Influence of an extrusion approach on the fiber orientation and mechanical properties of engineering cementitious composite

Ge, Zhi; Tawfek, Abdullah M.; Zhang, Hongzhi; Yang, Yinping; Yuan, Huaqiang; Sun, Renjuan; Wang, Zheng

doi:10.1016/j.conbuildmat.2021.124876

Cited by 30 publications

(17 citation statements)

References 39 publications

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“…For several design codes, the calculation formulas of concrete strength, concrete slump, and concrete carbonation depth might be not the same as the equations present in this research [26,33]. Although the details of calculation equations may be not the same, the fundamental process of the genetic algorithm might be similar [34,35]. Hence, the suggested method might be a general technique of the production of sustainable concrete for different design codes.…”

Section: Discussionmentioning

confidence: 87%

Energy Optimization Design of Limestone Hybrid Concrete in Consideration of Stress Levels and Carbonation Resistance

Wang

Lin

et al. 2022

Buildings

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This research describes a genetic algorithm-based process for the optimization design of sustainable concrete with limestone powder. The objective of the optimization design was set as the embodied energy. The restraints of the optimization design consist of strength, workability, and carbonation resistance along with stress. The result of the research is shown as follows: (1) for low-strength concrete, carbonation dominates the mixture design of limestone hybrid concrete. Furthermore, the levels of stress and stress types modify the carbonation and optimization mixtures. The influence of tensile stress on optimization mixtures was much more apparent than compressive stress. (2) For concrete with high strength, strength dominates the mixture design of limestone hybrid concrete. (3) The optimization mixtures with low carbon footprints overlapped with those with low embodied energy. In addition, the new knowledge of the research is shown as follows: (1) find the decisive factor of concrete mixture design, (2) show a material design method considering structural stress, and (3) validate for various aims of optimal material design. In summary, the proposed model can be regarded as a common approach for the design of concrete mixture in consideration of strength, workability, carbonation resistance, and structural stress.

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Section: Discussionmentioning

confidence: 87%

Energy Optimization Design of Limestone Hybrid Concrete in Consideration of Stress Levels and Carbonation Resistance

Wang

Lin

et al. 2022

Buildings

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“…When fly ash replaces partial Portland cement because of the dilution effect, the degree of hydration of cement increases [11,25]. The amount of anhydrous cement is reduced and the waste of resources can be eliminated [33,34].…”

Section: Discussionmentioning

confidence: 99%

“…Fifth, some limitations of this study need to be improved, such as the strength model considering hydration products other than CSH and the CO 2 emissions model considering the aggregate, transportation process and production process [33,34]. Moreover, this study focuses on the material design.…”

Section: Discussionmentioning

confidence: 99%

Compressive Strength Estimation and CO2 Reduction Design of Fly Ash Composite Concrete

2022

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Fly ash is broadly utilized to produce concrete materials. This study presents a strength estimation model and a CO2 reduction design method for concrete with fly ash. First, a hydration-based strength (HBS) model is proposed for the evaluation of strength development at different ages of fly ash composite concrete with different mix proportions. Second, CO2 emissions for 1 MPa strength were evaluated. The analysis results show that, as the fly ash-to-binder ratio (FA/B) increased, the CO2 emissions for 1 MPa strength decreased. For concrete with a low water-to-binder ratio (W/B), the addition of high content of fly ash had an obvious dilution effect, which increased the reaction degree of cement and reduced CO2 emissions for 1 MPa strength. Moreover, the extension of the design age could reduce CO2 emissions for 1 MPa strength. Third, a genetic-algorithm-based optimal design model is proposed to find the individual mass of cement and fly ash of low-CO2 concrete. The analysis results show that, as the water contents increased from 160 to 170 kg/m3, to obtain the same strength, cement mass and fly ash mass increased, while the water/binder ratio and fly ash/binder ratio did not change. This means that the reduction in mixed water is one feasible way to lower CO2 emissions. In summary, the proposed strength–emission integrated analysis method is useful for designing sustainable fly ash composite concrete with the desired strength and low levels of CO2 emissions.

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“…The durability aspect, including the service life of carbonation durability, is seldom considered. The late age reaction of the mineral admixture effectively improves the concrete strength, while the carbonation resistance is impaired due to the utilization of the mineral admixture [16,17]. Hence, the carbonation service life should be considered for the design of blended concrete.…”

Section: Introductionmentioning

confidence: 99%

Optimal Design of Low-Carbon Concrete Containing Fly Ash and Limestone Powder

Wang¹

2022

Ceramics - Silikaty

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Fly ash and limestone powder are common admixtures in environmentally friendly concrete production. This paper proposes an optimal design method for low-carbon concrete containing fly ash and limestone powder. This design method considers the influence of strength (30, 40, and 50 MPa) and carbonization service life (50 and 100 years). The genetic algorithm was utilized to determine the optimal global solution, which satisfies different constraints and can find the decisive factor of the concrete mixture design. The analytical results are as follows: When the carbonization service life is 50 years, for ordinary-strength concrete (30 MPa), carbonation durability is the decisive factor in the mixture design, while for medium-(40 MPa) and high-strength (50 MPa) concrete, strength is the decisive factor. When the carbonation service life is 100 years, for ordinary-(30 MPa) and medium-strength (40 MPa) concrete, carbonation durability is the decisive factor for the mixture design, while for high-strength (50 MPa) concrete, compressive strength is the decisive factor. Furthermore, the CO2 emissions, compressive strength, and water-binder ratio of the optimized concrete design results are in line with the actual project, which proves the effectiveness of the proposed method.

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Influence of an extrusion approach on the fiber orientation and mechanical properties of engineering cementitious composite

Cited by 30 publications

References 39 publications

Energy Optimization Design of Limestone Hybrid Concrete in Consideration of Stress Levels and Carbonation Resistance

Energy Optimization Design of Limestone Hybrid Concrete in Consideration of Stress Levels and Carbonation Resistance

Compressive Strength Estimation and CO2 Reduction Design of Fly Ash Composite Concrete

Optimal Design of Low-Carbon Concrete Containing Fly Ash and Limestone Powder

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