Recent advances in high strength lightweight concrete: From development strategies to practical applications

Lü, Jianxin

doi:10.1016/j.conbuildmat.2023.132905

Cited by 30 publications

(8 citation statements)

References 161 publications

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“…For a typical expanded clay-LWA-cast LWAC, its elastic modulus is generally in the range of 10-20 GPa. Therefore, these results are consistent with the literature [50,51].…”

Section: Fresh and Hardened Properties Of Concretesupporting

confidence: 94%

Applying Microbial-Induced Calcium Carbonate Precipitation Technology to Improve the Bond Strength of Lightweight Aggregate Concrete after High-Temperature Damage

Chen,

Lo,

Tang

et al. 2024

Applied Sciences

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High temperatures and external force can easily lead to a decline in the bond strength of reinforced concrete components. Microbial-induced calcium carbonate precipitation (MICP) technology has considerable potential for repairing concrete. Given this, this study utilized MICP technology to improve the bond strength of heat- and pull-damaged lightweight aggregate concrete (LWAC). The specimens of a control group (Group A) and two experimental groups (Group B and Group C) were prepared. The experimental group was prepared using lightweight aggregates (LWAs) that had been immersed in a nutrient solution and a bacterial solution. The control group was prepared using LWAs that were not immersed in a nutrient solution or bacterial solution. These specimens healed themselves in different ways after exposure to high temperatures (300 °C and 500 °C) and pull-out damage. Groups A and B adopted the same self-healing method; that is, their specimens were placed in a computer-controlled incubator at 40 °C. Group C used different self-healing methods. The specimens in this group were soaked in a mixed solution of urea and calcium acetate at 40 °C for two days and then taken out and placed in an incubator at 40 °C for two days. A cycle took four days until the expected self-healing age was reached. After being exposed to 300 °C and self-healed for 90 days, the residual bond strengths of the secondary pull-out tests in Groups A, B, and C were 20.63, 22.13, and 25.69 MPa, respectively. Moreover, compared with Group A, the relative bond strength ratios of the secondary pull-out tests in Groups B and C increased by 5.8% and 20.3%, respectively. This demonstrates that MICP technology could effectively improve the bond strength of LWAC after high-temperature and pull-out damage.

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“…For a typical expanded clay-LWA-cast LWAC, its elastic modulus is generally in the range of 10-20 GPa. Therefore, these results are consistent with the literature [50,51].…”

Section: Fresh and Hardened Properties Of Concretesupporting

confidence: 94%

Applying Microbial-Induced Calcium Carbonate Precipitation Technology to Improve the Bond Strength of Lightweight Aggregate Concrete after High-Temperature Damage

Chen,

Lo,

Tang

et al. 2024

Applied Sciences

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“…Among them, experimental group II had the highest value of 19.26 GPa, followed by experimental group I at 19.09 GPa, and the control group had the lowest value of 18.75 GPa. The elastic modulus of typical expanded clay LWA was in the range of 10–20 GPa [ 58 , 59 ]. Therefore, the results are consistent with the literature.…”

Section: Resultsmentioning

confidence: 99%

The Evaluation of the Effectiveness of Biomineralization Technology in Improving the Strength of Damaged Fiber-Reinforced LWAC

Chen,

Tang

et al. 2023

Materials

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Concrete cracks and local damage can affect the bond performance between concrete and steel bars, thereby reducing the durability of reinforced concrete structures. Compared with general concrete crack repair methods, biomineralization repair not only has effective bonding capabilities but is also particularly environmentally friendly. Therefore, this study aimed to apply biomineralization technology to repair damaged fiber-reinforced lightweight aggregate concrete (LWAC). Two groups of LWAC specimens were prepared. The experimental group used lightweight aggregates (LWAs) containing bacterial spores and nutrient sources, while the control group used LWAs without bacterial spores and nutrient sources. These specimens were first subjected to compression tests and pull-out tests, respectively, and thus were damaged. After the damaged specimen healed itself in different ways for 28 days, secondary compression and pull-out tests were conducted. The self-healing method of the control group involved placing the specimens in an incubator. The experimental group was divided into experimental group I and experimental group II according to the self-healing method. The self-healing method of experimental group I was the same as that of the control group. The self-healing method of experimental group II involved soaking the specimen in a mixed solution of urea and calcium acetate for two days, and then taking it out and placing it in an incubator for two days, with a cycle of four days. The test results show that in terms of the relative bond strength ratio, the experimental group II increased by 17.9% compared with the control group. Moreover, the precipitate formed at the cracks in the sample was confirmed to be calcium carbonate with the EDS and XRD analysis results, which improved the compressive strength and bond strength after self-healing. This indicates that the biomineralization self-healing method used in experimental group II is more effective.

