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一、不同掺量的UEA砂浆胀缩曲线取40级UEA,按内掺量为4～12.5%成型1:2砂浆试体,作标准检验,各种养护条件下的限制膨胀率.ε_2测定结果列于表1,胀缩曲线如图1所示.可以看出,随着UEA掺量的提高,膨胀增大,收缩减小;当掺入量低于6%时,14d水养的ε_2<0.02%,即使令期延长,ε_2增长值也甚小,很难起到补偿收缩作用;当掺入量大于10%时,随着掺入量的增加,ε_2及其增长速率显著提高.因此,对于40级UEA,最低掺入量应大于7.5%,才能获得膨胀性能良好的砂浆;当UEA级别更低时,掺入量以大于10%为宜.
1. UEA mortar swelling and shrinkage curves with different dosages take UEA grade 40, and mold the 1:2 mortar specimens with internal content of 4 to 12.5% for standard inspection, and limit the expansion rate under various curing conditions. ε_2 In Table 1, the shrinkage curve is shown in Fig. 1. It can be seen that with the increase of the UEA content, the expansion increases and the shrinkage decreases; when the blending amount is less than 6%, the ε_2< At 0.02%, even if the time period is prolonged, the growth value of ε_2 is very small, and it is difficult to compensate the contraction effect; when the blending amount is more than 10%, ε_2 and its growth rate increase significantly with the increase of the blending amount. Therefore, For class 40 UEA, the minimum incorporation should be greater than 7.5% to obtain a good swelling performance mortar; when the UEA level is lower, the incorporation amount is more than 10%.