矿渣粉掺量对高水材料物理力学性能的影响研究

为了降低高水材料充填体成本、提高充填体强度,并有效开发利用矿山工业固体废弃物,开展了掺入有活性成分的矿渣粉对高水材料浆液和充填体物理力学性能及晶体微观结构影响的试验研究。结果表明,随着矿渣粉掺量增加,浆液初凝时间缩短,试件的含水率降低、容重增大,且含水率与峰值抗压强度及容重与峰值抗压强度均具有较好的二次相关关系;随着矿渣粉掺量的增加,试件的峰值抗压强度与残余强度均先减小后增大,掺量为10%时,峰值抗压强度与残余强度均达最小值;从材料的微观结构可以看出,矿渣粉的掺入促进了钙矾石晶体和硅酸钙凝胶的生长发育,改变了晶体发育形貌及网状结构形态。在试验掺量范围内,掺加20%的矿渣粉可使试件晶体空间网状结构最为致密,在宏观上表现为峰值抗压强度达最大值。

Study on Physical and Mechanical Properties of Modified High-water Material with Different Content of Slag Powder

In order to reduce the filling cost of high-water material,improve the strength of filling material,and utilize solid waste in mine industry effectively,the impact of slag powder with addition of active components on the physical and mechanical properties and the crystal microstructure of high-water slurry and filling body are investigated.The test results showed that with the increase of slag powder content,the initial setting time was shortened,and the water content of the sample was decreased,but the unit weight was increased.What′s more,both the water content and the peak compressive strength have a better quadratic function relationship with the unit weight and the peak compressive strength；With the increase of slag powder content,the peak compressive strength and residual strength both decreased and then increased,and both of them reached the minimum when the slag powder content was 10%；From the microstructure of high-water material,it was clear that the addition of slag powder promoted the growth of ettringite crystal and calcium silicate hydrate gel,changed the crystal shapes and the space mesh structure.The addition of 20% slag powder can make the space mesh structure in most dense state,and its peak compressive strength reached the maximum in macroscopic state.