Repair of heat damaged reinforced concrete slab with High Strength Fibre Reinforced Concrete materials

4th International Conference on Civil and Environmental Engineering for Sustainability

地球科学;生态环境科学;经济学

Hamiruddin, Nur Ain^1 ; Razak, Rafiza Abd^1 ; Muhammad, Khairunnisa^1 ; Zahid, Muhd Zulham Affendi Mohd^1

Department of Civil Engineering Technology, Faculty of Engineering Technology, Universiti Malaysia Perlis (UniMAP), P.O. Box 77, D/A Pejabat Pos Besar Kangar, Perlis

01000, Malaysia^1

关键词: Center points;    Control samples;    Curing methods;    Fibre reinforced concrete;    Heat damage;    High strength;    Repair materials;    Secant stiffness;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/140/1/012126/pdf
DOI  :  10.1088/1755-1315/140/1/012126

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

The purpose of this study is to investigate the flexural behaviour of heat damaged reinforced concrete (RC) slab by using High Strength Fibre Reinforced Concrete (HSFRC) as repair materials. The slab samples consist of twelve one-way columns heated at 200 °C, 400 °C and 600 °C for 120 minutes. The thickness of the HSFRC layer used to heat damaged slab samples is 40 mm thick. Two distinct curing methods were implement during this study: i.e. normal curing (standard room temperature 26°C) and heat curing (temperature of 90°C for 48 hours). The center-point loading flexural strength test based on ASTM C 293 were referred to examine the flexural strength of the slab samples other than evaluated the mechanical properties of repaired samples (i.e. flexural strength, secant stiffness, toughness and ductility). The HSFRC's results showed that compressive strength at 28 days was 88.66 MPa. Whereas the flexural strength of heat damage repaired samples that exposed to 200°C (R200), 400°C (RNC400) and 400°C (RHC400) were gained by about 3.06% (34.93 MPa), 14.47% (38.79 MPa) and 30.95% (44.38 MPa) respectively, contrasted to the control sample (CS) which is 33.89 MPa. However, heat damage for non-repaired samples that exposed to 200 °C (NR200) and 400°C (NR400) decline by about 0.77% (33.63 MPa) and 8.13% (31.14 MPa) respectively. Therefore, the utilized of HSFRC as repair materials can improve the flexural strength than control sample (CS). This is clearly indicate that HSFRC can enhance the mechanical properties of heat damaged reinforced concrete (RC) slab which can illustrate that the results of flexural behaviour reflected the superiority by using HSFRC as repair materials.