流变混凝土骨料运动模拟试验研究
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摘要
用卡波姆凝胶配制与流变混凝土浆体流变性能等效的透明浆体,通过可视化物模试验模拟得到流变混凝土骨料的运动规律.基于真实与模拟介质流动图像、振动骨料分布实时一致性原则,分析了拌和物流动过程形变、振动骨料沉降特点及其形成机理.结果表明:流变混凝土基于等效流变性能的可视化模拟方法独特可行,可直观获取骨料沉降运动规律以及速度场、位移场等运动形态参数,为进一步研究流变混凝土的本构关系及颗粒接触模型提供基础.
Visual physical model experiment of aggregates motion law were carried out via transparent adhesive prepared from carbomer gel with equivalent rheological properties of fresh concrete.Based on the principle of consistency in both real-time image of flow process and real aggregate distribution from fresh mortar and transparent adhesive,the mechanism of rheological deformation of mortar and aggregate settling characteristics forced vibration was analyzed.Results indicate that visual simulation method of fresh concrete based on equivalent rheological properties is unique and feasible,and from the experiments the aggregates settlement motion law i.e.,displacement fields,velocity fields and other motion morphological parameters can be directly obtained,which provide vital foundation on the analysis of constitutive relationship and grain contact model of rheological concrete.
Visual physical model experiment of aggregates motion law were carried out via transparent adhesive prepared from carbomer gel with equivalent rheological properties of fresh concrete.Based on the principle of consistency in both real-time image of flow process and real aggregate distribution from fresh mortar and transparent adhesive,the mechanism of rheological deformation of mortar and aggregate settling characteristics forced vibration was analyzed.Results indicate that visual simulation method of fresh concrete based on equivalent rheological properties is unique and feasible,and from the experiments the aggregates settlement motion law i.e.,displacement fields,velocity fields and other motion morphological parameters can be directly obtained,which provide vital foundation on the analysis of constitutive relationship and grain contact model of rheological concrete.
引文
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[3]ROUSSEL N.Correlation between yield stress and slump:Comparison between numerical simulations and concrete rheometers results[J].Materials and Structures,2006,39(4):501-509.
[4]KHAYAT K H,GUIZANI Z.Use of viscosity-modifying admixture to enhance stability of fluid concrete[J].ACI Mater J,1997,94(3):332-340.
[5]ROLS S,JEAN A,JEAN P.Effects of different viscosity agents on the properties of self-levelling concrete[J].Cement and Concrete Research,1999,29(2):261-266.
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[7]GOLASZEWSKI J,SZWABOWSKI J.Influence of superplasticizers on rheological behaviour of fresh cement mortars[J].Cement and Concrete Research,2004,34(2):235-248.
[8]AIAD I.Influence of time addition of superplasticizers on the rheological properties of fresh cement pastes[J].Cement and Concrete Research,2003,33(8):1229-1234.
[9]MURATA J,SUZUKI K.New method of testing the flowability of grout[J].Magazine of Concrete Research,1997,181(49):269-276.
[10]田正宏,李旭航,彭志海.卡波姆凝胶模拟水泥浆体流变性能试验[J].建筑材料学报,2015,18(2):243-248.TIAN Zhenghong,LI Xuhang,PENG Zhihai.Test of carbomer gel to simulate the rheological performance of cement paste[J].Journal of Building Materials,2015,18(2):243-248.(in Chinese)
[11]NGUYEN T L H,ROUSSEL N,COUSSOT P.Correlation between L-box test and rheological parameters of a homogeneous yield stress fluid[J].Cement and Concrete Research,2006,36(10):1789-1796.
[12]PETROU M,WAN B,GARDALA-MARIA F,et al.Influence of mortar rheology on aggregate settlement[J].ACI Materials Journal,2000,97(4):479-485.
[13]SAFAWI M I,IWAKI I.The segregation tendency in the vibration of high fluidity concrete[J].Cement and Concrete Research,2004,34(2):219-226.
[14]BERIS A N,TSAMOPOULOS J A,ARMSTRONG R C,et al.Creeping motion of a sphere through a Bingham plastic[J].Journal of Fluid Mechanics,1985,158(16):219-244.
[2]PURI U C,UOMOTO T.Characterization of distinct element modeling parameters for fresh concrete and its application in shotcrete simulations[J].Journal of Materials in Civil Engineering,2002,14(2):137-144.
[3]ROUSSEL N.Correlation between yield stress and slump:Comparison between numerical simulations and concrete rheometers results[J].Materials and Structures,2006,39(4):501-509.
[4]KHAYAT K H,GUIZANI Z.Use of viscosity-modifying admixture to enhance stability of fluid concrete[J].ACI Mater J,1997,94(3):332-340.
[5]ROLS S,JEAN A,JEAN P.Effects of different viscosity agents on the properties of self-levelling concrete[J].Cement and Concrete Research,1999,29(2):261-266.
[6]MOODY J,DARKEN C J.Fast learning in networks of locally-tuned processing units[J].Neural Computation,1989,1(2):281-294.
[7]GOLASZEWSKI J,SZWABOWSKI J.Influence of superplasticizers on rheological behaviour of fresh cement mortars[J].Cement and Concrete Research,2004,34(2):235-248.
[8]AIAD I.Influence of time addition of superplasticizers on the rheological properties of fresh cement pastes[J].Cement and Concrete Research,2003,33(8):1229-1234.
[9]MURATA J,SUZUKI K.New method of testing the flowability of grout[J].Magazine of Concrete Research,1997,181(49):269-276.
[10]田正宏,李旭航,彭志海.卡波姆凝胶模拟水泥浆体流变性能试验[J].建筑材料学报,2015,18(2):243-248.TIAN Zhenghong,LI Xuhang,PENG Zhihai.Test of carbomer gel to simulate the rheological performance of cement paste[J].Journal of Building Materials,2015,18(2):243-248.(in Chinese)
[11]NGUYEN T L H,ROUSSEL N,COUSSOT P.Correlation between L-box test and rheological parameters of a homogeneous yield stress fluid[J].Cement and Concrete Research,2006,36(10):1789-1796.
[12]PETROU M,WAN B,GARDALA-MARIA F,et al.Influence of mortar rheology on aggregate settlement[J].ACI Materials Journal,2000,97(4):479-485.
[13]SAFAWI M I,IWAKI I.The segregation tendency in the vibration of high fluidity concrete[J].Cement and Concrete Research,2004,34(2):219-226.
[14]BERIS A N,TSAMOPOULOS J A,ARMSTRONG R C,et al.Creeping motion of a sphere through a Bingham plastic[J].Journal of Fluid Mechanics,1985,158(16):219-244.