New Approaches in Civil Engineering

New Approaches in Civil Engineering

Determination of Mechanical Characteristics of Types of Fiber concrete at High Temperatures

Document Type : Research Paper

Authors
mostafa khiyabani 1
mohammad reza javaheri tafti 2
1 Ph.D. Can., Department of Civil Engineering, Taft Branch, Islamic Azad University, Taft, Iran
2 Assistant Professor, Department of Civil Engineering, Taft Branch, Islamic Azad University, Taft, Iran
10.30469/jnace.2024.425869.1100
Abstract
Concrete is the most used construction material in the world. Today, there are various concretes with different applications in the industry. One of the types of concrete is fiber concrete. In this study, several concrete samples were made with steel, glass and polypropylene fibers and the effect of the volume and weight percentages of each of the fibers in improving the compressive strength of the samples at temperatures Different has been checked. In order to check the results and the possibility of comparing it with the behavior of normal concrete, a type of concrete without fibers was also made using common materials and similar tests were performed on it. Based on the investigations, the results showed that the concrete samples with steel fibers tolerated higher temperature levels and had higher resistance compared to other samples. In the samples, by adding 0.25% and 0.5% by volume of steel fibers to concrete, respectively, the compressive strength of the sample at high temperatures was improved. The strength of concrete samples with 3400 Kg/m was slightly decreased by increasing the percentage of fibers from 0.5% to 0.75%. The compressive strength of concrete containing steel fibers is 20% higher than that of concrete containing propylene fibers.
Keywords
Fiber concrete
Glass fibers
Propylene fibers
Steel fibers
Compressive strength

Subjects

1- Qolheki, M. and Pachideh, Qh. and Nakhdi, E. and Alavi, M., 2016, Laboratory study of tensile strength of fiber concrete with metal fibers at different temperatures, In: The 4th International Congress of Civil Engineering, Architecture and Urban Planning. Tehran: Shahid Beheshti University.
2-Kikha, A., 2006, Effect of high temperature on compressive and tensile strength of concretes containing glass fibers, Concrete research, 10, 1, 63-73.
3-Mander, J. B., et al., 1986, THEORETICAL STRESS-STRAIN MODEL FOR CONFINED CONCRETE, Journal of Structural Engineering, 114.
4- Leppanen, J., 2006, Concrete subjected to projectile and fragment impacts: Modelling of crack softening and strain rate dependency in tension, International Journal of Impact Engineering, 32, 11, 1828–1841.
5- PARK, R. and PAULAY, T., 1975, Reinforced Concrete Structures, Canada: Wiley.
6- Wight, J. K. and MacGregor J. G., 2009, Reinforced concrete Mechanics and Design, London: Pearson Education.
7- Husem, M., 2006, The effects of high temperature on compressive and flexural strengths of ordinary and high-performance concrete, Fire Safety Journal, 41, 2, 155-163.
8- Sakr, K. and El-Hakim, E., 2005, Effect of high temperature or fire on heavy weight concrete properties, Cement and concrete research, 35, 3, 590-596.
9- Qolheki, M. and Pachideh, Qh. and Rezaeifar, O., 2016, Laboratory study of mechanical characteristics of concrete containing steel fibers and polypropylene at high temperatures, Scientific-research journal of structural and construction engineering, 4, 3, 167-179.
10- Fletcher, I. A. and Welch, S. and Torero, J. L. and Carvel, R. O. and Usmani, A., 2007, Behaviour of concrete structures in fire, Thermal science, 11, 2, 37-52.
11- Yüzer, N. and Aköz, F. and Öztürk, L. D., 2004, Compressive strength–color change relation in mortars at high temperature, Cement and Concrete Research. 34, 10, 1803-1807.
12- Haddad, R. H. and Ra'ed, M. A., 2004, Effect of thermal cycling on bond between reinforcement and fiber reinforced concrete, Cement and Concrete Composites, 26, 6, 743-752.
13- Chan, Y. N. and Luo, X. and Sun, W., 2000, Compressive strength and pore structure of high-performance concrete after exposure to high temperature up to 800 C, Cement and Concrete Research, 30, 2, 247-251.
14- Al Qadi, A. N. and Al-Zaidyeen, S. M., 2014, Effect of fibre content and specimen shape on residual strength of polypropylene fibre self-compacting concrete exposed to elevated temperatures, Journal of King Saud University-Engineering Sciences, 26, 1, 33-39.
15- Demirel, B. and Keleştemur, O., 2010, Effect of elevated temperature on the mechanical properties of concrete produced with finely ground pumice and silica fume, Fire Safety Journal. 45, 6, 385-391.
16- Behnood, A. and Ghandehari, M., 2009, Comparison of compressive and splitting tensile strength of high-strength concrete with and without polypropylene fibers heated to high temperatures, Fire Safety Journal, 44, 8, 1015-1022.
17- Düğenci, O. and Haktanir, T. and Altun, F., 2015, Experimental research for the effect of high temperature on the mechanical properties of steel fiber-reinforced concrete, Construction and Building Materials, 75, 82-88.
18- American Concrete Institute, 2014, Building Code Requirements for Structural Concrete and Commentary, Detroit: MI.
New Approaches in Civil Engineering
Volume 7, Issue 4
Winter 2024
Pages 53-68