再生砂应用于干混抹灰砂浆的试验研究

Experimental study on the use of the recycled sand in the dry-mixed plastering mortar

采用建筑垃圾经强化工艺处理后筛分得到的粒径不大于4.75 mm的再生细骨料代替天然砂制备干混抹灰砂浆,并掺加一定量的粉煤灰进行改性,调整用水量控制其稠度在90 mm^100 mm范围内,系统研究了不同粉煤灰掺量及胶砂比对其基本性能和力学性能的影响。研究结果表明,干混抹灰砂浆的分层度、表观密度和含气量与粉煤灰掺量及胶砂比均呈现出较强的线性关系,其抗压强度随着胶砂比的减小逐渐降低,且粉煤灰掺量为10%的抗压强度在不同胶砂比条件下均达到最高。

Using recycled fine aggregate that the diameter less than 4.75 mm by building garbage after strengtheningprocess and screening instead of natural sand to prepare dry-mixed plastering mortar, and add a certain amount of flyash to modified, adjusting the water to control the consistency in the range of 90 mm^100 mm, researching the im-pact of the content of fly ash and binder to sand ratio on its basic performance and mechanical properties. The re-search results show there is a strong linear relationship between the layering degree, apparent density, air content ofdry-mixed plastering mortar and the content of fly ash and binder to sand ratio; and the compressive strength decreas-es with the decrease of the binder to sand ratio; and in the binder to sand ratio, the compressive strength reached thehighest when the content of fly ash being 10 %.