消泡剂对掺萘系减水剂砂浆性能的影响研究
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摘要
通过消泡剂在不同掺量下对掺萘系减水剂(NSF)砂浆的含气量、扩展度、强度及压折比的影响试验,考察了4种消泡剂与NSF的相容性。结果表明:消泡剂在掺NSF砂浆中的作用效果与其种类和掺量有关;一般而言,消泡剂会降低掺NSF砂浆的含气量,改善其流动性,提高强度并降低压折比;消泡效果较好的消泡剂对掺NSF砂浆的流动性和强度的改善效果也相应较好。
Through the test of effect of defoamer in different dosage on air content,slump flow,strength and the ratio of compressive strength to flexural strength of mortar mixed with naphthalene superplasticizer(NSF),studied the compatibility of four kinds of defoamer and NSF. Results show that,the effects of defoamer in mortar mixed with NSF is related to the kinds and amounts of defoamer. Generally,defoamer can reduce the air content of mortar mixed with NSF,improve the fluidity,increase the strength and reduce the ratio of compressive strength to flexural strength,and the defoamer with a good defoaming effect usually has a better improvement on mortar flow and strength of mortar mixed with NSF.
Through the test of effect of defoamer in different dosage on air content,slump flow,strength and the ratio of compressive strength to flexural strength of mortar mixed with naphthalene superplasticizer(NSF),studied the compatibility of four kinds of defoamer and NSF. Results show that,the effects of defoamer in mortar mixed with NSF is related to the kinds and amounts of defoamer. Generally,defoamer can reduce the air content of mortar mixed with NSF,improve the fluidity,increase the strength and reduce the ratio of compressive strength to flexural strength,and the defoamer with a good defoaming effect usually has a better improvement on mortar flow and strength of mortar mixed with NSF.
引文
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[8]Joshi K S,Braumann A,Jeelani S A K,et al.Mechanism of bubble coalescence induced by surfactant covered antifoam particles[J].Journal of Colloid and Interface Sci.,2009,339(2):446-453.
[9]熊浩东.水泥砂浆中消泡剂的应用性能研究[J].商品混凝土,2013(6):44-46,67.
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[11]刘小兵.水泥基无收缩灌浆砂浆的配制及性能研究[D].重庆:重庆大学,2010.
[2]李英丁,李玉香,宋子健.建筑添加剂对厚层石膏基自流平砂浆性能影响研究[J].新型建筑材料,2015(11):11-14.
[3]郑娟荣,赵雪飞.减水剂对干混砂浆中粉状组成分散性的对比试验研究[J].混凝土,2014(6):115-117.
[4]Shi Chen,Zhang Ge,He Tingshu,et al.Effects of superplasticizers on the stability and morphology of ettringite[J].Construction and Building Materials,2016,112(6):261-266.
[5]Li Leo G,Kwan Albert K H.Effects of superplasticizer type on packing density,water film thickness and flowability of cemen titious paste[J].Construction and Building Materials,2015,86(3):113-119.
[6]Jiang Jinyang,She Wei,Li Wei,et al.Effect of functional chemical admixtures on the performance of cement asphalt mortar used in ballastless track[J].Journal of Wuhan University of Technology,2015,30(5):995-1000.
[7]Parveen Shama,Rana Sohel,Fangueiro Raul,et al.Microstructure and mechanical properties of carbon nanotube reinforced cementitious composites developed using a novel dispersion technique[J].Cement and Concrete Research,2015,73(3):215-227.
[8]Joshi K S,Braumann A,Jeelani S A K,et al.Mechanism of bubble coalescence induced by surfactant covered antifoam particles[J].Journal of Colloid and Interface Sci.,2009,339(2):446-453.
[9]熊浩东.水泥砂浆中消泡剂的应用性能研究[J].商品混凝土,2013(6):44-46,67.
[10]赵昕南.用砂浆扩展度法确定高效减水剂最佳掺量[J].商品混凝土,2007(6):14-16.
[11]刘小兵.水泥基无收缩灌浆砂浆的配制及性能研究[D].重庆:重庆大学,2010.