蒸压加气混凝土砌块薄灰缝砌筑砂浆保水性研究

Study on Water Retention of Mortar in Thin Mortar Joints of Autocluded Aerated Concrete Blocks

主要研究了低品位二、三级硅藻土与纤维素醚协同作用对薄灰缝砌筑砂浆保水性能的影响。试验结果表明,经活化处理的硅藻土能显著提高砂浆的保水性以及力学性能,经10 min机械活化、2 h 600℃热活化处理的硅藻土薄灰缝砌筑砂浆保水率最高可达95.7%,较空白组提高了22%;HPMC能提高砂浆的保水性,但明显降低砂浆的力学性能,掺量为0.27%时,砂浆的保水率达到最优99.4%;当硅藻土与纤维素醚混掺时,保水率≥99%,能显著降低纤维素醚用量,有较好的经济与环保价值。

The water retention performance of low-grade diatomite and cellulose ether in thin mortar mortar was studied.The test results show that the activated treatment of diatomite can significantly improve the water retention and mechanical properties of the mortar.The water retention rate of the thin mortar mortar treated by mechanical activation for 10 min and thermal activation at 600℃for 2 h is up to 95.7%,which is 22%higher than that of the blank group.HPMC can improve the water retention of mortar but significantly reduce its mechanical properties.When the mixing amount is 0.27%,the water retention rate of mortar reaches 99.4%.When diatomite is mixed with cellulose,the water retention rate is≥99%,and the amount of cellulose is significantly reduced,which has better economic and environmental value.