|Table of Contents|

Fracture Properties of Shale Lightweight Aggregate Concrete After High Temperature(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2019年04期
Page:
120-126
Research Field:
Publishing date:

Info

Title:
Fracture Properties of Shale Lightweight Aggregate Concrete After High Temperature
Author(s):
ZHANG Yun-guo;  CHEN Ting-ting;  LI Min
(School of Civil Engineering, Dalian Jiaotong University, Dalian 116028, Liaoning, China)
Keywords:
lightweight aggregate concrete;  high temperature;  three-point bending beam method;  fracture energy;  fracture toughness
PACS:
TU528.01
DOI:
-
Abstract:
In order to study the temperature effect on modeⅠfracture properties of shale lightweight aggregate concrete,the shale lightweight aggregate concrete specimens were heated at 100, 200, 300, 400 ℃ and then naturally cooled to room temperature. Three-point bending beam method was used to the fracture test for 15 lightweight aggregate concrete beams with seam-height ratio of 0.4. The fracture energy and fracture toughness were calculated according to the load-midspan deflection curves. The results show that the initiation toughness and the unstable toughness both rise firstly and then drop with the increase of temperature. The turning point of the initiation toughness is at about 200 ℃, and that of the unstable toughness is at about 300 ℃. The cohesion toughness shows a decrease-increase-decrease trend with elevated temperatures, and is largely related to the initiation and the unstable toughness. The cohesion force of crack tip significantly prevents crack extension at about 300 ℃. The fracture energy presents a hold-rise-decline three-stage and reaches the maximum value at about 200 ℃. The ascending part of the fitting curve of the fracture energy changing with temperature is a quadratic parabola and the descending part is a straight line. Within the temperature range of the study, the fracture behavior of shale lightweight aggregate concrete affected by high temperature is notable. It provides experimental basis for the study of crack propagation and structural design of lightweight aggregate concrete under high temperature condition.

References:

[1] 王建民,袁丽莉,汪能君,等.高温加热后轻骨料混凝土力学性能实验研究[J].自然灾害学报,2014,23(1):258-263.
WANG Jian-min,YUAN Li-li,WANG Neng-jun,et al.Experimental Study on Mechanical Performance of Lightweight Aggregate Concrete After High Temperature Heating[J].Journal of Natural Disasters,2014,23(1):258-263.
[2]吴 熙,江佳斐,范兴朗,等.自密实轻骨料混凝土的高温性能[J].材料科学与工程学报,2014,32(3):313-317.
WU Xi,JIANG Jia-fei,FAN Xing-lang,et al.Thermal Behavior of Self-compacting Lightweight Concrete Subjected to the Elevated Temperature[J].Journal of Materials Science & Engineering,2014,32(3):313-317.
[3]郭荣鑫,何科成,马倩敏,等.改性轻骨料混凝土高温抗压性能及微观结构[J].建筑材料学报,2017,20(3):333-338,344.
GUO Rong-xin,HE Ke-cheng,MA Qian-min,et al.Compressive Properties and Microstructure of Modified Lightweight Aggregate Concrete After Exposure to Elevated Temperatures[J].Journal of Building Materials,2017,20(3):333-338,344.
[4]吴 熙,付腾飞,吴智敏.自密实轻骨料混凝土的双K断裂参数和断裂能试验研究[J].工程力学,2010,27(增2):249-254.
WU Xi,FU Teng-fei,WU Zhi-min.Experimental Study on Double-K Fracture Parameters and Fracture Energy of Self-compacting Lightweight Concrete[J].Engineering Mechanics,2010,27(S2):249-254.
[5]吴 熙,范兴朗,吴智敏.自密实轻骨料混凝土断裂全过程分析[J].水利水电科技进展,2014,34(6):36-39,44.
WU Xi,FAN Xing-lang,WU Zhi-min.Analysis of Crack Propagation in Self-compacting Lightweight Concrete[J].Advances in Science and Technology of Water Resources,2014,34(6):36-39,44.
[6]ABDEL-FATTAH H,HAMOUSH S A.Variation of the Fracture Toughness of Concrete with Temperature[J].Construction and Building Materials,1997,11(2):105-108.
[7]BAKER G.The Effect of Exposure to Elevated Temperatures on the Fracture Energy of Plain Concrete[J].Materials and Structures,1996,29(6):383-388.
[8]NIELSEN C V,BICANIC N.Residual Fracture Energy of High-performance and Normal Concrete Subject to High Temperatures[J].Materials and Structures,2003,36(8):515-521.
[9]ZHANG B,BICANIC N.Fracture Energy of High-performance Concrete at High Temperatures Up to 450 ℃:The Effects of Heating Temperatures and Testing Conditions(Hot and Cold)[J].Magazine of Concrete Research,2006,58(5):277-288.
[10]WATANABE K,BANGI M R,HORIGUCHI T.Effect of Elevated Temperatures on Flexural Behaviour of Hybrid Fibre Reinforced High Strength Concrete[J].Journal of Structural Fire Engineering,2010,1(1):17-27.
[11]WATANABE K,BANGI M R,HORIGUCHI T.The Effect of Testing Conditions(Hot and Residual)on Fracture Toughness of Fiber Reinforced High-strength Concrete Subjected to High Temperatures[J].Cement and Concrete Research,2013,51:6-13.
[12]陆洲导,俞可权,苏 磊,等.高温后混凝土断裂性能研究[J].建筑材料学报,2012,15(6):836-840,846.
LU Zhou-dao,YU Ke-quan,SU Lei,et al.Residual Fracture Behaviors of Concrete Subjected to Elevated Temperatures[J].Journal of Building Materials,2012,15(6):836-840,846.
[13]商兴艳,俞可权,陆洲导.高温后混凝土断裂能的确定[J].中南大学学报:自然科学版,2014,45(2):589-595.
SHANG Xing-yan,YU Ke-quan,LU Zhou-dao.Determination of Residual Fracture Energy of Concrete Subjected to Elevated Temperature[J].Journal of Central South University:Science and Technology,2014,45(2):589-595.
[14]俞可权,陆洲导,唐安静.高温后混凝土断裂全过程的裂缝扩展阻力曲线[J].浙江大学学报:工学版,2013,47(4):588-594.
YU Ke-quan,LU Zhou-dao,TANG An-jing.Residual Crack Extension Resistance During Complete Fracture Process of Post-fire Concrete[J].Journal of Zhejiang University:Engineering Science,2013,47(4):588-594.
[15]闫 昕,杜红秀,金 鑫.温度对C40高性能混凝土断裂能的影响[J].混凝土,2016(6):12-14.
YAN Xin,DU Hong-xiu,JIN Xin.Effect of Temperature on Fracture Energy of C40 High Performance Concrete[J].Concrete,2016(6):12-14.
[16]JGJ 51—2002,轻骨料混凝土技术规程[S].
JGJ 51—2002,Technical Specification for Lightweight Aggregate Concrete[S].
[17]黄兴震.混凝土断裂力学试验研究测量方法的对比分析[J].科学技术创新,2017(26):92-93.
HUANG Xing-zhen.Comparison and Analysis on Test Methods for Fracture Mechanics of Concrete[J].Scientific and Technological Innovation,2017(26):92-93.
[18]徐世烺,赵国藩.混凝土结构裂缝扩展的双K断裂准则[J].土木工程学报,1992,25(2):32-38.
XU Shi-lang,ZHAO Guo-fan.A Double-K Fracture Criterion for the Crack Propagation in Concrete Structures[J].China Civil Engineering Journal,1992,25(2):32-38.

Memo

Memo:
-
Last Update: 2019-07-26