Application of ANN for prediction of chloride penetration resistance and concrete compressive strength

Mohamed, Osama Ahmed; Kewalramani, Manish; Ati, Modafar; Hawat, Waddah Al

doi:10.1016/j.mtla.2021.101123

Cited by 37 publications

(16 citation statements)

References 17 publications

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“…The physical and mechanical properties of conventional materials such as coarse and fine aggregates and materials such as iron tailings and polypropylene fiber used in the test have previously been discussed in the literature [ 17 ], and they met the Chinese specification requirements [ 22 , 23 ], which are not repeated here.…”

Section: Test Setupmentioning

confidence: 99%

“…Mohamed [ 16 ] developed a new artificial neural network calculation model for the prediction of the chloride permeability of self-compaction concrete, which was in good agreement with the test results. Professor Wang Sheliang from Xi’an University of Architecture and Technology conducted a series of detailed studies regarding the carbonization [ 17 , 18 ], salt spray erosion [ 19 ], freeze–thaw [ 20 ], and sulfate dry–wet cycle [ 21 ] of TRC, making great contributions to the popularization and application of recycled concrete.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of Erosion Characteristics and Erosion Mechanism of Polypropylene Fiber Tailings Recycled Concrete in Salt Spray Environment

Chen

Zhan

et al. 2022

Polymers

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Economic development and infrastructure improvement will inevitably lead to the accumulation of construction waste and tailings, which has not only a huge impact on the environment but is also a waste of resources. Recycling these resources and making green concrete is an effective way to solve these problems. In this study, the salt spray erosion characteristics and erosion mechanism of tailings recycled concrete (TRC) with polypropylene fibers were studied through macro and micro methods. The results showed that its compressive strength and splitting tensile strength increased at first and then decreased, with the optimum content of 0.6–0.9%, and the strength increase coefficient reached its maximum value at the erosion period being 14 d to 28 d. Under the same erosion cycle, when the fiber content was low (≤0.6–0.9%), the erosion depth hardly fluctuated. While the fiber content changed from 0.6% to 1.2%, the erosion depth and curing ability (erosion for 90 days) increased by 16.29% and 11.20%, which implied that its erosion resistance decreased sharply. Through SEM microscopic analysis, it could be observed that when the fiber content was low, the matrix structure and porosity had little change; while the fiber content was excessive, the porosity increased greatly. The longer the erosion period was, the greater the cumulative expansion of salt crystals was, and the larger the porosity was, whose results were in good agreement with the experimental results. This research provides a significant theoretical basis for the application of TRC in engineering.

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Section: Test Setupmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Analysis of Erosion Characteristics and Erosion Mechanism of Polypropylene Fiber Tailings Recycled Concrete in Salt Spray Environment

Chen

Zhan

et al. 2022

Polymers

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“…In unsaturated concrete, the rate of water ingress is controlled to great extent by absorption due to capillary rise. Studies have shown that ingress of water carrying harmful chlorides into concrete may lead to corrosion of reinforcing steel bars and jeopardize the integrity of the structural system [2]. The conveyance of chloride-bearing water to reinforcing steel through concrete is related fundamentally to the connectivity of the pore system, in addition to pore structure and microcracks.…”

Section: Introductionmentioning

confidence: 99%

Fresh Properties and Sulfuric Acid Resistance of Sustainable Mortar Using Alkali-Activated GGBS/Fly Ash Binder

