摘要
为了研究高分子吸水树脂(SAP)对水泥水化热及膨胀混凝土强度的影响,在膨胀混凝土中加入不同掺量的未吸水SAP,通过对水泥水化热及三种水胶比下混凝土抗压强度试验进行分析,可以得出:SAP的掺入会降低水泥水化热温度曲线的峰值,同时还会减少总放热量,且掺量越大,作用效果越明显;当膨胀混凝土水胶比不同时,水胶比越低,SAP对强度的作用效果越明显;SAP对不同水胶比膨胀混凝土强度的影响趋势基本相同,在合理的掺量范围内,加入SAP会提高膨胀混凝土的强度,且掺量越大,对强度的提升作用越明显,但超过合理的掺量范围,SAP的掺量增加会对混凝土强度造成不利影响。
In order to study the effect of super absorbent polymer (SAP) on the hydration heat of cement and the strength of expanded concrete,different amounts of dry SAP were added to the expanded concrete,analyzing the strength of concrete and hydration heat of cement under three water-binder ratios.According to the test,it can be concluded that the addition of SAP will reduce the peak value of the cement hydration heat temperature curve,and will also reduce the total heat release,and the larger the dosage,the more obvious the effect; when the expansion concrete water-gel ratio is not at the same time,the lower the water-to-binder ratio,the more obvious the effect of SAP on the strength; the effect of SAP on the strength of different water-cement ratio expansion concrete is basically the same. In a reasonable dosage range,adding SAP will increase the strength of the expanded concrete,and The larger the dosage,the more obvious the effect on the strength increase,but beyond the reasonable dosage range,the increase of the SAP content will adversely affect the concrete strength.
引文
[1]詹炳根,丁以兵.超强吸水剂对混凝土早期内部相对湿度的影响[J].合肥工业大学学报:自然科学版,2006,29(9):1151-1154.
[2]马先伟,张家科,刘剑辉.高性能水泥基材料内养护剂用高吸水树脂的研究进展[J].硅酸盐学报,2015,43(8):1099-1110.
[3]Jensen O M,Hansen P F.Water-entrained cement-based materials II.experimental observations[J].Cem.Concr.Res.,2002,32:973-978.
[4]孔祥明,张珍林.高吸水树脂对高强混凝土早期减缩效果及机理研究[J].建筑材料学报,2014,17(4):559-565+571.
[5]孔祥明,张珍林.高吸水性树脂对高强混凝土自收缩的减缩机理[J].硅酸盐学报,2014,42(2):150-155.
[6]孔祥明,张珍林.高吸水性树脂对高强混凝土浆体孔结构的影响[J].硅酸盐学报,2013,41(11):1474-1480.
[7]朱长华,李享涛,王保江,等.内养护对混凝土抗裂性及水化的影响[J].建筑材料学报,2013,16(2):221-225.
[8]胡曙光,周宇飞,王发洲,等.高吸水性树脂颗粒对混凝土自收缩与强度的影响[J].华中科技大学学报(城市科学版),2008(1):1-4+16.
[9]王发洲,商得辰,齐广华.SAP对高水胶比混凝土塑性开裂的影响[J].建筑材料学报,2015,18(2):190-194.
[10]陈波,丁建彤,蔡跃波,等.内养护与膨胀剂复合作用对混凝土综合抗裂性能的影响[J].硅酸盐学报,2016,44(2):189-195.
[11]王朦诗,张戎令,宁贵霞,等.SAP对膨胀混凝土力学性能及孔隙结构影响研究[J/OL].长江科学院院报,2018:1-6.