低等级粉煤灰-高硅矿石复合掺合料制备及性能

矿物掺合料已经成为现代混凝土不可或缺的重要原材料之一,限于环保要求,目前普遍使用的矿渣粉和粉煤灰等掺合料面临资源短缺及价格上涨问题。为开拓矿物掺合料新市场,提出以低等级粉煤灰和高硅矿石制备混凝土用复合掺合料,研究复合掺合料各项性能并探索其技术可行性。研究结果表明:低等级粉煤灰和高硅矿石粉复合,能够调节复合掺合料的化学组成,使之满足于相关标准需要;但是利用低等级粉煤灰和高硅矿石粉制备的复合掺合料的工作性和力学性能基本介于低等级粉煤灰和高硅矿石粉之间,两者性能和功能叠加效应并不明显。

Preparation and Properties of Compound Mineral Admixtures with Low Grade Fly Ash and High Silicon Minerals

Mineral admixtures have become one of the most important raw materials in modern concrete. But the slags and fly ashes which were widely appllied in concrete are facing resource shortage and rising prices. In this paper, low-grade fly ash and high silicon minerals were used as raw materials to prepare the compound mineral admixtures for concrete. And the composition and properties of the prepared compound mineral admixtures have also been studied. The results showed that the compound of low-grade fly ash and high silicon mineral powders could effectively adjust the composition of compound mineral admixtures, which would make it meet the requirement of relevant standards of fly ash and compound mineral admixture. However, the workability and mechanical properties of compound mineral admixtures were somewhere between low-grade fly ash and high silicon mineral powders. And no obvious performance and functional superposition effect were observed.