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This research includes an experimental investigation on the effect of elevated temperature on compressive and tensile strength of concrete with admixture. In this experiment, compressive and tensile strength are measured for normal concrete and concrete with plasticizer admixture (POZZOLITH CRP4) in the temperature range (25-600) °C. Some other pro...
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Citations
... Therefore, in order to use the same series of results to calculate DIFs at both ambient and high temperatures, the quasi-static compressive cube strengths at 20 and 500°C (Table 3) were used to estimate cylinder values. The cylinder strength of a concrete specimen is approximately 0.8 that of an equivalent cube at 20°C, but 0.5 that at 500°C (Razib and Rahman, 2017). Figure 13 shows the DIF calculated from dynamic disc strengths and quasi-static cylinder specimens at 20 and 500°C for both fresh and carbonated CEM I 20 MPa concrete. ...
This paper presents the results of an experimental study to investigate changes in mechanical properties of two types of concrete under normal and extreme loading conditions pre- and post-carbonation. Specimens of CEM I and CEM II concrete (concrete prepared with 20% replacement cement with PFA) were cured for 28 days before accelerated carbonation under 4% CO2 for 28 days at 20 °C and 57% relative humidity. Static compressive mechanical tests at ambient temperature were carried out for both concrete types. For CEM I concrete, static compressive mechanical tests were performed at elevated temperatures of 300, 500 and 650 °C, and high strain-rate tests at ambient and elevated temperature of 500 °C. The results show that the mechanical performance of CEM I concrete was improved after carbonation, i.e. increase of static compressive strength at ambient and elevated temperatures, and higher dynamic strength than fresh concrete at the same strain-rate at both ambient and elevated temperatures. However, CEM II concrete suffers reductions in compressive strength after carbonation.
... The furnace was switched off and the cubes were allowed to cool down naturally inside the furnace. The used of 600°C was referred to the previous researcher [11] in the study of elevating the effect of temperature on compressive and tensile strength of concrete with admixture. Meanwhile the used of temperature of 800°C was to test the cylinders whether both unconfined and confined cylinders could withstand the high temperature or not. ...
Currently, in Malaysia, there has been an alarming number of fire breakouts that not only concern the lives of the residents but also the integrity of the exposed structures themselves. Exposure to high temperature may result in significant damage to reinforced concrete structures such as losses in strength, thus affecting its mechanical and physical properties. The chances of re-using the structure after the event of a fire by means of applying certain retrofitting measures are mainly dependent on the residual load-bearing capacity and an acceptable residual deflection. The structural design of buildings should be carried out so that a structure is able to maintain its stability and strength throughout its service life, including design consideration on fire resistance. This research was carried out to study the effectiveness of the carbon fiber reinforced polymer (CFRP) sheet to strengthened concrete cylinders under high temperatures (600°C and 800°C). The study will focus on the effect of high temperature on compressive strength as well as the effect of high temperature on the CFRP concrete cylinder. Eighteen (18) concrete cylinder samples of 300 mm height and 150 mm diameter were fabricated, which consist of six (6) control samples (without CFRP), six (6) CFRP concrete cylinder and the remaining three (3) CFRP concrete cylinders were insulated with fire protection mortar. The average strength loss of the control sample (without CFRP), when exposed to 600°C, is about 28% compared to control samples. The average compressive strength of the CFRP concrete cylinder exposed to 600°C is increased by about 9% compared to the control sample. Fire protection mortar can prevent the concrete cylinder from spalling, major cracks and combustion of CFRP at high temperature. The knowledge in this research field can be used as the basis for structural rehabilitation work.
