D623 improves water retention of fresh mortar and entrains a large amount of micro air void which causes bulk density to reduce, pore size distribution to change.
D623提高保水新鲜砂浆和夹带了大量的微空隙，这会导致堆积密度降低，孔径分布改变。
2
After I have listened, started to dislike it to come, as soon as saw it to come out entrains it, but each time has not bumped into it, it shrinks to the conch in goes.