of S105 slag doping amount on the lattice structure, microstructure, mechanical properties, frost resistance, and chloride ion diffusion performance of concrete was studied. The results showed that the addition of appropriate S105 slag accelerated the hydration reaction of concrete, increased the uniformity and density of hydration gel, and reduced the occurrence of holes and cracks. With the increase of S105 slag doping amount, the compressive strength, flexural strength, and splitting tensile strength of concrete showed a trend of first increasing and then decreasing. After 28 d of curing, the compressive strength, flexural strength and splitting tensile strength of concrete with a 30wt% content of S105 slag reached their maximum values, which were 47.4,10.4 and 2.59 MPa, respectively. The addition of S105 slag reduced the chloride ion diffusion coefficient of concrete. After 28 d of curing, the minimum chloride ion diffusion coefficient of concrete with a 60wt% content of S105 slag was 1.35×10^-8 cm²/s. The addition of S105 slag improved the frost resistance of concrete. After 90 freeze-thaw cycles, the maximum compressive strength of concrete with a 30wt% content of S105 slag was 35.1 MPa, and the minimum compressive strength attenuation was 25.95%.更多还原