Effects of different mineral admixtures on carbonation resistance of lightweight aggregate concrete

Gao, Yingli; Cheng, Long; Gao, Zheming; Guo, Shiying

doi:10.1016/j.conbuildmat.2013.02.038

Cited by 63 publications

(16 citation statements)

References 16 publications

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“…This chloride diffusion test was conducted from September 2013 to December 2018. The fly ash concrete specimens were made with P.O 42.5 cement and fly ash of grade II [24]. Their chemical compositions are listed in Table 1.…”

Section: Methodsmentioning

confidence: 99%

Experimental Investigation and Analytical Modeling of Chloride Diffusivity of Fly Ash Concrete

et al. 2020

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Owing to its importance in the assessment of reinforced concrete structures, it is essential to determine the chloride diffusivity of fly ash concrete. This paper presents an investigation into the diffusion characteristics of chloride ions in fly ash concrete. Through experiment, the relationship between chloride diffusivity and curing age up to 1800 days is measured and the effects of curing age, water/binder ratio, aggregate volume fraction, and fly ash content (i.e., percentage of total cementitious material by mass) on chloride diffusivity are evaluated. It is found that the chloride diffusivity decreases with the increase of curing age, aggregate volume fraction, and fly ash content, but increases with the increase of water/binder ratio. In analytical modeling, an equivalent aggregate model is constructed and the equivalent interfacial transition zone (ITZ) thickness is derived analytically. With the equivalent aggregate model, three-phase fly ash concrete reduces to a two-phase composite material. By extending the Maxwell method, the chloride diffusivity of fly ash concrete is formulated. Finally, the validity of the analytical method is verified by experimental results.

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Section: Methodsmentioning

confidence: 99%

Experimental Investigation and Analytical Modeling of Chloride Diffusivity of Fly Ash Concrete

et al. 2020

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“…Apart from the w/b ratio, the mineral admixture is another important factor that determines the carbonation resistance of the LWAC. Gao [111] investigated the impacts of mineral admixtures on the carbonation resistance of the LWAC, and the results indicated that the carbonation resistance of the LWAC is significantly different with various mineral admixtures. In this study, grade II fly ash, pulverized fly ash, granulated blast furnace slag, and steel slag powders were selected as typical mineral admixtures to replace Portland cement and the shale haydite was used for lightweight aggregate.…”

Section: Carbonation-induced Corrosionmentioning

confidence: 99%

Green and Durable Lightweight Aggregate Concrete: The Role of Waste and Recycled Materials

et al. 2020

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Lightweight aggregate concrete manufactured by solid waste or recycled by-products is a burgeoning topic in construction and building materials. It has significant merits in mitigating the negative impact on the environment during the manufacturing of Portland cement and reduces the consumption of natural resources. In this review article, the agricultural and industrial wastes and by-products, which were used as cementitious materials and artificial lightweight aggregate concrete, are summarized. Besides, the mechanical properties, durability, and a few advanced microstructure characterization methods were reviewed as well. This review also provides a look to the future research trends that may help address the challenges or further enhance the environmental benefits of lightweight aggregate concrete manufactured with solid waste and recycled by-products.

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“…However, the authors found higher carbonation rates in ternary mixtures with FA and SF, which means that, in this case, the refinement of the paste microstructure was less relevant than the reduction of carbonatable substances. Gao et al [99] studied the influence of 20–30% OPC replacement of coarse FA and pulverized FA on the accelerated carbonation resistance (20% CO 2 ) of SLWAC with w/b of 0.31, up to 56 days. The carbonation depth and pH solution in SLWAC with FA was higher than in reference SLWAC with OPC.…”

Section: Carbonationmentioning

confidence: 99%

A Review on the Carbonation and Chloride Penetration Resistance of Structural Lightweight Aggregate Concrete

Bogas

Real

2019

Materials

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This paper presents a comprehensive review on structural lightweight aggregate concrete (SLWAC) durability. The main transport properties and degradation mechanisms of reinforced concrete are addressed, namely, carbonation and chloride attack. The influence of the main composition parameters, such as type of aggregate, type of binder and water/binder ratio, as well as the influence of cracking, are also analysed. Finally, the current knowledge of SLWAC’s service life prediction is assessed. Although the knowledge of SLWAC’s durability behaviour is still limited, investigation works performed either in laboratory or in real environments indicate that SLWAC can have similar to better durability performance than normal weight concrete, especially when the same strength level is considered. The importance of the quality of the paste over the characteristics of the lightweight aggregates is highlighted. Durability standardization regarding SLWAC is still insufficient and is one of the main gaps of current knowledge. The objective of this review is to foster a better understanding on the durability and service life prediction of SLWAC, contributing to a greater confidence in using this type of concrete.

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Effects of different mineral admixtures on carbonation resistance of lightweight aggregate concrete

Cited by 63 publications

References 16 publications

Experimental Investigation and Analytical Modeling of Chloride Diffusivity of Fly Ash Concrete

Experimental Investigation and Analytical Modeling of Chloride Diffusivity of Fly Ash Concrete

Green and Durable Lightweight Aggregate Concrete: The Role of Waste and Recycled Materials

A Review on the Carbonation and Chloride Penetration Resistance of Structural Lightweight Aggregate Concrete

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