高岭土尾砂活化及用于胶凝材料的研究

Activation of Kaolin Tailing and Its Application in Cement Materials

本文以高岭土尾砂为研究对象,通过测定净浆试块抗压强度和化学结合水量,探讨了CaO添加量和球磨时间对尾砂-水泥复合胶凝材料性能及水化进程的影响,并评价了制备的水泥基胶凝材料性能及在混凝土中的应用效果。研究结果表明:尾砂通过配加合适的化学激发剂,经共同研磨处理后再掺入到普通硅酸盐水泥(OPC)中,可获得一种性能优良的水泥基胶凝材料,其胶砂28d抗折和抗压强度较OPC胶砂显著提高,其中28d抗压强度比达到116%;试制的C30混凝土与OPC试制的28d抗压强度比为102%,且明显优于等量代替水泥的粉煤灰和火山灰微粉。该技术不仅可减少水泥用量,降低工程造价,还使尾砂变废为宝,减少占地及环境污染,具有显著的经济与社会效益。

This paper investigates the effects of CaO addition and milling time on the properties and hydration process of kaolin tailing-cement materials through measuring the compressive strength and chemical combined water content of cement paste test blocks. The properties of the prepared cement materials and its application effect in the concrete were further evaluated. The results showed that addition of activated kaolin tailing after grinding pretreatment with activators to pure Poland cement （OPC） can form a kind of cement materials. The cement mortar from cement materials has a better 28 d- strength compared with that of the OPC, 28 d-compressive strength ratio for C30-concrete of the cement mortar to the OPC reaches 102%, which also exceeds that from fly ash and volcanic ash powder. This novel technique can not only reduce the amount of cement and engineering cost, but also change the waste into valuables and control the environmental pollution, which has significant economic and social benefits.