不同养护条件下内养护补偿收缩砂浆性能研究
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摘要
研究了28 d干燥、保湿7 d后干燥、密封三种干燥条件下复掺高倍吸水树脂(SAP)与Mg O膨胀剂对砂浆性能的影响。研究结果表明:在以上三种条件下,复掺均能降低砂浆的收缩变形、提高砂浆7 d和28 d的抗折强度、抗压强度和抗冻性。复掺在每种干燥条件下对砂浆性能影响不同,密封条件的收缩变形最小,保湿7 d后干燥的抗折强度与抗压强度最大、抗冻性最好。复掺氧化镁膨胀剂掺量为8%时减缩效果最好,强度与抗冻性较单掺SAP砂浆有所提高。
Performance of mortar which mixed with high super-absorbent polymer(SAP) and magnesia expansive agent under 28 d drying,wet maintenance 7 d then drying,closed condition were studied. The results show that super-absorbent polymer(SAP) combined with magnesia expansive agent can not only reduce the shrinkage deformation but also improve flexural strength,compressive strength and frost resistance in the above three drying conditions. The influence of the blending on the mortar's properties under varied conditions is different. The shrinkage deformation in close condition is smallest than others;the flexural strength and compressive strength and the frost resistance is the best when the mortar under wet maintenance 7 d then drying condition. The effect of shrinkage reduction is the best,and the strength and frost resistance are higher than that of SAP mortar when mixing magnesia expansive agent and the amount of it is 8%.
Performance of mortar which mixed with high super-absorbent polymer(SAP) and magnesia expansive agent under 28 d drying,wet maintenance 7 d then drying,closed condition were studied. The results show that super-absorbent polymer(SAP) combined with magnesia expansive agent can not only reduce the shrinkage deformation but also improve flexural strength,compressive strength and frost resistance in the above three drying conditions. The influence of the blending on the mortar's properties under varied conditions is different. The shrinkage deformation in close condition is smallest than others;the flexural strength and compressive strength and the frost resistance is the best when the mortar under wet maintenance 7 d then drying condition. The effect of shrinkage reduction is the best,and the strength and frost resistance are higher than that of SAP mortar when mixing magnesia expansive agent and the amount of it is 8%.
引文
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[2]李明,王育江,王文彬,等.高吸水树脂在水泥基材料中的早期吸水与释水行为[J].硅酸盐学报,2016,11(44):1595-1601.
[3]李维维,陈昌礼,方坤河,等.水灰比对外掺氧化镁混凝土自生体积变形的影响[J].水电能源科学,2011(10):57-59.
[4]秦鸿根,高美蓉,庞超明,等.SAP内养护剂改善膨胀混凝土性能及其机理研究[J].建筑材料学报,2011,3(14):394-399.
[5]贾丽莉,赵日煦,吴雄,等.自养护材料对高强膨胀混凝土性能的影响及机理分析[J].混凝土与水泥制品,2015(8):24-28.
[6]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,2016,2(44):189-195.
[7]姚利君,阮海涛,时略,等.混凝土膨胀剂在不同养护条件下的膨胀性能研究[J].商品混凝土,2006(3):18+33-36.
[8]马先伟,张艳会,武双磊.高吸水树脂对高水灰比水泥砂浆性能的影响[J].混凝土,2015(7):124-127.
[9]Kong X M,Zhang Z L,Lu Z C.Effect of pre-soaked superabsorbent polymer on shrinkage of high-strength concrete[J].Materials and Structures.,2015,9(48):2741-2758.
[10]高培伟,卢小琳,唐明述.膨胀剂对混凝土变形性能的影响[J].南京航空航天大学学报,2006,2(38):251-255.
[11]黄国兴,惠荣炎,王秀军.混凝土徐变与收缩[M].北京:中国电力出版社,2011.