内养护材料高吸水树脂(SAP)和陶粒对混凝土性能影响的对比研究
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摘要
为了对比两种不同内养护材料高吸水树脂(SAP)和陶粒对混凝土性能的影响,研究了SAP对水泥砂浆抗压强度、抗裂性能和干缩性能的影响。同时研究对比了SAP和陶粒对大坝面板混凝土早期开裂性能、力学性能、变形性能的和耐久性能的影响。结果表明:在保持同样拌和性能的条件下,掺加SAP和陶粒后,可引起单位用水量的不同程度的增加;掺加陶粒和SAP后,将会引起混凝土抗压强度和极限拉伸值不同程度的降低;掺加陶粒和SAP的混凝土早期干缩略小于基准样,随着水化的进行干缩大于基准样; SAP可以显著的延长水泥净浆圆环开裂时间,但是SAP和陶粒对混凝土平板抗裂性能改善作用不明显。掺加SAP和陶粒对混凝土抗渗性能影响较小,掺SAP的混凝土抗冻性能明显差于基准混凝土的。
The effect of SAP on mortar paste compressive strength,early-age crack resistance and dry shrinkage were discussed. And the effect of SAP and ceramsite on concrete workability,early-age crack resistance,comprehensive strength,volume stability and durability were studied. The results show that adding with SAP or ceramsite would induce the concrete unit water consumption increasing at some degrees,meanwhile,it would induce the compressive strength and ultimate tensile strain reducing at some degrees. The values of dry shrinkage concrete of adding with SAP or ceramsite are less than the benchmark specimen at the early hydration,however the values are beyond the benchmark specimen at the later hydration. SAP could significantly prolong the cracking time of cement paste circular ring,but the effect of SAP and ceramsite improving crack resistance of concrete plate are not obvious. The effect of SAP and ceramsite on concrete impervious performance are very slight. The frost-resistant performance of concrete with is significantly worse than the reference concrete.
The effect of SAP on mortar paste compressive strength,early-age crack resistance and dry shrinkage were discussed. And the effect of SAP and ceramsite on concrete workability,early-age crack resistance,comprehensive strength,volume stability and durability were studied. The results show that adding with SAP or ceramsite would induce the concrete unit water consumption increasing at some degrees,meanwhile,it would induce the compressive strength and ultimate tensile strain reducing at some degrees. The values of dry shrinkage concrete of adding with SAP or ceramsite are less than the benchmark specimen at the early hydration,however the values are beyond the benchmark specimen at the later hydration. SAP could significantly prolong the cracking time of cement paste circular ring,but the effect of SAP and ceramsite improving crack resistance of concrete plate are not obvious. The effect of SAP and ceramsite on concrete impervious performance are very slight. The frost-resistant performance of concrete with is significantly worse than the reference concrete.
引文
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[12]韩宇栋,张君,王振波.预吸水轻骨料对高强混凝土早期收缩的影响[J].硅酸盐学报,2013,41(8):1070-1078.
[13]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):559-571.
[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):1009-1110.
[3]崔艳玲,薛飞,崔建世.混凝土内养护技术研究现状[J].河南建材,2016(4):214-216.
[4]王发洲,吴文选,周宇飞,等.预湿轻集料与高吸水性树脂的内养护效果比较[J].武汉理工大学学报,2010,32(14):21-25.
[5] Jensen O M,Hansen P F. Water-entrained cement-based materials I. Principles and theoretical background[J]. Cement and Concrete Research,2001,31:647-654.
[6]董淑慧,张宝生,葛勇,等.轻骨料对混凝土自养护减缩效率的影响[J].硅酸盐学报,2009,37(3):465-469.
[7] Wei Y,Xiang Y,Zhang Q. Internal curing efficiency of prewetted LWFAs on concrete humidity and autogenous shrinkage development[J].Journal of Materials in Civil Engineering,2014,26(5):947-954.
[8] Cusson D,Hoogeveen T. Internal curing of high performance concrete with pre-soaked fine lightweight aggregate for prevention of autogenous shrinkage cracking[J]. Cement and Concrete Research,2008,38(6):757-765.
[9]韩松,安明喆,郭瑞,等.陶粒内养护高性能混凝土抗裂性能研究[J].建筑材料学报,2015,18(5):742-748.
[10] Kovler K,Souslikov A,Bentur A. Pre-soaked lightweight aggregates as additives for internal curing of high strength concretes[J]. Cement Concrete and Aggregates,2004,26(2):131-138.
[11]魏亚,郑小波,郭为强.干燥环境下内养护混凝土收缩、强度及开裂性能[J].建筑材料学报,2016,19(5):902-908.
[12]韩宇栋,张君,王振波.预吸水轻骨料对高强混凝土早期收缩的影响[J].硅酸盐学报,2013,41(8):1070-1078.
[13]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):559-571.