废弃石粉对混凝土的性能影响及碳排放分析

Influence of Waste Stone Powder on Properties and Carbon Emissions of Concrete

为解决机制砂生产过程产生的废弃石粉(WSP)处置难题,本文提出了将废弃石粉用作混凝土矿物掺合料的利用新途径,研究了废弃石粉的特征及其对混凝土抗压强度与孔结构的影响,并基于生命周期评价方法分析了利用废弃石粉带来的碳减排效益.结果表明:废弃石粉虽较磨细石粉(GSP)具有更高的亚甲蓝值,但对砂浆流动度的影响较小;相比于磨细石粉和粉煤灰,废弃石粉会降低低强度等级混凝土的抗压强度,但对高强度等级混凝土的抗压强度影响较小;废弃石粉作为矿物掺合料可有效降低混凝土的生产碳排放,内掺20%废弃石粉的混凝土碳排放总量降低了近20%.

In order to solve the disposal problem of waste stone powder(WSP)generated in the production of manufactured sand,a new strategy was proposed to reuse it as a mineral admixture for concrete.The characteristics of WSP and its influence on the compressive strength and pore structure of concrete were studied,and the carbon emissions reduction benefits brought by the use of WSP were analyzed based on the life cycle assessment method.The results show that although WSP has a higher methylene blue value than ground stone powder(GSP),it has little influence on the flowability of the mortar.Compared to GSP and fly ash,WSP reduces the compressive strength of low-strength grade concrete,but has a moderate influence on the compressive strength of high-strength grade concrete.WSP as a mineral admixture can effectively reduce carbon emissions from concrete production,and the total carbon emissions of concrete mixed with 20%WSP are reduced by nearly 20%.