High temperature resistance of desert sand concrete: Strength change and intrinsic mechanism

Shen, Yanjun; Peng, Cong; Hao, Jianshuai; Bai, Zhipeng; Li, Yugen; Yang, Bohan

doi:10.1016/j.conbuildmat.2022.126948

Cited by 20 publications

(5 citation statements)

References 43 publications

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“…The air‐cooled DSC specimen slowly experienced the cooling process. The severe thermal shock for DSC specimen is produced during the rapid water cooling process to generate some residual stress inside the water‐cooled DSC specimen and then increase cracks 27,28 . Therefore, the damage of DSC specimen with water cooling is more serious than that with air cooling.…”

Section: Resultsmentioning

confidence: 99%

Effect of high temperature on residual splitting strength of desert sand concrete

Yang

Zhang

2023

Structural Concrete

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The ordinary medium sand can no longer meet the increasing demands of engineering projects. Construction costs can be reduced and the natural environment can be protected by rational use of the local desert sand. To evaluate the spalling and fire resistance of the concrete, the desert sand concrete (DSC) is heated to 100-800 C and then cooled for splitting tensile strength test. The test results indicate that with the increment of desert sand replacement rate (DSRR), the compressive strength of DSC increases first and then decreases.The maximum value is reached when DSRR is up to 40%. The presence of fly ash slows down the loss of splitting strength of concrete with the temperature increasing. The regression model is established to predict the functional relationship between the concrete splitting strength and temperatures under heating and air cooling conditions. The result shows that the predictions calculated by the formula are consistent with the experimental results. The formula can be employed as a constitutive relation of the computer model to evaluate the spalling and fire resistance of the DSC structure.

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Section: Resultsmentioning

confidence: 99%

Effect of high temperature on residual splitting strength of desert sand concrete

Yang

Zhang

2023

Structural Concrete

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“…At 200 °C, compared with FA-0, the compressive strength of FA-20, FA-40, FA-60, FA-80, and FA-100 mixtures increased by 4.0, 10.1, 18.2, 22.5, and 16.7%, respectively. An increase in temperature from room temperature to 200 °C considerably promoted sufficient hydration inside the concrete, filling internal pores with hydration products and making the internal structure more dense, resulting in an increase in the compressive strength of the specimen within this temperature range [ 47 ]. At 400 °C, some hydration products such as Ca(OH) 2 and C-S-H in the mortar begin to decompose, and the compressive strength decreased slightly [ 48 ].…”

Section: Resultsmentioning

confidence: 99%

Effect of Replacing Fine Aggregate with Fly Ash on the Performance of Mortar

Zhang

Yang

2023

Materials

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Natural river sand resources are facing depletion, and large-scale mining pollutes the environment and harms humans. To utilize fly ash fully, this study used low-grade fly ash as a substitute for natural river sand in mortar. This has great potential to alleviate the shortage of natural river sand resources, reduce pollution, and improve the utilization of solid waste resources. Six types of green mortars were prepared by replacing different amounts of river sand (0, 20, 40, 60, 80, and 100%) with fly ash and other volumes. Their compressive strength, flexural strength, ultrasonic wave velocity, drying shrinkage, and high-temperature resistance were also investigated. Research has shown that fly ash can be used as a fine aggregate in the preparation of building mortar, thereby ensuring that green-building mortar has sufficient mechanical properties and better durability. The replacement rate for optimal strength and high-temperature performance was determined to be 80%.

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“…Meanwhile, compared with the initial compressive strength at 20 °C, the compressive strengths of MSC from 38% to 48% sand ratio decreased by 49.9%, 45.8%, 41.6%, 37.9%, and 33.2%, respectively. The results demonstrated that the high-temperature resistance of MSC increased with the increase in sand ratio, due to an increase in the content of sand with good thermal insulation properties and a decrease in the content of coarse aggregates with poor thermal insulation properties [19,31].…”

Section: High-temperature Resistancementioning

confidence: 95%

“…It was reported that building fires performed a serious impact on the mechanical properties of concrete, resulting in the collapse of buildings [19,20]. High-rise building fire requires building materials with better high-temperature resistance, so as to reduce casualties and economic losses.…”

Section: Introductionmentioning

confidence: 99%

The flowability and high-temperature resistance of manufactured sand concrete: An exploration for high-rise buildings

Ren,

Hua,

Wang

et al. 2023

Mater. Res. Express

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The depletion of natural concrete aggregates, e.g., river sands, is a gradual process, and hence, manufactured sand concrete (MSC) is widely used in various construction projects. The flowability and high-temperature resistance of MSC directly determine the transport of fresh concrete and the fire resistance of high-rise buildings. In this study, MSC with different superplasticizer contents and sand ratios was prepared and its flowability and high-temperature resistance were studied. Scanning electron microscopy (SEM) and mercury intrusion porosimetry (MIP) were used to characterize the microstructure and porosity of MSC. The flowability of MSC with higher than 0.75% superplasticizer content or lower than 43% sand ratio is suitable for super high-rise buildings according to GB/T 50081-2019. The mechanical properties of other MSC meet the C30 requirements except for the MSC with a sand ratio of 48%. And the relatively high superplasticizer content or low sand ratio can make the denser structure and lower porosity of MSC. In addition, the MSC with relatively high superplasticizer content and low sand ratio exhibits better resistance to high temperatures due to a denser structure. This study provides theoretical guidance for using MSC in high-rise buildings and studying fire performance.

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High temperature resistance of desert sand concrete: Strength change and intrinsic mechanism

Cited by 20 publications

References 43 publications

Effect of high temperature on residual splitting strength of desert sand concrete

Effect of high temperature on residual splitting strength of desert sand concrete

Effect of Replacing Fine Aggregate with Fly Ash on the Performance of Mortar

The flowability and high-temperature resistance of manufactured sand concrete: An exploration for high-rise buildings

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