Dynamic Characteristics and Chloride Resistance of Basalt and Polypropylene Fibers Reinforced Recycled Aggregate Concrete

Lu, Dong; Cao, Hui; Shen, Qiangru; Gong, Yangyang; Yan, Xiaohui

doi:10.1155/2020/6029047

Cited by 9 publications

(4 citation statements)

References 33 publications

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“…Interestingly, the shape of the RCA can be optimized with the help of the peeling-off effect, reducing the aspect ratio of the RCA and making the RCA's shape more uniform. The mechanical grinding method includes three types [24]. (1) Traditional mechanical grinding: this approach is achieved by the rolling vibration effect of the eccentric gears rotating at high speed in the grinder.…”

Section: Mechanical Grindingmentioning

confidence: 99%

Performance Improvement of Recycled Concrete Aggregates and Their Potential Applications in Infrastructure: A Review

Han

Zhao²,

et al. 2023

Buildings

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In the construction industry, natural aggregates (NA) can be replaced by recycled concrete aggregates (RCA), which can address the issue of construction-waste disposal and resolve the dilemma between demand and supply. This paper aims to systematically review the modification of RCA techniques and their application in producing recycled aggregate concrete (RAC). First, the pretreatment approaches for enhancing the properties of RCA are introduced. Next, the improved efficiency of these approaches and their influences on the workability, mechanical strengths, and permeability of RAC are analyzed and discussed. Subsequently, the effectiveness of different techniques and their cost/environmental impact are compared. Finally, some case studies of the application of RCA in infrastructure are presented, and the remaining challenges and perspectives are discussed. The results of this review work can extend the knowledge of RCA and RAC, as well as serving as a source of inspiration for further studies.

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Section: Mechanical Grindingmentioning

confidence: 99%

Performance Improvement of Recycled Concrete Aggregates and Their Potential Applications in Infrastructure: A Review

Han

Zhao²,

et al. 2023

Buildings

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“…Du et al [37] investigated the sulphate resistance of recycled aggregate concrete under sulphate wetting-drying cycles. Lu et al [38] studied the dynamic properties and chloride resistance of basalt and polypropylene-fiber-reinforced recycled aggregate concrete based on the experiment.…”

Section: Introductionmentioning

confidence: 99%

Multidimensional Transport Experiment and Simulation of Chloride Ions in Concrete Subject to Simulated Dry and Wet Cycles in a Marine Environment

Xu,

He,

et al. 2023

Materials

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Chloride ion erosion is an important factor affecting the durability of marine engineering concrete. In particular, concrete structures in wave splash and tidal zones are subjected to dry and wet cycles and multidimensional diffusion of chloride ions. To investigate the intricate diffusion of chloride ions within concrete under these dynamic conditions, we devised a comprehensive experiment. This experiment encompasses multiple dimensions, involving dry and wet cycles, as well as static immersion. The experiment intends to reveal how chloride ions are distributed in the concrete and clarify the changes that occur in its microstructure. Based on Fick’s second law, the multidimensional diffusion model of chloride ions in concrete under the dry and wet cycles and static immersion was established by comprehensively considering the effects of chloride ion exposure time, environment temperature, relative humidity, and the action of dry and wet cycles. The results show that, under the same conditions, the chloride content in concrete decreases with the increase in penetration depth but increases with the increase in the chloride diffusion dimension and exposure time. Dry and wet cycles and multidimensional diffusion of chloride ions increase the development of cracks and pores in the concrete structure and generate large quantities of C3A·CaCl2·10H2O, which will exacerbate the chloride ion transport rate and penetration depth of concrete. Under the same exposure time and penetration depth, the chloride ion content in concrete under two-dimensional (2D) and three-dimensional (3D) diffusion under dry and wet cycles was 1.09~4.08 times higher than that under one-dimensional (1D) diffusion. The correlation coefficients between the simulation results of the multidimensional transport model of chloride ions in concrete under multi-factor coupling and the experimental results were all greater than 0.95, and the model can be utilized to predict the distribution of chloride ion concentration in concrete.

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“…Compared with using natural aggregates, concrete using recycled aggregates may lead to defects including low workability, low strength and other durability problems [ 53 , 54 , 55 ]. Because of the low performance of recycled concrete aggregates, it is commonly believed that the replacement ratio of recycled concrete aggregates cannot be higher than 30% for the total mass of aggregates [ 56 , 57 , 58 , 59 ]. An important factor is the impurities that adhere to the surface of recycled concrete aggregates [ 60 , 61 , 62 ].…”

Section: Introductionmentioning

confidence: 99%

Mass GGBFS Concrete Mixed with Recycled Aggregates as Alkali-Active Substances: Workability, Temperature History and Strength

Huo

Huang²,

Han

et al. 2023

Materials

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This study provides the results of an experiment on the possibility of using high-volume ground granulated blast furnace slag (HVGGBFS)-based concrete as mass concrete. In addition to the control concrete, the total weight of the binder was 75% ground granulated blast furnace slag (GGBFS) and 25% ordinary Portland cement (OPC). For the aggregates, both natural and recycled aggregates were used. Three specimens with dimensions of 800 mm × 800 mm × 800 mm were prepared to simulate mass concrete. The workability, temperature aging and strength of the mass concrete were tested. The test results showed that utilizing HVGGBFS concrete as mass concrete can significantly reduce the heat of hydration due to the low heat of hydration of GGBFS, while the heat of hydration of GGBFS and recycled aggregate combination is 11.2% higher than normal concrete, with a slump that is 31.3% lower than that of plain concrete. The results also showed that the use of recycled aggregates in HVGGBFS concrete can significantly reduce workability. However, the compressive strength is higher than when natural aggregates are used due to the alkali activation effect caused by the recycled aggregates. The compressive strength at 7 and 28 days increased by 33.7% and 16.3%, respectively.

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Dynamic Characteristics and Chloride Resistance of Basalt and Polypropylene Fibers Reinforced Recycled Aggregate Concrete

Cited by 9 publications

References 33 publications

Performance Improvement of Recycled Concrete Aggregates and Their Potential Applications in Infrastructure: A Review

Performance Improvement of Recycled Concrete Aggregates and Their Potential Applications in Infrastructure: A Review

Multidimensional Transport Experiment and Simulation of Chloride Ions in Concrete Subject to Simulated Dry and Wet Cycles in a Marine Environment

Mass GGBFS Concrete Mixed with Recycled Aggregates as Alkali-Active Substances: Workability, Temperature History and Strength

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