全免蒸养蒸压PHC管桩专用多功能减水剂的制备与性能研究
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摘要
以马来酸酐、丙烯酸羟乙酯、苯乙烯、过氧化苯甲酰、亚硫酸氢钠、丙酮、氢氧化钠、消泡剂、降粘剂、引气剂等原材料制备全免蒸养蒸压PHC管桩专用多功能减水剂,并对其进行了性能研究和微观分析。结果表明,该减水剂具有高减水、快分散、低黏性、超早强等特性,可满足PHC管桩对混凝土工作性能及强度的要求,免去了PHC管桩混凝土常压蒸养和高温蒸压的传统养护工艺。XRD分析表明,该种多功能减水剂的加入促进了水泥的水化,水化产物与蒸养蒸压PHC管桩混凝土并没有明显的差异;SEM分析结果显示,全免蒸养蒸压PHC管桩混凝土中骨料与水泥水化产物晶体界面结合较为紧密,整体结构较为致密。
Multifunctional water reducing agent specially used in steaming-free autoclaved PHC pipe piles was prepared with maleic anhydride,hydroxyethyl acrylate, styrene, benzoyl peroxide,sodium bisulfite,acetone,sodium hydroxide,defoamers,viscosity reducing agents and other raw materials,and performance study and a micro test analysis were conducted. The results show that the water reducing agent has high water reduction,fast dispersion,low viscosity,super early strength and other characteristics,meeting the requirements of PHC pipe piles on the performance and strength of concrete,without traditional curing process of atmospheric pressure steam curing and high temperature autoclaving of PHC pipe pile concrete. XRD analysis showed that the addition of such special water-reducing agent promoted the full hydration of the cement. There was no significant difference between the hydration products and that of steaming autoclaved reinforced concrete. Scanning electron microscopy results showed that the aggregate in steaming-free autoclaved PHC pipe piles concrete is closedly combined with cement hydration product crystal interface,the overall structure is more dense.
Multifunctional water reducing agent specially used in steaming-free autoclaved PHC pipe piles was prepared with maleic anhydride,hydroxyethyl acrylate, styrene, benzoyl peroxide,sodium bisulfite,acetone,sodium hydroxide,defoamers,viscosity reducing agents and other raw materials,and performance study and a micro test analysis were conducted. The results show that the water reducing agent has high water reduction,fast dispersion,low viscosity,super early strength and other characteristics,meeting the requirements of PHC pipe piles on the performance and strength of concrete,without traditional curing process of atmospheric pressure steam curing and high temperature autoclaving of PHC pipe pile concrete. XRD analysis showed that the addition of such special water-reducing agent promoted the full hydration of the cement. There was no significant difference between the hydration products and that of steaming autoclaved reinforced concrete. Scanning electron microscopy results showed that the aggregate in steaming-free autoclaved PHC pipe piles concrete is closedly combined with cement hydration product crystal interface,the overall structure is more dense.
引文
[1]赵鹏飞,廖国胜,杨海波.PHC管桩混凝土全免压蒸制备工艺研究[J].新型建筑材料,2017,44(2):103-106
[2]郭德生,张瑞红,王楠,等.管桩行业能耗特点与节能减排途径[J].节能,2011,30(3):13-16.
[3]胡若邻,苏林王,林美鸿.预应力高强混凝土管桩制作中预应力状态的试验研究[J].工业建筑,2013,43(6):90-94,116.
[4]苟德胜,李斌斌.免蒸压无余浆混凝土预制桩关键技术的研发与应用[J].混凝土,2013(3):111-114.
[5]赵世煜.免蒸汽养护PHC管桩混凝土的关键技术研究[D].南京:东南大学,2017.
[6]马双平,周芬,朱华雄.减水剂表面活性及作用机理[J].商品混凝土,2014(6):34-36.
[7]周智密.超支化聚合物的合成及减水性能研究[D].西安:长安大学,2015.
[8]杨建森.混凝土中钙矾石作用的二重性[J].建筑材料学报,2001,4(4):362-366.
[9]焦志强.托勃莫来石型硅酸钙[J].中国建材,1995(12):39-44.
[10]纪爱民,任伟记,李名远.预应力高强混凝土管桩工艺技术及发展[J].混凝土与水泥制品,2012(4):30-35.
[11] Mehmet G.Lnfluence of steam curing on the properties of concretes incorporating meta-kaolin ands ilicafume[J].Materials And Structures,2010,43:1123-1134.
[12] Ba M F,Qian C X,Guo X J,et al.Effects of steam curing on strength and porous structure of concrete with low water/binder ratio[J].Construction and Building Materials,2011,5(1):123-128.
[2]郭德生,张瑞红,王楠,等.管桩行业能耗特点与节能减排途径[J].节能,2011,30(3):13-16.
[3]胡若邻,苏林王,林美鸿.预应力高强混凝土管桩制作中预应力状态的试验研究[J].工业建筑,2013,43(6):90-94,116.
[4]苟德胜,李斌斌.免蒸压无余浆混凝土预制桩关键技术的研发与应用[J].混凝土,2013(3):111-114.
[5]赵世煜.免蒸汽养护PHC管桩混凝土的关键技术研究[D].南京:东南大学,2017.
[6]马双平,周芬,朱华雄.减水剂表面活性及作用机理[J].商品混凝土,2014(6):34-36.
[7]周智密.超支化聚合物的合成及减水性能研究[D].西安:长安大学,2015.
[8]杨建森.混凝土中钙矾石作用的二重性[J].建筑材料学报,2001,4(4):362-366.
[9]焦志强.托勃莫来石型硅酸钙[J].中国建材,1995(12):39-44.
[10]纪爱民,任伟记,李名远.预应力高强混凝土管桩工艺技术及发展[J].混凝土与水泥制品,2012(4):30-35.
[11] Mehmet G.Lnfluence of steam curing on the properties of concretes incorporating meta-kaolin ands ilicafume[J].Materials And Structures,2010,43:1123-1134.
[12] Ba M F,Qian C X,Guo X J,et al.Effects of steam curing on strength and porous structure of concrete with low water/binder ratio[J].Construction and Building Materials,2011,5(1):123-128.