利用电石渣替代水泥开发固碳胶凝材料

Development of Cementing Material with Carbide Slag Instead of Cement

本研究利用电石渣替代部分水泥,制备新型固碳胶凝材料,研究了不同电石渣含量的胶凝材料对600 kg/m3等级泡沫混凝土的基础性能及固碳性能的影响。研究表明:电石渣的掺入导致泡沫混凝土气孔变大,28 d抗压强度先升高后降低,保温性能提高;当电石渣取代10%水泥,制备出的泡沫混凝土干密度为595 kg/m3,28 d抗压强度比未掺加电石渣的提高4.2%,达5.0 MPa;当电石渣取代50%水泥,制备出的泡沫混凝土导热系数比未掺加电石渣的降低17.1%,为1.131 W·m-1·K-1。电石渣掺加有利于改善泡沫混凝土收缩,当电石渣掺量增加,泡沫混凝土先呈现收缩减小后出现膨胀。碳化养护不仅能够固化封存CO_(2),还能提高泡沫混凝土的力学性能与保温性能。电石渣掺量越高,泡沫混凝土固碳能力越强,电石渣掺量为50%时,CO_(2)的捕获量达到46.02 wt%。

Calcium carbide slag was used to replace part of cement in this study to prepare a new type of cementing material,and the influence of cementing materials with different contents of calcium carbide slag on the basic performance and carbon fixation performance of 600 kg/m3 grade foam-reinforced concrete were studied.The results show that calcium carbide slag can increase the porosity of foamed concrete,increase the compressive strength at 28 d and then decrease,and improve the thermal insulation performance.When calcium carbide slag replaces 10%cement,the dry density of foam-reinforced concrete is 595 kg/m3,and the compressive strength of foam-reinforced concrete increases 4.2%to 5.0 MPa at 28 d.When calcium carbide slag replaces 50%cement,the thermal conductivity of foam concrete decreases by 17.1%to 1.131 W·m-1·K-1.The addition of calcium carbide slag is beneficial to improve the shrinkage of foamed concrete.When the content of calcium carbide slag increases,the shrinkage of foamed concrete decreases first and then expands.Carbonization curing can not only solidify and sequestrate CO_(2),but also improve the mechanical properties and thermal insulation properties of foamed concrete.The higher the content of calcium carbide slag is,the stronger the carbon fixation ability of foam concrete is.When the content of calcium carbide slag is 50%,the CO_(2) capture amount reaches 46.02 wt%.