非晶态C12A7具有更高的、亚稳态化学能,具有较快的水化速率,少量的存在能够加速水泥的凝结硬化.本试验研究非晶态C12A7矿物对普通硅酸盐水泥(OPC)的性能影响,重点探究了C12A7与OPC中SO3的比例在0~2.0时,对OPC的凝结时间、流动度、早期抗压强度等性能的影响,并通过灰色关联度法进行C12A7/SO3优选,对最优比例试样采用水化放热、XRD、SEM等表征手段分析其微观机理.结果表明:非晶态C12A7的掺入能够加速OPC的凝结硬化并降低其流动度;不同的C12A7/SO3对OPC胶砂早期强度的贡献程度分别不同,C12A7/SO3为0.4时能够显著优化OPC的早期性能;C12A7的掺入能够加速OPC中C3S、C2S的水解,反应生成的钙矾石、C-S-H凝胶及氢氧化钙等水化产物胶结在一起,从而起到早强作用.
Since amorphous C12A7 has higher, metastable state chemical energy, it has a faster rate of hydration.The setting and hardening of OPC can be accelerated just by the existence of small amounts of C12A7.The effect of amorphous C12A7 mineral on OPC properties were studied.The effects of 0-2.0 ratio of C12A7/SO3 on OPC macroscopic properties including setting time, fluidity and early compressive strength were discussed.At the same time, the optimal C12A7/SO3 ratio carried out preferably by gray related degree method, and then its microscopic mechanism was analyzed by hydration heat, XRD, SEM.The results show that: adding amorphous C12A7 can accelerate OPC coagulated and reduce its fluidity.The effect of different ratio of C12A7/SO3 on OPC mortar early strength is different respectively, which can significantly optimized OPC earlier performance when C12A7/SO3 is 0.4.C12A7 can accelerate the hydrolysis of C3S, C2S in OPC.Reaction of hydration products including ettringite, C-S-H gel and calcium hydroxide cemente together, which play an important role in early hardening of OPC.
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