预置再生砖骨料灌浆混凝土物理力学性能影响因素研究

摘要

It is an effective way to make use of the abandoned brick aggregate by making recycled concrete medium bricks using pre-placed brick aggregate grouting method .The middle and lower strength concrete was prepared by mixing ce-ment ,fly ash ,recycled brick aggregate as raw materials and water reducing agent ,foaming agent as admixtures through the use of pre-placed recycled brick aggregate grouting technique .The influence of water-cement ratio ,the substitution quantity of fly ash and foam content on the strength ,dry density and water absorption of the concrete specimens was in-vestigated through orthogonal tests .According to the test results ,the best water-cement ratio was 0 .45 and the optimal substitution quantity of fly ash was 20% ,different amount of foams should be determined based on the strength and heat preservation performance requirements of the concrete .%采用预置砖骨料灌浆的方法制作再生混凝土中型砌块，是实现废弃砖骨料再生利用的一种有效途径。以水泥、粉煤灰和再生砖骨料为原料，减水剂和发泡剂为外加剂，通过向预置的砖骨料内灌浆的工艺制备中低强度混凝土，研究水胶比、粉煤灰取代量、泡沫掺量对混凝土强度、干密度和吸水率的影响规律。通过正交试验分析确定最佳配合比为水胶比0．45，粉煤灰取代量20％，根据强度及保温性能要求综合考虑，选择不同泡沫掺量。