Mechanical Properties and Microcosmic Properties of Self-Compacting Concrete Modified by Compound Admixtures

Song, Yang; Qi, Bing; Ai, Zubin; Cao, Zhensheng; He, Shanying; Li, Lijun

doi:10.32604/jrm.2022.016653

Cited by 6 publications

(4 citation statements)

References 24 publications

(30 reference statements)

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“…However, in the study conducted by Moustafa et al [23], slump values fluctuated slightly at 150 mm when the proportion of the efficient water-reducing agent was changed. When the content of rubber particles does not exceed 40%, the mixing of slag powder and rubber particles results in the composite-modified self-compacting concrete having a better compatibility than the standard self-compacting concrete [47]. When rubber replaced 20% of the sand of geopolymer concrete, the compatibility was improved by 9%.…”

Section: Effect Of Rubber Content On Workabilitymentioning

confidence: 99%

Workability and Durability of Concrete Incorporating Waste Tire Rubber: A Review

Zhang¹,

Wang²,

Wang³

et al. 2023

Journal of Renewable Materials

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Environmental problems caused by waste tires are becoming increasingly prominent. There is an urgent need to find a green way to dispose of waste tires, and scholars have made considerable efforts in this regard. In the construction industry, rubber extracted from waste tires can be added to concrete to alleviate environmental problems to a certain extent. As a new building material, rubber concrete has superior properties compared to ordinary concrete and has been widely used in many fields. Numerous studies have been conducted worldwide to investigate the effect of waste tire rubber on the performance of concrete. It has been reported that the addition of waste tire rubber has a significant influence on the performance of concrete. Workability influences the hardened performance of rubber concrete, especially the durability. Based on the current research results, the workability and durability of concrete manufactured with waste tire rubber, including water absorption and permeability, carbonation resistance, chloride ion permeability resistance, and freeze-thaw resistance, are summarized in this paper. It is concluded that the addition of waste tires has a negative effect on the workability of concrete. In terms of durability, concrete exhibits better chloride ion penetration resistance and frost resistance, with a higher water absorption rate, and lower anti-permeability and carbonation resistance owing to the addition of waste tire rubber.

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Section: Effect Of Rubber Content On Workabilitymentioning

confidence: 99%

Workability and Durability of Concrete Incorporating Waste Tire Rubber: A Review

Zhang¹,

Wang²,

Wang³

et al. 2023

Journal of Renewable Materials

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“…Compound concrete had received attention from research researchers as a solution 9 – 11 . Sosa 12 et al mixed pyrophyllite, limestone, FA, and slag to obtain high-strength self-compacting concrete.…”

Section: Introductionmentioning

confidence: 99%

Research on mechanical properties of concrete by nano-TiC-BF-fly ash

Yang,

Yu,

et al. 2024

Sci Rep

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Ultra-high-rise buildings require high concrete bearing capacity. Ordinary concrete often fails to meet the project requirements. Admixture of admixtures in concrete is a means of solution. Currently, studies on the incorporation of basalt fiber (BF) and fly ash (FA) in concrete are relatively mature. However, research on incorporating nano-Titanium Carbide (nano-TiC) in concrete is still relatively scarce, which has a lot of room for development. To further improve the mechanical properties of concrete, BF, and FA synergized with nano-TiC were incorporated into concrete to produce TBF concrete in this study. And Response Surface Methodology (RSM) was used to optimize the mechanical properties of concrete. The collapse and compressive deformation damage characteristics of concrete were analyzed. The microstructure of the cement matrix was analyzed by the SEM (Scanning Electron Microscope). An optimization model of the TBF concrete craving function was developed. Optimized ratios with compressive, split tensile, and flexural strengths as response objectives were obtained, and the accuracy of the optimized ratios was investigated using the same experimental conditions. The results of the study showed that FA increased the collapse of concrete, while nano-TiC and BF decreased the collapse of concrete. Under uniaxial compression, nano-TiC, FA, and BF together incorporated into concrete can improve its compressive damage state. Moderate amounts of nano-TiC, BF, and FA could improve the mechanical properties of concrete. Their optimal mixing ratio admixtures were 0.88%, 0.24%, and 5.49%, respectively. And the measured values under the same conditions were compared with the predicted values. The maximum difference in compressive strength was 6.09%. The maximum difference in split tensile strength was 7.14%. The maximum difference in flexural strength was 8.45%. This indicated that the accuracy of the RSM optimization model was good. A moderate amount of nano-TiC, FA, and BF could improve the densification of concrete.

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“…Additionally, the use of water-reducing agents plays a pivotal role in enhancing the workability and rheological properties of SCC, thereby facilitating its self-compacting capabilities. These additives not only contribute to the improved fluidity and cohesiveness of the concrete but also have a profound impact on its overall performance in various construction applications [7][8][9]. The utilization of mineral admixtures in the production of SCC is a critical component, with the optimal replacement ratio of these admixtures for cement ranging between 25% and 35%.…”

Section: Introductionmentioning

confidence: 99%

Influence of Extra-Short Extra-Fine Steel Fibers on Mechanical Properties of Self-Compacting Concrete with Single-Doped Fly Ash

Yang,

Zeng,

Wang

et al. 2024

Buildings

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This study assesses the influence of extra-short extra-fine steel fibers on the performance of self-compacting concrete (SCC) modified with fly ash. Replacing standard steel fibers with volume fractions ranging from 0%, 1.5%, 3%, 5% and 6%, the study optimizes the mix design for enhanced workability and mechanical properties. The findings reveal that, although the addition of steel fibers had a negative effect on the flowability, the cohesion is significantly improved, providing a basis for a significant improvement in the mechanical properties. The optimal fiber content is identified at 5%, achieving the highest compressive strength of 71.7 MPa, split tensile strength of 8.2 MPa, and flexural strength of 12.8 MPa at 28 d. However, further increases in fiber content beyond 5% lead to a deceleration in compressive and splitting tensile strength improvement and a 27.5% drop in flexural strength at 28 d. The study also emphasizes the good dispersion within the concrete, which helps to enhance its ductility and crack resistance, to some extent.

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Mechanical Properties and Microcosmic Properties of Self-Compacting Concrete Modified by Compound Admixtures

Cited by 6 publications

References 24 publications

Workability and Durability of Concrete Incorporating Waste Tire Rubber: A Review

Workability and Durability of Concrete Incorporating Waste Tire Rubber: A Review

Research on mechanical properties of concrete by nano-TiC-BF-fly ash

Influence of Extra-Short Extra-Fine Steel Fibers on Mechanical Properties of Self-Compacting Concrete with Single-Doped Fly Ash

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