高强度水泥基灌浆料基本力学性能正交试验研究
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摘要
选用32. 5R复合硅酸盐水泥作为主要胶凝材料,通过正交试验,研究了水胶比、胶砂比、粉煤灰、硅灰、膨胀剂和减水剂对水泥基灌浆料基本力学性能的影响,涉及到的主要性能指标为灌浆料的初始和30min流动度、7d和28d抗压及抗折强度。试验结果表明:水胶比和胶砂比对水泥基灌浆料的综合性能影响最为显著,减水剂的影响作用较小;粉煤灰、硅灰对其流动度及28d强度影响较大;膨胀剂对其7d强度影响较大,尤其是抗折强度,对其他性能的影响不显著;以水泥基灌浆料28d高强度为目标,较大流动度为条件,得到优化的最佳因素水平组合为A2B2C1D3E2F2,即水胶比为0. 34、胶砂比为1∶1. 2、粉煤灰掺量为15%、硅灰掺量为8%、膨胀剂掺量为10%、减水剂掺量为1. 00%。
The 32. 5 R composite Portland cement was selected as the main cementitious material. The influences of ratio of water-to-binder ratio,mortar-to-cement ratio,fly ash,silica fume,expansion agent and water reducing agent on basic mechanical properties of cement-based grouting material were studied by orthogonal test. The main performance indicators involved were the initial and 30 min fluidity of the grouting material,the 7 d and 28 d compressive and flexural strengths.The test results show that the water-to-binder ratio and mortar-to-cement ratio have the most significant effect on the comprehensive performance of cement-based grouting material,and the effect of water reducing agent is smaller; fly ash and silica fume have greater influence on fluidity and 28 d strength; the water reducing agent has a great influence on the 7 d strength,especially the flexural strength,and its effect on other properties is not significant; with the 28 d high strength of cement-based grouting material as the target and the large fluidity as the condition,the optimal combination of the best factors is A2 B2 C1 D3 E2 F2,that is,the water-to-binder ratio is 0. 34,the mortar-to-cement ratio is 1 ∶1. 2,and the fly ash content is 15%,the amount of silica fume is 8%,the amount of expansion agent is 10%,and the amount of water reducing agent is 1. 00%.
The 32. 5 R composite Portland cement was selected as the main cementitious material. The influences of ratio of water-to-binder ratio,mortar-to-cement ratio,fly ash,silica fume,expansion agent and water reducing agent on basic mechanical properties of cement-based grouting material were studied by orthogonal test. The main performance indicators involved were the initial and 30 min fluidity of the grouting material,the 7 d and 28 d compressive and flexural strengths.The test results show that the water-to-binder ratio and mortar-to-cement ratio have the most significant effect on the comprehensive performance of cement-based grouting material,and the effect of water reducing agent is smaller; fly ash and silica fume have greater influence on fluidity and 28 d strength; the water reducing agent has a great influence on the 7 d strength,especially the flexural strength,and its effect on other properties is not significant; with the 28 d high strength of cement-based grouting material as the target and the large fluidity as the condition,the optimal combination of the best factors is A2 B2 C1 D3 E2 F2,that is,the water-to-binder ratio is 0. 34,the mortar-to-cement ratio is 1 ∶1. 2,and the fly ash content is 15%,the amount of silica fume is 8%,the amount of expansion agent is 10%,and the amount of water reducing agent is 1. 00%.
引文
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[2]张巨松,李宗阳,张娜,等.水泥基灌浆料工作性的实验[J].沈阳建筑大学学报(自然科学版),2013,29(6):1072-1077.
[3] JOSEPH J ASSAAD,YEHIA DAOU. Cementitious grouts with adapted rheological properties for injection by vacuum techniques[J]. Cement&Concrete Research,2014,59(5):43-54.
[4]吴元,王凯,杨晓婧,等.水泥基灌浆料基本力学性能试验研究[J].建筑结构,2014,44(19):95-98.
[5]袁广林,李青,李庆涛,等.高性能水泥基灌浆料高温后抗压强度退化规律[J].建筑材料学报,2014,17(3):470-474.
[6] ROQUE BORINAGA-TREVIO, PABLO PASCUALMUOZ,MIGUELNGEL CALZADA-PREZ,et al.Freeze-thaw durability of cement-based geothermal grouting materials[J]. Construction&Building Materials,2014,55(3):390-397.
[7] INDACOECHEA-VEGA I, P PASCUAL-MUOZ,CASTRO-FRESNO D,et al. Experimental characterization and performance evaluation of geothermal grouting materials subjected to heating-cooling cycles[J].Construction&Building Materials,2015,98:583-592.
[8]李国忠,张水.聚合物水泥基灌浆材料的性能研究[J].建筑材料学报,2010,31(6):744-748.
[9] HE Z,LI Q,WANG J,et al. Effect of silane treatment on the mechanical properties of polyurethane/water glass grouting materials[J]. Construction&Building Materials,2016,116:110-120.
[10]钟世云,刘应刁,王培铭.聚合物改性特种水泥灌浆料的性能[J].建筑材料学报,2004,7(1):102-108.
[11]黄振宇,钱峰. DSP早强高强灌浆料综合性能研究[J].湖南大学学报(自然科学版),2009,36(8):18-22.
[12] ANAGNOSTOPOULOS C A. Effect of different superplasticisers on the physical and mechanical properties of cement grouts[J]. Construction&Building Materials,2014,50(1):162-168.
[13] LIM S K,TAN C S,CHEN K P,et al. Effect of different sand grading on strength properties of cement grout[J].Construction&Building Materials,2013,38(1):348-355.
[14]水泥胶砂流动度测定方法:GB/T 2419—2005[S].北京:中国标准出版社,2005.
[15]水泥砂强胶度检验方法:GB/T 17671—1999[S].北京:中国标准出版社,1999.