Influence of concentration and proportion prepared bacteria on properties of self-healing concrete in sulfate environment

Riad, Islam; Elshami, Ahmed; Elshikh, Mohamed M. Yousry

doi:10.1007/s41062-021-00670-2

Cited by 16 publications

(9 citation statements)

References 33 publications

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“…Many studies have been conducted on the effect of recycled aggregate, mineral admixtures, and Nano silica on the mechanical properties and durability of concrete after immersion in aggressive medium. The recycled aggregate concrete mixtures containing slag gave the best overall performance, according to (Riad et al 2021;Berndt 2009) [21][22]. When recycled aggregate was used in concrete, durability tests revealed small improvements in coefficients of permeability and chlorine diffusion coefficient.…”

Section: Introductionmentioning

confidence: 99%

Behaviour of sustainable concretes modified with mineral admixtures and Nano-silica against aggressive media attacks

Ahmad

Elshami

Fawzy

2022

IOP Conf. Ser.: Earth Environ. Sci.

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The goal of this study is to see how the effect of recycled concrete aggregate admixed with mineral admixtures and Nano-silica on concrete's durability after being exposed to aggressive media attacks. The coarse aggregates applied in the concrete were dolomite (control) and recycled concrete aggregate with the addition of various mineral admixtures such as ground granulated blast slag (GGBFS), granite, and Nano-silica. To lower the water/cement ratio, a superplasticizer (SP)-type (F) was used. The physical and mechanical properties of commonly used raw materials such as aggregates and other various concrete kinds were investigated. The effects of saltwater and 3% sodium chloride on concrete mechanical and microstructures properties were investigated. The slump values of dolomite concrete were found to be lower than those of recycled aggregate concrete. The concrete mix using recyclable aggregate has the highest compressive strength, according to the results. In terms of compressive strength, the addition of 1% NS (Nano-silica) and 15% slag increased both mechanical and durability properties of the recycled aggregate concrete in aggressive media.

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Section: Introductionmentioning

confidence: 99%

Behaviour of sustainable concretes modified with mineral admixtures and Nano-silica against aggressive media attacks

Ahmad

Elshami

Fawzy

2022

IOP Conf. Ser.: Earth Environ. Sci.

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“…The result of this, however, is that abundant calcium hydroxide forms, and it seems that it is this calcium hydroxide that is the source of calcium used by the bacteria [ 99 ]. However, recent research has suggested that this can carbonate and be unavailable for future reactions, and delay or stop the SH effect [ 100 ]. In the case of the process of oxidation of amino acids, the most commonly used salts are in the form of calcium lactate, calcium nitrate, calcium formate, and calcium acetate [ 80 ].…”

Section: Influence Of Concrete Environment On Bacteria-based Self-hea...mentioning

confidence: 99%

“…The situation is similar regarding sulphate attack on the concrete matrix. Using the appropriate bacterial culture, sulphate resistance of bacterial-based SH concrete can be improved for 120 days [ 100 ], but the bacterial concentration and other requests for improving sulphate resistance have not been sufficiently investigated. In real-time environments, a concrete matrix is subjected to dry/wet cycles, and carbonation can occur before cracks appear.…”

Section: Influence Of Concrete Environment On Bacteria-based Self-hea...mentioning

confidence: 99%

Relationship between Bacterial Contribution and Self-Healing Effect of Cement-Based Materials

2022

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The civil research community has been attracted to self-healing bacterial-based concrete as a potential solution in the economy 4.0 era. This concept provides more sustainable material with a longer lifetime due to the reduction of crack appearance and the need for anthropogenic impact. Regardless of the achievements in this field, the gap in the understanding of the importance of the bacterial role in self-healing concrete remains. Therefore, understanding the bacterial life cycle in the self-healing effect of cement-based materials and selecting the most important relationship between bacterial contribution, self-healing effect, and material characteristics through the process of microbiologically (bacterially) induced carbonate precipitation is just the initial phase for potential applications in real environmental conditions. The concept of this study offers the possibility to recognize the importance of the bacterial life cycle in terms of application in extreme conditions of cement-based materials and maintaining bacterial roles during the self-healing effect.

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“…Also to understand the type of durability there is a difference between concrete made in a lab and concrete delivered in site [8]. Too often studies prescribe high strength, low w/b ratios, sometimes with high levels of SCM, and low slump and assume a durable structure [9]. That might be ne in a controlled lab (though low slump never is) but get it to site and the contractor can't place and compact it resulting in a non durable structure due to voids or possibly uncontrolled water addition [10].…”

Section: Introductionmentioning

confidence: 99%

Effects of Five Sources of Mixing Water on Durability of Concrete

Elshami

2023

Preprint

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This paper presents the experimental approach and the first results obtained as a result of the effect of five Sources of mixing water on produce more durable concrete. Five types of water were used, namely simulated acid rain (AR), Rain water (RW), tap water (TW), Zamzam water (ZW) and sea water (SW) as mixing water for ordinary portland cement concrete OPCC. The durability of these different types of water were tested toward their capacity to prevent the rebar corrosion. The results of workability, pH value, compressive strength, chlorides penetration and microstructure of different specimens mixed with each type of water were compared with those mixed with tap water (TW).

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Influence of concentration and proportion prepared bacteria on properties of self-healing concrete in sulfate environment

Cited by 16 publications

References 33 publications

Behaviour of sustainable concretes modified with mineral admixtures and Nano-silica against aggressive media attacks

Behaviour of sustainable concretes modified with mineral admixtures and Nano-silica against aggressive media attacks

Relationship between Bacterial Contribution and Self-Healing Effect of Cement-Based Materials

Effects of Five Sources of Mixing Water on Durability of Concrete

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