Residual fracture mechanical properties of quartz and expanded clay aggregate concrete subjected to elevated temperature

Hlavicka, Viktor; Hlavicka-Laczák, Lili Eszter; Lublóy, Éva

doi:10.1016/j.conbuildmat.2022.126845

Cited by 16 publications

(4 citation statements)

References 30 publications

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“…The relationship between the compressive strength and the coarse aggregate density shows in Fig. 4, agrees with the results obtained in the other studies [33,34]. The compressive strength of M4-EG is 65% less than the compressive strength of M1-QZ as expanded glass as it is a lightweight aggregate, and its density is lower than the density of quartz aggregate.…”

Section: Exposing Concrete Specimens To Elevated Temperaturessupporting

confidence: 90%

Influence of Elevated Temperatures on the Compressive Strength of Concrete Made with Different Types of Aggregate

Seyam,

Nemes

2024

Period. Polytech. Civil Eng.

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Concrete, the backbone of modern infrastructure, exhibits varying mechanical behaviour that depends on its components, with aggregates playing a crucial role in its strength and durability. This study aimed to investigate the influence of elevated temperatures on the compressive strength of concrete made with different types of aggregate. A comprehensive evaluation of concrete mixes was conducted using quartz, crushed clay bricks, crushed andesite, expanded clay and expanded glass coarse aggregates. For each coarse aggregate type, concrete mixtures were made with the same amount of Portland cement, water-cement ratio, natural sand, and superplasticizer. The effective water-cement ratio and cement content were kept constant in each concrete mixture. The grading and maximum particle size were the same in all concrete mixtures. The results revealed that the type of aggregate has a significant impact on the compressive strength and thermal resistance of concrete, with andesite-containing concrete exhibiting the highest residual strength after heating up to 800 °C and clay brick-concrete displaying the highest strength under elevated temperatures up to 1000 °C. The study also found that the age of concrete affects its strength at elevated temperatures, as concrete in the early stages of hydration is more susceptible to thermal cracking than concrete that has had more time to cure. Generally, the compressive strength of normal-weight aggregates depends on the strength of the parent rock. But in the case of fire (elevated temperature), the cement paste matrix loses its strength, and the aggregates effects become more significant.

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Section: Exposing Concrete Specimens To Elevated Temperaturessupporting

confidence: 90%

Influence of Elevated Temperatures on the Compressive Strength of Concrete Made with Different Types of Aggregate

Seyam,

Nemes

2024

Period. Polytech. Civil Eng.

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“…Savva et al [26] also showed in their study how high temperatures affect the mechanical properties of pozzolanic concrete, in which the findings of the study concluded that the concrete's residual properties crucially depend on the type of aggregates and binder. By considering different heating loads, the mechanical properties of residual fracture, such as stress intensity factor and fracture energy, were analyzed by Hlavička et al [27]. Song et al [28] determined that longitudinal reinforcement and proper stirrup reinforcement designs may enhance the fire resistance performance of simply supported reinforced concrete beams.…”

Section: Introductionmentioning

confidence: 99%

Reliability Assessment of Reinforced Concrete Beams under Elevated Temperatures: A Probabilistic Approach Using Finite Element and Physical Models

et al. 2023

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A novel computational model is proposed in this paper considering reliability analysis in the modelling of reinforced concrete beams at elevated temperatures, by assuming that concrete and steel materials have random mechanical properties in which those properties are treated as random variables following a normal distribution. Accordingly, the reliability index is successfully used as a constraint to restrain the modelling process. A concrete damage plasticity constitutive model is utilized in this paper for the numerical models, and it was validated according to those data which were gained from laboratory tests. Detailed comparisons between the models according to different temperatures in the case of deterministic designs are proposed to show the effect of increasing the temperature on the models. Other comparisons are proposed in the case of probabilistic designs to distinguish the difference between deterministic and reliability-based designs. The procedure of introducing the reliability analysis of the nonlinear problems is proposed by a nonlinear code considering different reliability index values for each temperature case. The results of the proposed work have efficiently shown how considering uncertainties and their related parameters plays a critical role in the modelling of reinforced concrete beams at elevated temperatures, especially in the case of high temperatures.

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“…Given the mode of its implementation, the constituents used in the manufacture of SCCs, according to their use, are grouped into three categories: base materials (cement, aggregates, and mixing water), mineral additives, and chemical additives [3]. Several studies have been carried out to analyze the behavior of concrete at high temperatures [4][5][6][7].…”

mentioning

confidence: 99%

Experimental Investigation of the High Temperatures Effects on Self-Compacting Concrete Properties

et al. 2022

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Self-compacting concrete (SCC), which appeared in the 1980s in Japan, is a concrete that differs from others by its high fluidity. The constituents of SCC can be quite different from those of ordinary concretes. They can differ both in their proportions and in their choice. Given the method of installation of SCCs, particular attention is paid to the study of their physical and mechanical characteristics. In this context, experimental tests were conducted to assess the effect of high temperatures on the behavior of SCC. For this purpose, a SCC and ordinary concrete (OC) were tested at temperatures of 20, 150, 300, 450, and 600 ∘C. Prismatic specimens of dimensions 100 × 100 × 400 mm3, cylindrical specimens of dimensions 160 × 320 mm, and parallelepiped specimens of dimensions 270 × 270 × 40 mm3 were prepared for physical (thermal conductivity) and mechanical (compressive strength, elastic modulus, flexural strength, and ultrasonic pulse velocity) tests. The results showed an increase in the compressive strength for SCC between 150 and 300 ∘C following an additional hydration of the cementitious matrix. The residual flexural strength of the concretes decreases progressively with the increase in temperature. This reduction is about 90% from 450 ∘C to 600 ∘C. The results also showed that the thermal conductivity of concrete decreases as the temperature increases and can reach a value of 1.2 W/mK for the heating temperature of 600 ∘C.

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Residual fracture mechanical properties of quartz and expanded clay aggregate concrete subjected to elevated temperature

Cited by 16 publications

References 30 publications

Influence of Elevated Temperatures on the Compressive Strength of Concrete Made with Different Types of Aggregate

Influence of Elevated Temperatures on the Compressive Strength of Concrete Made with Different Types of Aggregate

Reliability Assessment of Reinforced Concrete Beams under Elevated Temperatures: A Probabilistic Approach Using Finite Element and Physical Models

Experimental Investigation of the High Temperatures Effects on Self-Compacting Concrete Properties

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