4.2外加剂对砂浆和混凝土中气泡形成的影响4.2.1稠度、抗压强度和气泡特征参数在初步试验中,调整外加剂到合适掺量,测定稠度、28d抗压强度以及气泡特征参数(见第1部分表3)。其中7个砂浆和3个混凝土试样满足所需的干硬性稠度,其压实系数在1.27～1.34之间。由引气剂和原材料引起的系统差异并不明显。砂浆试件28d抗压强度为47.0～52.5MPa,与3个道路混凝土试件的抗压强度相当。主要的差异是由含气量变化造成的。对硬化砂浆的检测显示,气泡间距系数在0.14～0.20mm之间(第 4.2 Effect of admixture on the formation of bubbles in mortar and concrete 4.2.1 Consistency, compressive strength and bubble characteristics In the initial test, the admixture was adjusted to the appropriate dosage, and the consistency, 28d compressive strength and bubble characteristics were measured (see Part 1 Table 3). Seven of the mortars and three concrete specimens meet the required dry and hard consistency with a compaction factor of 1.27 to 1.34. System differences caused by air-entraining agents and raw materials are not obvious. The compressive strength of mortar specimen 28d is 47.0 ~ 52.5MPa, which is equivalent to the compressive strength of three road concrete specimens. The main difference is caused by changes in gas content. Testing of hardened mortar shows that the bubble spacing factor is between 0.14 and 0.20 mm (No.