泡沫混凝土及其复合墙体热工性能的研究
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摘要
采用操作更简单的化学现浇工艺手段,将泡沫混凝土浇筑于新型泡沫混凝土轻钢龙骨复合墙体中。研究含水量以及聚苯颗粒粒径对泡沫混凝土保温性能的影响,并通过模拟计算选择出满足节能要求的泡沫混凝土材料。研究结果表明:泡沫混凝土含水量对导热系数影响较大,且随材料干密度增大其影响越明显,并根据经自然养护28d后泡沫混凝土在自然与烘干条件下的导热系数比较,得出导热系数的修正系数为1. 002;改变聚苯颗粒粒径对泡沫混凝土导热系数影响较小,但掺加小粒径聚苯颗粒可以提高抗压强度,降低吸水率;利用有限元ABAQUS软件模拟墙体热工性能,最终得出泡沫混凝土导热系数与其浇筑厚度的对应关系。
The foamed concrete was poured into the new type of foamed concrete light steel keel composite wall by using a simpler chemical casting process. The effects of water content and particle size of polystyrene particles to the thermal insulation property of foamed concrete were studied,and the materials meeting the energy saving requirements were selected through simulating computation. The results show that the water content of foamed concrete has a great influence on the thermal conductivity and this effect becomes more obvious with the increase of material dry density. Based on the thermal conductivity of foamed concrete in natural and drying conditions after 28 d natural curing,it can be calculated that the correction factor of thermal conductivity is 1. 002. Changing the particle size of polystyrene particles have little effect on thermal conductivity of foamed concrete but the corporation of the small particle size can increase compressive strength and reduce water absorption. Moreover,the thermal performance of wall is simulated by finite element software ABAQUS and the corresponding relationship between the thermal conductivity of foamed concrete and its pouring thickness is obtained.
The foamed concrete was poured into the new type of foamed concrete light steel keel composite wall by using a simpler chemical casting process. The effects of water content and particle size of polystyrene particles to the thermal insulation property of foamed concrete were studied,and the materials meeting the energy saving requirements were selected through simulating computation. The results show that the water content of foamed concrete has a great influence on the thermal conductivity and this effect becomes more obvious with the increase of material dry density. Based on the thermal conductivity of foamed concrete in natural and drying conditions after 28 d natural curing,it can be calculated that the correction factor of thermal conductivity is 1. 002. Changing the particle size of polystyrene particles have little effect on thermal conductivity of foamed concrete but the corporation of the small particle size can increase compressive strength and reduce water absorption. Moreover,the thermal performance of wall is simulated by finite element software ABAQUS and the corresponding relationship between the thermal conductivity of foamed concrete and its pouring thickness is obtained.
引文
[1]李猛,黄寅生,张少波,等.泡沫混凝土的研究进展及展望[J].材料导报:纳米与新材料专辑,2016(1):402-405.
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[4]李应权,徐洛屹,王明轩,等.A级防火泡沫混凝土保温板[J].新型建筑材料,2012(2):69-71.
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[6]沈涛,宋来忠,孙艳海.基于细观尺度的泡沫混凝土热性能研究[J].材料导报,2013,27(22):155-159.
[7]Osanyintola O F,Simonson C J.Moisture buffering capacity of hygroscopic building materials:Experimental facilities and energy impact[J].Energy&Buildings,2006,38(10):1270-1282.
[8]Shin H C,Kodide U.Thermal conductivity of ternary mixtures for concrete pavements[J].Cement&Concrete Composites,2012,34(4):575-582.
[9]Suchorab Z,Barnat-Hunek D,Sobczuk H.Influence of moisture on heat conductivity coefficient of aerated concrete[J].Ecoogical Chemistry and Engineering S,2011,18(1):111-120.
[10]Sayadi A A,Tapia J V,Neitzert T R,et al.Effects of expanded polystyrene(EPS)particles on fire resistance,thermal conductivity and compressive strength of foamed concrete[J].Construction&Building Materials,2016,112:716-724.
[11]鲁永明,何纯涛,信会鹏,等.现浇泡粒混凝土的配制及其性能研究[J].混凝土,2014(6):147-150.
[12]DB13(J)185-2015,河北省工程建设标准[S].
[13]贾艳涛,杨永敢.泡沫混凝土性能试验研究[J].硅酸盐通报,2016,35(9):2804-2809.
[14]Hall M,Allinson D.Assessing the effects of soil grading on the moisture content-dependent thermal conductivity of stabilised rammed earth materials[J].Applied Thermal Engineering,2009,29(4):740-747.
[15]王莹莹,马超,刘艳峰,等.含湿量对混凝土导热系数的影响分析[J].建筑材料学报,2018:1-8.
[2]马文军,程瑜,管宗甫.泡沫混凝土用于建筑保温体系的研究进展[J].混凝土世界,2014(11):95-98.
[3]潘玉勤.现浇泡沫混凝土自保温墙体技术在村镇建筑中的应用研究[D].西安:西安建筑科技大学,2015.
[4]李应权,徐洛屹,王明轩,等.A级防火泡沫混凝土保温板[J].新型建筑材料,2012(2):69-71.
[5]谷亚新,王延钊,王小萌.不同工艺泡沫混凝土的研究进展[J].混凝土,2013(12):148-152.
[6]沈涛,宋来忠,孙艳海.基于细观尺度的泡沫混凝土热性能研究[J].材料导报,2013,27(22):155-159.
[7]Osanyintola O F,Simonson C J.Moisture buffering capacity of hygroscopic building materials:Experimental facilities and energy impact[J].Energy&Buildings,2006,38(10):1270-1282.
[8]Shin H C,Kodide U.Thermal conductivity of ternary mixtures for concrete pavements[J].Cement&Concrete Composites,2012,34(4):575-582.
[9]Suchorab Z,Barnat-Hunek D,Sobczuk H.Influence of moisture on heat conductivity coefficient of aerated concrete[J].Ecoogical Chemistry and Engineering S,2011,18(1):111-120.
[10]Sayadi A A,Tapia J V,Neitzert T R,et al.Effects of expanded polystyrene(EPS)particles on fire resistance,thermal conductivity and compressive strength of foamed concrete[J].Construction&Building Materials,2016,112:716-724.
[11]鲁永明,何纯涛,信会鹏,等.现浇泡粒混凝土的配制及其性能研究[J].混凝土,2014(6):147-150.
[12]DB13(J)185-2015,河北省工程建设标准[S].
[13]贾艳涛,杨永敢.泡沫混凝土性能试验研究[J].硅酸盐通报,2016,35(9):2804-2809.
[14]Hall M,Allinson D.Assessing the effects of soil grading on the moisture content-dependent thermal conductivity of stabilised rammed earth materials[J].Applied Thermal Engineering,2009,29(4):740-747.
[15]王莹莹,马超,刘艳峰,等.含湿量对混凝土导热系数的影响分析[J].建筑材料学报,2018:1-8.