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“…This may lead to considerable savings in terms of cost and environmental impacts, especially for high-rise construction. Other advantages may include enhanced earthquake response, formwork savings, enhanced insulation properties, improved fire resistance, and improved freezing and thawing resistance, to name a few [1,2]. Considering that aggregate occupies about 70-75% of the concrete's volume [3], lightweight concrete can be produced by using lightweight coarse and/or fine aggregates.…”

Section: Introductionmentioning

confidence: 99%

“…Tuff stones are volcanic sedimentary rocks formed from consolidated volcanic ash; they possess unique geological properties that make them characterized by their porous structure [8]. Tuff lightweight aggregate has been successfully used for the production of masonry concrete [9], insulating purposes [2], structural elements [10], and cement replacement material [11]. The production of structural lightweight concrete using Tuff aggregate requires a good mix design that guarantees highquality paste and good aggregate proportioning.…”

Section: Introductionmentioning

confidence: 99%

“…These variables are not only affecting the properties of the produced concrete but also its cost. On the other hand, the brittleness and porous nature of Tuff aggregate require the investigation of how to produce high-performance lightweight concrete using such aggregate [2]. Accordingly, many trial mixes should be investigated to optimize the produced concrete.…”

Section: Introductionmentioning

confidence: 99%

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Optimization of Tuff Stones Content in Lightweight Concrete Using Artificial Neural Networks

Yasin,

Awwad,

Malkawi

et al. 2023

Civ Eng J

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Tuff stones are volcanic sedimentary rocks formed by the consolidation of volcanic ash. They possess unique geological properties that make them attractive for a variety of construction and architectural applications. Considerable amounts and various types of Tuff stones exist in the eastern part of Jordan. However, the use of Tuff stones often requires experimental investigations that can significantly impact the accuracy of their physical and mechanical characteristics. To ensure consistent and predictable properties in their mix design, it is essential to minimize the effects of these experimental procedures. Artificial neural networks (ANNs) have emerged as a promising tool to address such challenges, leveraging their ability to analyze complex data and optimize concrete mix design. In this research, ANNs have been used to predict the optimum content of Tuff fine aggregate to produce structural lightweight concrete with a wide range (20 to 50 MPa) of compressive strength. Three different types of Tuff aggregates, namely gray, brown, and yellow Tuff, were experimentally investigated. A set of 68 mixes was produced by varying the fine-tuff aggregate content from 0 to 50%. Concrete cubes were cast and tested for their compressive strength. These samples were then used to form the input dataset and targets for ANN. ANN was created by incorporating the recent advancements in deep learning algorithms, and then it was trained, validated using data collected from the literature, and tested. Both experimental and ANN results showed that the optimum content of the various types of used Tuff fine aggregate ranges between 20 to 25%. The results revealed that there is a clear agreement between the predicted values using ANN and the experimental ones. The use of ANNs may help to cut costs, save time, and expand the applications of Tuff aggregate in lightweight concrete production. Doi: 10.28991/CEJ-2023-09-11-013 Full Text: PDF

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Recent advances in high strength lightweight concrete: From development strategies to practical applications

Cited by 30 publications

References 161 publications

Applying Microbial-Induced Calcium Carbonate Precipitation Technology to Improve the Bond Strength of Lightweight Aggregate Concrete after High-Temperature Damage

Applying Microbial-Induced Calcium Carbonate Precipitation Technology to Improve the Bond Strength of Lightweight Aggregate Concrete after High-Temperature Damage

The Evaluation of the Effectiveness of Biomineralization Technology in Improving the Strength of Damaged Fiber-Reinforced LWAC

Optimization of Tuff Stones Content in Lightweight Concrete Using Artificial Neural Networks

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