Mohamed

Khattab

2022

Polymers

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In this study, sorptivity, setting time, resistance to sulfuric acid, and compressive strength of mortars that use alkali-activated GGBS and fly ash as binders, were evaluated experimentally. The activation of binders, was achieved at room temperature of 222 0C using combinations of sodium silicates (Na2SiO3) and sodium hydroxide (NaOH) solutions in ratios of 1.5, 2.0, and 2.5. The parameters considered in terms of their effects on fresh and hardened properties include: NaOH molarity, activator ratio Na2SiO3/NaOH, mortar sample age, and relative amount of GGBS/fly ash in binder combination. Sorptivity, change in mass, and compressive strength were determined for mortar samples that were submerged in 10% sulfuric acid solution for 7 days, 28 days, and 90 days. The binder for mortar samples tested at each of the specified ages consisted of 100% GGBS (G100), 75%GGBS+25% fly ash (G75F25), or 50% GGBS + 50% fly ash (G50F50). The binder was activated using Na2SiO3 solution, combined with 10M, 12M, 14M, or 16M NaOH solution. It was found that sorptivity decreases with increase in curing age, for all activator ratios, concentrations, and relative amounts of GGBS/fly ash. Binder consisting of 75%GGBS + 25% fly ash with NaOH concentration of 12M had the lowest sorptivity. Eexposure of alkali-activated GGBS/fly ash mortar samples to sulfate attack did not cause loss in mass nor visible signs of damage/deterioration. All binder combinations experienced increase in compressive strength after curing in 10%sufluric acid solution, with the optimum G75F25 mix achieving a 28-day strength of 80.53 MPa when NaOH molarity is 10M, which increased to 91.06 MPa after 90 days. Variation in concentration of NaOH didn’t cause significant change in the magnitudes of 28-day or 90 day compressive strengths of G50F50. However, despite slow dissolution of fly ash and immersion in 10% sulfuric acid solution, G50F50 developed 28-day compressive strength of 56.23 MPa and 90-day compressive of 86.73 MPa, which qualifies G50F50 as high strength mortar for practical purpose.

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“…The rate of water penetration through the pore system of unsaturated concrete is controlled largely by capillary rise absorption. Transport of deleterious chlorides by water through concrete pore system may cause corrosion of steel reinforcing bars and subsequent deterioration of the load-carrying capacity of the structural system 3 . Fly ash and ground granulated blast furnace slag (GGBS) are examples of supplementary cementitious materials (SCM) are capable of enhancing durability and strength of concrete when used as partial replacements of OPC 4 – 6 .…”

Section: Introductionmentioning

confidence: 99%

Effect of relative GGBS/fly contents and alkaline solution concentration on compressive strength development of geopolymer mortars subjected to sulfuric acid

Mohamed

Khattab

Hawat

2022

Sci Rep

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The effect of submerging geopolymer mortar samples in highly acidic solution for 7-, 28-, and 90-days on stability of mass and the development of compressive strength development was assessed experimentally. The mortar binder consisted of GGBS or blends of GGBS and fly ash activated using combinations of NaOH and Na2SiO3 solutions, and samples were cured in room temperature. It was found that maintaining mortar samples continuously under sulfuric acid doesn’t cause reduction compressive strength or mass from one age to the other, up to 90 days. While decalcification, delaumination, and formation of calcium salts due to sulfate attack may have affected mass and strength, submerging samples under water supported formation of geopolymerization products C-A-S-H and N-A-S-H, and consequently increased the mass and compressive strength of cubic mortar samples with fly ash + GGBS blended binder. The resistance of mortar to sulfuric acid remained consistent when mortars were prepared using GGBS:fly ash ratio of 3:1, equal amounts of GGBS and fly ash, and GGBS as sole binder. When geopolymer mortar samples made with each of the three binders was left exposed to air after casting, compressive strength increased from 7- to 28-days after casting, but at 90-days, all mortar samples experienced decrease in compressive strength relative to the 28-day values. The relatively high content of GGBS (≥ 50%) and absence of curing water in relatively dry conditions caused shrinkage cracking and decrease in compressive strength.

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Application of ANN for prediction of chloride penetration resistance and concrete compressive strength

Cited by 37 publications

References 17 publications

Analysis of Erosion Characteristics and Erosion Mechanism of Polypropylene Fiber Tailings Recycled Concrete in Salt Spray Environment

Analysis of Erosion Characteristics and Erosion Mechanism of Polypropylene Fiber Tailings Recycled Concrete in Salt Spray Environment

Fresh Properties and Sulfuric Acid Resistance of Sustainable Mortar Using Alkali-Activated GGBS/Fly Ash Binder

Effect of relative GGBS/fly contents and alkaline solution concentration on compressive strength development of geopolymer mortars subjected to sulfuric acid

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