Effects of fly ash, blast furnace slag and metakaolin on mechanical properties and durability of coral sand concrete

Cheng, Shi; Shui, Zhonghe; Sun, Tao; Yu, Rui; Zhang, Guozhi; Ding, Sha

doi:10.1016/j.clay.2017.02.026

Cited by 138 publications

(26 citation statements)

References 20 publications

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“…Researchers have also studied the effect of various mineral additives on the permeability of chloride ions. It was found that a proper amount of metakaolin (5 wt%), slag (15 wt%) (Cheng et al, 2017) or silica fume (4 wt%) (Wang et al, 2019b) effectively improved the resistance of CAC to chloride ion penetration, while the addition of fly ash (15%) increased the chloride diffusion coefficient of CAC. Similarly, other researchers have also concluded that a certain amount of fly ash could reduce the resistance of CAC to chloride ion permeability (Wu et al, 2018).…”

Section: Durabilitymentioning

confidence: 99%

Advances in coral aggregate concrete and its combination with FRP: A state-of-the-art review

Zhou

Feng

Yang

2020

Advances in Structural Engineering

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As an economical and eco-friendly construction material, coral aggregate concrete (CAC) plays an increasingly important role in emerging marine engineering applications. CAC fully utilizes local raw materials on remote islands. Due to the porous structure and low-strength characteristics of coral aggregates, CAC exhibits unique characteristics compared to ordinary concrete. This paper presents a state-of-the-art review of the properties of CAC, including (1) the physical properties of coral aggregates; (2) the mechanical properties of CAC under uniaxial and multiaxial compression; and (3) the durability of CAC especially its chloride ion resistance and performance under drying-wetting cycles. To overcome the challenges of steel corrosion in marine environments, fiber-reinforced polymer (FRP) has been indicated to be a promising material for applications in CAC construction. The latest studies on the combination of FRP and CAC are reviewed, including the use of FRP tubes and bars.

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Section: Durabilitymentioning

confidence: 99%

Advances in coral aggregate concrete and its combination with FRP: A state-of-the-art review

Zhou

Feng

Yang

2020

Advances in Structural Engineering

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“…In the present study, ARGF reinforced CAC (ARGF-CAC) is mixed by seawater, cement, ground granulated blast furnace slag (GGBFS), Class F fly ash (FA), metakaolin (MK), coral aggregates, and ARGF according to the literature [19]. All of the water used in the test is artificial seawater simulating the water in South China Sea [13].…”

Section: Raw Materialsmentioning

confidence: 99%

“…Lyu et al [18] analyzed the effects of sphericity, angular number and index, shape, and texture of coral particles on the properties of CAC. Incorporations of fly ash, blast furnace slag and metakaolin into CAC can improve the durability of the resulting concrete [19]. As the curing age increases, some of the water in the pre-soaked aggregates would be released and further hydration reaction occurs, which results in subsequent strength improvement [20].…”

Section: Introductionmentioning

confidence: 99%

Properties of Alkali-Resistant Glass Fiber Reinforced Coral Aggregate Concrete

Yang

Dong

et al. 2020

Materials

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The intention of this paper is to analyze the properties of coral aggregate concrete (CAC) that is reinforced by alkali-resistant glass fibers (ARGF) and the bond performance with BFRP (basalt fiber reinforced polymer) bars. Two types of ARGF, denoted by Type A and Type B with different manufacturing technologies and fiber lengths, are used in the test. Tests of compressive strength, splitting tensile strength, and flexural performance were performed on ARGF-CAC with four different contents for the two types of ARGF. It is found that the cubic compressive strength is slightly reduced when the fiber volume fraction exceeds 0.5%, but almost keeps invariable if the fiber content further increases. However, the tensile strength, residual strength retention and flexural toughness are improved as more ARGFs are added into CAC, and even higher with Type B ARGF addition. The optimized volume fraction is 1.5% for both the two types of ARGF based on the evaluation of the workability and mechanical performance. Moreover, central pull-out test was performed to study the bond properties of ARGF-CAC with BFRP bars. It is found that both the maximum average bond stress and residual frictional stress are generally reduced as the bond length is longer. The addition of Type B ARGFs can significantly improve the bond strength; however, the Type A ARGFs seem to have marginal effect.

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“…However, adding supplementary cementitious materials can solve this problem. Cheng et al [8] found that the 28-day mechanical strength of coral concrete is higher than that of ordinary concrete, owing to the incorporation of metakaolin and blast furnace slag. Furthermore, the workability, volume stability, and durability of coral concrete has also been studied [9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Dynamic Mechanical Behavior of Fiber-Reinforced Seawater Coral Mortars

Long

Tang

et al. 2019

Materials

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Coral aggregate has been widely used for island construction because of its local availability. However, the addition of coral aggregate exaggerates the brittle nature of cement-based materials under dynamic loading. In this study, polyvinyl alcohol (PVA) fiber was used to improve dynamic mechanical behavior of seawater coral mortars (SCMs). The effects of coral aggregate and PVA fiber on the workability, static mechanical strengths, and dynamic mechanical behavior of fiber-reinforced SCMs were investigated. Results showed that the workability of the SCM decreased with increasing coral aggregate replacement rate and PVA fiber content. Mechanical strengths of the SCM increased with increasing PVA fiber content, but decreased with increasing coral aggregate replacement rate. Dynamic mechanical behavior at varying coral aggregate replacement rates was analyzed by combining dynamic mechanical analysis and micro-scale elastic modulus experiment. With increasing coral aggregate replacement rate, the storage modulus, loss factor, and elastic modulus of the interfacial transition zone in the SCM decreased. Nevertheless, with the incorporation of PVA fibers (1 vol.%), the storage modulus and loss factor were improved dramatically by 151.9 and 73.3%, respectively, compared with the reference group. Therefore, fiber-reinforced coral mortars have a great potential for use in island construction, owing to the excellent anti-vibrational performance.

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Effects of fly ash, blast furnace slag and metakaolin on mechanical properties and durability of coral sand concrete

Cited by 138 publications

References 20 publications

Advances in coral aggregate concrete and its combination with FRP: A state-of-the-art review

Advances in coral aggregate concrete and its combination with FRP: A state-of-the-art review

Properties of Alkali-Resistant Glass Fiber Reinforced Coral Aggregate Concrete

Dynamic Mechanical Behavior of Fiber-Reinforced Seawater Coral Mortars

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