Meso-scale Response of Recycled Aggregate Thermal Insulation Concrete Based on Coupled Thermo-mechanical Modeling
[1]MIAO Yanchun,ZHANG Yu,LEI Chuang,et al.Meso-scale Response of Recycled Aggregate Thermal Insulation Concrete Based on Coupled Thermo-mechanical Modeling[J].Journal of Zhengzhou University (Engineering Science),2021,42(05):79-85.[doi:10.13705/j.issn.1671-6833.2021.05.003]
Copy
Journal of Zhengzhou University (Engineering Science)[ISSN
1671-6833/CN
41-1339/T] Volume:
42卷
Number of periods:
2021 05
Page number:
79-85
Column:
Public date:
2021-09-10
- Title:
- Meso-scale Response of Recycled Aggregate Thermal Insulation Concrete Based on Coupled Thermo-mechanical Modeling
- Keywords:
- RATIC; random aggregate model; coupled thermo-mechanical; heat conduction; uniaxial compression; high temperature
- CLC:
- -
- DOI:
- 10.13705/j.issn.1671-6833.2021.05.003
- Abstract:
- Based on the meso-scale heterogeneity of recycled aggregate thermal insulation concrete (RATIC), MATLAB software was used to generate a 2-D polygonal random aggregate model of RATIC by Monte Carlo method, and then the finite element analysis software ABAQUS was used to simulate the uniaxial compression mechanical properties of meso-scale RATIC based on coupled thermo-mechanical modeling. Firstly, the heat conduction behavior of RATIC at different temperatures was simulated. According to the simulation results, the effects of meso-scale constituents at different temperatures (100, 200, 300, 400, 500, 600, 700 and 800 ℃), such as the thermal parameters (conductivity, specific heat and thermal expansion coefficient) and the mechanical parameters (strength, elastic model and Poisson′s ratio), on the meso-scale RATIC mechanical properties were explored. Furthermore, a comparative analysis was conducted to study the uniaxial compression failure modes at different fire temperatures of RATIC under simulated and experimental conditions. The results show that the temperature stress weakens the strength of RATIC when the temperature exceeds 400 ℃. And at 800 ℃, there is a maximum temperature stress of 3.309 MPa generated inside the specimen. The high temperature damage of RATIC specimens under uniaxial compression first appears in the interfacial transition zone, and then develops to the mortar. It is mainly concentrated on the free end of the specimen, and with the increase of the fire temperature and loading time, the damage shows a gradual increase trend. The results indicate that the meso-scale model can be well used to simulate the uniaxial compression mechanical properties and failure patterns of RATIC at high temperature.
- References:
-
[1] BRAVO M,DE BRITO J,PONTES J,et al.Durability performance of concrete with recycled aggregates from construction and demolition waste plants[J].Construction and building materials,2015,77:357-369.[2] 王毋庸. 简述混凝土的细观分析计算模型[J]. 建筑科技与管理, 2011(7):26-26,30.[3] CAGGIANO A,SCHICCHI D S,ETSE G,et al.Meso-scale response of concrete under high temperature based on coupled thermo-mechanical and pore-pressure interface modeling[J].Engineering failure analysis,2018,85:167-188.[4] NGUYEN T D,PHAM D T,VU M N.Thermo-mechanically-induced thermal conductivity change and its effect on the behaviour of concrete[J].Construction and building materials,2019,198:98-105.[5] JIN L,HAO H M,ZHANG R B,et al.Determination of the effect of elevated temperatures on dynamic compressive properties of heterogeneous concrete:a meso-scale numerical study[J].Construction and building materials,2018,188:685-694.[6] 田盼盼,邱洪兴,于江,等.基于3种细观层次再生混凝土骨料模型的对比分析[J].兰州大学学报(自然科学版),2019,55(6):821-827.[7] 刘光廷,王宗敏.用随机骨料模型数值模拟混凝土材料的断裂[J].清华大学学报(自然科学版),1996,36(1):84-89.[8] PELLISSIER G E,PURDY S M.Stereology and quantitative metallography[M].Easton,USA:ASTM International,1972.[9] VOSTEEN H D,SCHELLSCHMIDT R.Influence of temperature on thermal conductivity,thermal capacity and thermal diffusivity for different types of rock[J].Physics and chemistry of the earth,parts A/B/C,2003,28(9/10/11):499-509.
- Similar References:
Memo
-
Last Update:
2021-10-11