The Fire Resistance Performance of Recycled Aggregate Concrete Columns with Different Concrete Compressive Strengths

Hao, Dong; Cao, Wanlin; Bian, Jianhui; Zhang, Jianwei

doi:10.3390/ma7127843

Cited by 40 publications

(23 citation statements)

References 17 publications

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“…One of the reasons that could justify the hypothesis of the RACs having the best behavior in the event of a fire is that they have lower thermal conductivity, and therefore, a lower penetration rate of the temperature towards the interior of the cross section. This fact could be observed in experimental tests on full-scale reinforced concrete columns carried out by Dong et al [26]. Table 1 summarizes the main experimental campaigns carried out on RAC at high temperatures, breaking down, by columns, the most relevant variables under study.…”

Section: Introductionmentioning

confidence: 78%

Residual Compressive Strength of Recycled Aggregate Concretes after High Temperature Exposure

et al. 2020

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Sustainability requirements are gaining importance in the construction industry, which needs to take specific measures in the design and construction of concrete structures. The use of recycled aggregates in concrete may be of special interest. Recycling a construction waste will close the life cycle of the original materials (e.g., concrete). Thus, environmental benefits would come from the lower waste generation, and from a lower necessity of raw materials for new structures. The current Spanish code for structural concrete considers the use of recycled aggregates in replacement rates up to 20% by aggregate mass, assimilating their properties with those of concretes without aggregate replacement. Higher substitution percentages would require further testing. In this work, substitution of coarse aggregate for recycled aggregates (with replacement percentages of 25%, 50% and 100%) has been studied, and the concrete’s residual properties after exposure to high temperatures (between 350 °C and 850 °C) have been assessed. Compressive strength and capillary water absorption tests were made after heating, and the experiments showed higher residual strength in concretes with the greatest content of recycled aggregates. However, a statistical analysis made with additional data available in the literature seemed to predict otherwise, and the recycled aggregate replacement would have a negative effect on the residual strength.

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Section: Introductionmentioning

confidence: 78%

Residual Compressive Strength of Recycled Aggregate Concretes after High Temperature Exposure

et al. 2020

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“…To encourage the use of RCA worldwide, it is also critical to assure its behavior under extreme conditions, one of those is structural fire endurance. There is only limited number of studies on the performance of RCA when subjected to elevated temperatures [39][40][41][42][43][44]. These studies except the study by Dong et al [43] were carried out on small scale cylinder specimens, and reported the hardened properties of concrete such as compressive strength, splitting tensile strength, modulus of elasticity.…”

Section: Test Resultsmentioning

confidence: 99%

Seismic Behavior of Reinforced Concrete Members Built with Recycled Aggregate

İlki¹,

Saribas²,

Göksu³

2019

acperpro

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In connection with rapid urbanization and earthquakes, a huge number of structures have been demolished and generated lots of waste concrete for the last 40 years. Studies on the reclamation of the waste concrete is a pioneer subject for construction sectors in the world. Since the recycling of the waste concrete and reusing of recycled concrete aggregate in the production of new concrete is an important issue for saving of natural resources, economic, sustainable development, significant number of studies have been carried out on this subject. In the scope of this study, a literature review is conducted on the effect of recycled concrete aggregate on mechanical and durability characteristics of small-scale members. Furthermore, structural and seismic performances of full-scale reinforced concrete structural members produced with recycled concrete aggregate are discussed. The test results indicated that the structural members containing recycled aggregate exhibited similar structural performance with their counterparts containing natural aggregates. It was also observed that recycled concrete aggregate did not seem to have an adverse effect on seismic characteristics of the structural members such as ductility.

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“…Although more complex FE models [16,[24][25][26] have been established to study the mechanical behavior of RC structures at elevated temperatures, one of the main objectives of this study is to develop a simplified numerical approach able to predict the global response of RC beams exposed to fire and simultaneously releasing the computational burden. A one-dimensional spectral element model will be implemented in this study to analyze the mechanical behaviors of RC beams; it will be briefly presented since it has been detailed in [27,28], to simulate RC beams that are externally bonded with fiber-reinforced polymer strips and interfacial debonding damage.…”

Section: Spectral Element Model For Rc Beamsmentioning

confidence: 99%

Modeling of Reinforced Concrete Beams Exposed to Fire by Using a Spectral Approach

Sun

Xie

Perera

et al. 2018

Advances in Materials Science and Engineering

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is paper presents a numerical procedure for predicting the mechanical behavior of reinforced concrete (RC) beams exposed to fire. ermal behavior is captured using a two-dimensional finite element (FE) model in an environment of elevated temperatures, while a one-dimensional spectral numerical model is formulated to simulate the mechanical response of the beam under increasing loads. Both models are integrated. Previous thermal results obtained from the FE model are provided for the proposed numerical model to calculate the responses of the RC beam for different levels of fire exposure. Few elements are deployed in this study due to the simplicity and efficiency of the proposed numerical model. Consequently, the computational burden of the numerical simulation for predicting the structural performances of RC beams exposed to fire is released comparing with conventional FE model. e numerical results are consistent with the test data, which demonstrate the model's capability of efficiently simulating the thermomechanical behaviors of RC beams due to its simplicity and accuracy.

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The Fire Resistance Performance of Recycled Aggregate Concrete Columns with Different Concrete Compressive Strengths

Cited by 40 publications

References 17 publications

Residual Compressive Strength of Recycled Aggregate Concretes after High Temperature Exposure

Residual Compressive Strength of Recycled Aggregate Concretes after High Temperature Exposure

Seismic Behavior of Reinforced Concrete Members Built with Recycled Aggregate

Modeling of Reinforced Concrete Beams Exposed to Fire by Using a Spectral Approach

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