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Residual compressive stress–strain relationship of lightweight aggregate concrete after exposure to elevated temperatures
https://orcid.org/0000-0001-9609-4512
https://orcid.org/0000-0001-7772-4531
Highlights Lightweight aggregate concrete explored at elevated temperature. More strength retention with increase in LA content at higher temperatures. The highest reduction in the elastic modulus happens at 750 °C. Strain at peak stress more than three times at 750 °C compared to ambient temperature. Stress–strain model for LWAC with silica fume and Leca in elevated temperatures.
Abstract This experimental study investigated the compressive behavior of lightweight concrete after exposure to elevated temperatures. In total, 240 samples from 30 different mixtures were prepared and tested to evaluate the compressive strength, elastic modulus, strain at peak stress, and stress–strain relationships of lightweight aggregate concrete (LWAC) after being exposed to elevated temperature of 250, 500, and 750 °C. Test variables were composed of cement content varied between 300 and 700 kg/m3, volumetric percentage of lightweight expanded clay aggregates (Leca) substituting natural sand and gravel at 0, 25, 50, 75, and 100% (by weight), silica fume replacing cement at 5, 7.5, 10, 12.5, and 15% (by weight) and different water to cement ratios of 0.250, 0.313, 0.375, 0.438, and 0.500. The compressive strength, elastic modulus, and strain in the maximum stress were compared with predictions from the American and European standards and the proposed analytical models. The results showed that the compressive strength and elastic modulus of LWAC declined with increasing the temperature. The samples S6, S4 and S23 performed better compared to other specimens at elevated temperature as they retained about 96%, 75% and 42% of compressive strength, respectively after exposure to 250, 500 and 750 °C. A higher residual compressive strength was observed in the sample including 75% Leca at 750 °C. The experimental stress–strain relationship was verified according to the available analytical models and an analytical model was proposed to estimate the compressive behavior of LWAC at elevated temperature.
Residual compressive stress–strain relationship of lightweight aggregate concrete after exposure to elevated temperatures
https://orcid.org/0000-0001-9609-4512
https://orcid.org/0000-0001-7772-4531
Highlights Lightweight aggregate concrete explored at elevated temperature. More strength retention with increase in LA content at higher temperatures. The highest reduction in the elastic modulus happens at 750 °C. Strain at peak stress more than three times at 750 °C compared to ambient temperature. Stress–strain model for LWAC with silica fume and Leca in elevated temperatures.
Abstract This experimental study investigated the compressive behavior of lightweight concrete after exposure to elevated temperatures. In total, 240 samples from 30 different mixtures were prepared and tested to evaluate the compressive strength, elastic modulus, strain at peak stress, and stress–strain relationships of lightweight aggregate concrete (LWAC) after being exposed to elevated temperature of 250, 500, and 750 °C. Test variables were composed of cement content varied between 300 and 700 kg/m3, volumetric percentage of lightweight expanded clay aggregates (Leca) substituting natural sand and gravel at 0, 25, 50, 75, and 100% (by weight), silica fume replacing cement at 5, 7.5, 10, 12.5, and 15% (by weight) and different water to cement ratios of 0.250, 0.313, 0.375, 0.438, and 0.500. The compressive strength, elastic modulus, and strain in the maximum stress were compared with predictions from the American and European standards and the proposed analytical models. The results showed that the compressive strength and elastic modulus of LWAC declined with increasing the temperature. The samples S6, S4 and S23 performed better compared to other specimens at elevated temperature as they retained about 96%, 75% and 42% of compressive strength, respectively after exposure to 250, 500 and 750 °C. A higher residual compressive strength was observed in the sample including 75% Leca at 750 °C. The experimental stress–strain relationship was verified according to the available analytical models and an analytical model was proposed to estimate the compressive behavior of LWAC at elevated temperature.
Residual compressive stress–strain relationship of lightweight aggregate concrete after exposure to elevated temperatures
https://orcid.org/0000-0001-9609-4512
https://orcid.org/0000-0001-7772-4531
Highlights Lightweight aggregate concrete explored at elevated temperature. More strength retention with increase in LA content at higher temperatures. The highest reduction in the elastic modulus happens at 750 °C. Strain at peak stress more than three times at 750 °C compared to ambient temperature. Stress–strain model for LWAC with silica fume and Leca in elevated temperatures.
Abstract This experimental study investigated the compressive behavior of lightweight concrete after exposure to elevated temperatures. In total, 240 samples from 30 different mixtures were prepared and tested to evaluate the compressive strength, elastic modulus, strain at peak stress, and stress–strain relationships of lightweight aggregate concrete (LWAC) after being exposed to elevated temperature of 250, 500, and 750 °C. Test variables were composed of cement content varied between 300 and 700 kg/m3, volumetric percentage of lightweight expanded clay aggregates (Leca) substituting natural sand and gravel at 0, 25, 50, 75, and 100% (by weight), silica fume replacing cement at 5, 7.5, 10, 12.5, and 15% (by weight) and different water to cement ratios of 0.250, 0.313, 0.375, 0.438, and 0.500. The compressive strength, elastic modulus, and strain in the maximum stress were compared with predictions from the American and European standards and the proposed analytical models. The results showed that the compressive strength and elastic modulus of LWAC declined with increasing the temperature. The samples S6, S4 and S23 performed better compared to other specimens at elevated temperature as they retained about 96%, 75% and 42% of compressive strength, respectively after exposure to 250, 500 and 750 °C. A higher residual compressive strength was observed in the sample including 75% Leca at 750 °C. The experimental stress–strain relationship was verified according to the available analytical models and an analytical model was proposed to estimate the compressive behavior of LWAC at elevated temperature.
Residual compressive stress–strain relationship of lightweight aggregate concrete after exposure to elevated temperatures
Dabbaghi, Farshad (author) / Dehestani, Mehdi (author) / Yousefpour, Hossein (author) / Rasekh, Haleh (author) / Navaratnam, Satheeskumar (author)
2021-06-05
Article (Journal)
Electronic Resource
English
Residual Compressive Stress-Strain Relationship for Concrete Subjected to Elevated Temperatures
| Emerald Group Publishing | 2012