砌筑砂浆试配时应采用机械搅拌。搅拌时间应自开始加水算起,并应符合下列规定:1)对水泥砂浆和水泥混合砂浆,搅拌时间不得少于 。2)对预拌砌筑砂浆和掺有粉煤灰、外加剂、保水增稠材料等的砂浆,搅拌时间不得少于 。( )
A.30s 60s B.60s 120s C.120s 180s D.180s 240s正确答案C
砌筑砂浆试配时应采用机械搅拌。搅拌时间应自开始加水算起,并应符合下列规定:1)对水泥砂浆和水泥混合砂浆,搅拌时间不得少于 。2)对预拌砌筑砂浆和掺有粉煤灰、外加剂、保水增稠材料等的砂浆,搅拌时间不得少于 。( )
A.30s 60s B.60s 120s C.120s 180s D.180s 240s正确答案C
