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Agyekum, K, Adinyira, E, Baiden, B, Ampratwum, G and Duah, D (2019) Barriers to the adoption of green certification of buildings. Journal of Engineering, Design and Technology , 17(05), 1035–55.

Al-Saeed, Y, Parn, E, Edwards, D J and Scaysbrook, S (2019) A conceptual framework for utilising BIM digital objects (BDO) in manufacturing design and production. Journal of Engineering, Design and Technology , 17(05), 960–84.

Gamil, Y and Rahman, I A R (2019) Awareness and challenges of building information modelling (BIM) implementation in the Yemen construction industry. Journal of Engineering, Design and Technology , 17(05), 1077–84.

He, W, Shi, Y and Kong, D (2019) Construction of a 5D duration and cost optimisation model based on genetic algorithm and BIM. Journal of Engineering, Design and Technology , 17(05), 929–42.

Hussin, M H, Othman, N H and Wan Ibrahim, M H (2019) Carbonation of concrete containing mussel (Perna viridis) shell ash. Journal of Engineering, Design and Technology , 17(05), 904–28.

Koranteng, C, Simons, B and Essel, C (2019) Climate responsive buildings: a comfort assessment of buildings on KNUST campus, Kumasi. Journal of Engineering, Design and Technology , 17(05), 862–77.

Okojie, D E, Jimoh, A A, Hamam, Y and Yusuff, A A (2019) Optimal capacity utilisation of transmission lines network in power flow operations: a survey. Journal of Engineering, Design and Technology , 17(05), 1056–76.

Owusu-Manu, D, Asiedu, R O, Edwards, D J, Donkor-Hyiaman, K, Abuntori, P A and El-Gohary, H (2019) An assessment of mortgage loan default propensity in Ghana. Journal of Engineering, Design and Technology , 17(05), 985–1017.

Pornthepkasemsant, P and Charoenpornpattana, S (2019) Identification of factors affecting productivity in Thailand’s construction industry and proposed maturity model for improvement of the productivity. Journal of Engineering, Design and Technology , 17(05), 849–61.

Rajabion, L, Wakil, K, Badfar, A, Mojtabavi Naeini, S and Zareie, B (2019) A new model for assessing the impact of ICT and digital knowledge on students’ thoughts and beliefs. Journal of Engineering, Design and Technology , 17(05), 943–59.

Santhosh, C (2019) Impact of determinants on early internationalization. Journal of Engineering, Design and Technology , 17(05), 1018–34.

Thanaraj, D P, N., A and Arulraj, P (2019) Experimental investigation of mechanical properties and physical characteristics of concrete under standard fire exposure. Journal of Engineering, Design and Technology , 17(05), 878–903.

  • Type: Journal Article
  • Keywords: Elevated temperature; Flexural strength; Age of concrete; Grade of concrete;
  • ISBN/ISSN: 1726-0531
  • URL: https://doi.org/10.1108/JEDT-09-2018-0159
  • Abstract:
    This paper aims to explain the influence of Standard Fire as per ISO 834 on the strength and microstructure properties of concrete specimens with different strength grade. Design/methodology/approach The strength grades of concrete considered for the experimental investigation were Fck20, Fck30, Fck40 and Fck50. The specimens were heated up to 1, 2, 3 and 4 h as per standard fire curve. Effect of elevated temperature on compressive and flexural behavior of specimens with various strength grades was examined. Effects of age of concrete, weight loss, surface characteristics and thermal crack pattern were also investigated. Findings Experimental investigation shows that strength grade, duration of exposure and age of concrete are the key parameters affecting the residual strength of concrete. For the beams exposed to 3 and 4 h of heating, the residual flexural strength was found to be so insignificant that the specimens were not able to even sustain their own weight. The loss in compressive and flexural strength of Fck50 concrete specimens heated up to 1 h were found to be 26.41 and 86.03 per cent of the original unheated concrete, respectively. The weight loss was found to be more for higher grade concrete specimens, and it was about 8.38 per cent for Fck50 concrete. Regression analysis was carried out to establish the empirical relation between residual strength and grade of concrete. Scanning electron microscopy and thermogravimetric analysis were carried out to examine the damage level of fire-affected concrete specimens. Originality/value Empirical relationship was developed to determine the residual strength of concrete exposed to elevate temperature, and this will be useful for design applications. This database may be useful for identifying member strength of reinforced beams subjected to various durations of heating so that suitable repair technique can be adopted from the available database. It will be useful to identify the proper grade of concrete with regard to fire endurance, in the case of concrete under compression or flexure.