Experimental study on mechanical properties of precast cracked concrete under different cooling methods

Zhao, Yu; Ding, Ding; Bi, Jing; Wang, Chaolin; Liu, Pengfei

doi:10.1016/j.conbuildmat.2021.124141

Cited by 27 publications

(13 citation statements)

References 45 publications

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“…The transverse relaxation time T2 distribution of the specimens was obtained, as shown in Figure 11 . The areas surrounded by the T2 spectrum curve and the x -axis characterize the internal pore area of the specimens, the transverse relaxation time was proportional to the pore diameter, and the change in the T2 spectrum can reflect the change in the internal pore structure of the specimen [ 40 ]. It can be seen that the T2 distribution of the binder SAC, slag ( Figure 11 a,c), and OPC ( Figure 11 b) were significantly different.…”

Section: Resultsmentioning

confidence: 99%

Properties of Light Cementitious Composite Materials with Waste Wood Chips

Guo

Wang

et al. 2022

Materials

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The CO2 emissions from the cement industry and the production of waste wood chips are increasing with the rapid growth of the construction industry. In order to develop a green environmental protection building material with low thermal conductivity and up to standard mechanical properties, in this study, pine waste wood chips were mixed into cement-based materials as fine aggregate, and three different kinds of cementitious binders were used, including sulfur aluminate cement (SAC), ordinary Portland cement (OPC), and granulated blast furnace slag (GBFS), to prepare a recycled light cementitious composite material. The mechanical, thermal conductivity, shrinkage, water absorption, and pore structure of a wood chip light cementitious composite material were studied by changing the Ch/B (the mass ratio of wood chip to binder). The results showed that the strength, dry density, and thermal conductivity of the specimens decreased significantly with the increase in the Ch/B, while the shrinkage, water absorption, and pore size increased with the increase in the Ch/B. By comparing three different kinds of cementitious binders, the dry density of the material prepared with OPC was 942 kg/m3, the compressive strength of the material prepared with SAC was 13.5 MPa, and the thermal conductivity of the material prepared with slag was the lowest at 0.15 W/m/K. From the perspective of low-cost and low-carbon emissions, it was determined that the best way to prepare a light cementitious composite with waste wood chips is to use granulated blast furnace slag (GBFS) as the cementitious binder.

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Section: Resultsmentioning

confidence: 99%

Properties of Light Cementitious Composite Materials with Waste Wood Chips

Guo

Wang

et al. 2022

Materials

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“…Zhao et al studied the variation of the microstructure of pre-cracked concrete under different cold methods, the results showed that the surface of specimens cooled in the air after the high temperature at 300 °C became rough. After high-temperature treatment, the crack between the interface of aggregate and cement paste is damaged from the scanning electron microscope image, and the cement compound becomes loose [ 16 ]. At 500 °C, after water cooling, the surface of the specimens was severely damaged, and the excessive temperature difference led to cracks in the specimens.…”

Section: Introductionmentioning

confidence: 99%

Heating Rate Effect on Gas Permeability and Pore Structure of Mortar under High Temperature

et al. 2022

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This experimental study investigated the effect of heating rate on mortar gas permeability and microstructure. The mortar was heated to three target temperatures (400 °C, 500 °C, and 600 °C) at three heating rates (5 °C/min,10 °C/min, and 15 °C/min). The variations of gas permeability and porosity were measured simultaneously at different confining pressures, and the changes in mortar microstructure were analyzed by NMR and SEM techniques. The results show that the porosity and gas permeability increase with an increase in temperature and heating rate. The gas permeability and porosity continue to decrease as confinement is increased due to a reduction in the pore volume. The microstructure observed by SEM indicates that the high heating rate induces some microcracks at 500 °C and 600 °C. The fractal dimension based on NMR can quantitatively characterize the complexity of the mortar pore structure and shows a quadratic decreasing relationship with gas permeability and porosity.

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“…Researchers have developed many methods to assess the quality level of pavement performance [2]. For example, the system analysis evaluation method [3], the comprehensive evaluation method [4], the extension cloud evaluation method [5], the extension evaluation method [6], the fuzzy compound matter element method [7], the gray fuzzy clustering method [8], the regression analysis method [9], the multivariate statistical techniques [10], the wavelet technique [11], and evaluation method using analytical connection coe cients [12]. ese methods have furthered the development of assessment systems but still exhibited some shortcomings [13].…”

Section: Introductionmentioning

confidence: 99%

The Quality Assessment of Pavement Performance Using the Entropy Weight-Variable Fuzzy Sets Model

Wang

et al. 2022

Mathematical Problems in Engineering

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As the assessment of pavement performance has considerable repercussions for the construction quality of roads, the study of the assessment procedure used is extremely critical. Riding quality index (RQI), pavement condition index (PCI), pavement structure strength index (PSSI), skid resistance index (SRI), and antirutting index (ARI) are selected as the assessment indexes of pavement performance. Then, the entropy weight-variable fuzzy sets model is introduced. Second, a relative membership degree matrix for the variable fuzzy sets is established, and the entropy weight method is used to determine the weight coefficients considering the uncertainty in the assessment indices. Finally, the quality level of pavement performance is determined by using the mean ranking feature value. The conclusions demonstrate a very accurate rate for the quality assessment of the pavement performance based on the variable fuzzy sets model compared to that based on the current specification, and the proposed method is feasible for the quality assessment of pavement performance, thus providing a novel means of assessing the quality level of pavement performance in the future.

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Experimental study on mechanical properties of precast cracked concrete under different cooling methods

Cited by 27 publications

References 45 publications

Properties of Light Cementitious Composite Materials with Waste Wood Chips

Properties of Light Cementitious Composite Materials with Waste Wood Chips

Heating Rate Effect on Gas Permeability and Pore Structure of Mortar under High Temperature

The Quality Assessment of Pavement Performance Using the Entropy Weight-Variable Fuzzy Sets Model

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