CAJ | 학술논문

为了研究不同替代率下机制砂混凝土劈裂抗拉强度的变化规律，拟选用机制砂配制C50混凝土，在水泥用量保持不变的情况下，改变机制砂对天然砂的取代率（0、30%、50%、70%、100%）。试验发现机制砂混凝土的劈裂抗拉强度大于天然砂混凝土的劈裂抗拉强度且随着替代率的增大和龄期的增长机制砂混凝土的劈裂抗拉强度呈现增大的趋势，但是替代率为50%的劈裂抗拉强度最大，说明该机制砂对天然砂的最佳替代率为50%左右。通过分析发现高强机制砂混凝土的劈裂抗拉强度与抗压强度之间的拟合关系与普通混凝土不同，用普通混凝土的拟合方程计算值偏小。
위료연구불동체대솔하궤제사혼응토벽렬항랍강도적변화규률，의선용궤제사배제C50혼응토，재수니용량보지불변적정황하，개변궤제사대천연사적취대솔（0、30%、50%、70%、100%）。시험발현궤제사혼응토적벽렬항랍강도대우천연사혼응토적벽렬항랍강도차수착체대솔적증대화령기적증장궤제사혼응토적벽렬항랍강도정현증대적추세，단시체대솔위50%적벽렬항랍강도최대，설명해궤제사대천연사적최가체대솔위50%좌우。통과분석발현고강궤제사혼응토적벽렬항랍강도여항압강도지간적의합관계여보통혼응토불동，용보통혼응토적의합방정계산치편소。
In order to study the change of split strength of the manufactured sand concrete at different replacement ,C50 was prepared at the same cement consumption with the replacement ratios of manufactured sand by mass to the natural sand were 0、30%、50%、70%and 100%respectively.The split strength of manufactured sand concrete was stronger than that of natural sand and it showed an increasing trend with the increasing of replacement rate and age but the split of replacement rate of 50%was largest.This showed that the optimum re-placement ratio of the manufactured sand by mass to the natural sand was 50%.The analysis showed that the fitting relations between split and compressive strength was different with that of ordinary concrete and the value of the ordinary concrete equation was smaller.