Effects of w/b ratio, fly ash, limestone calcined clay, seawater and sea-sand on workability, mechanical properties, drying shrinkage behavior and micro-structural characteristics of concrete

An, Ran; Jiang, Zhilu; Jin, Hesong; Zhu, Ji-Hua; Liu, Wei; Huang, Zhenyu; Xing, Feng; Liu, Jiaying; Xu, Fan; Sui, Tongbo

doi:10.1016/j.conbuildmat.2022.126333

Cited by 54 publications

(11 citation statements)

References 65 publications

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“…On the other hand, in a steam-curing environment, the steam kept the shrinkage process from drying up, preserving the samples' strength. The results of this study contributed to the potential of using seawater as well as sea sand in the manufacture of geopolymer concretes [2,[17][18][19].…”

Section: Introductionmentioning

confidence: 72%

“…Furthermore, it was found that changing the slag/fly ash ratio resulted in a change in the amount of chloride adsorption because the reaction products changed by changing this ratio in alkali activated slag/fly ash pastes [16]. In a different research, increasing the temperature enhanced the physical and chemical absorption of chloride ions in the gel matrix [17,18]. Because N-A-S-H gel's capacity for chloride ion adsorption increased with rising temperature.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Seawater on the Mechanical Strength of Geopolymer/Cement Stabilized Sandy Soils

Samadi¹,

Ghodrati²,

Ghadir³

2023

Proceedings of the TMIC 2022 Slope Stability Conference (TMIC 2022)

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Freshwater supply for stabilizing sandy soils is one of the significant challenges in coastal regions. On the other hand, Ordindary Portland cement (OPC) has several limitations in the exposure to saline environments. Geopolymers, as environmentally friendly soil stabilizers, have been widely used in soil stabilization research. In this paper, the effects of natural seawater (SW) on the mechanical and microstructural properties of Portland cement/geopolymer stabilized sandy soils were studied. The soil samples were prepared with freshwater as reference samples. The impacts of binder type, slag replacement, curing duration, and curing conditions on the mechanical strength of stabilized soil samples were investigated. SEM images were used for microstructural analysis of the geopolymer stabilized soil samples. The results indicated that the use of seawater in stabilizing soil resulted in higher strength development in short-term (28 days) compared to the distilled water-based samples. However, seawater adversely affected the soil's long-term (90 days) strength. In addition, the strength of slag-based samples was generally higher than the strength of OPC and VA-based samples. Therefore, alkali-activated slag can be a potential replacement for OPC paste in stabilizing sandy soils. The SEM images revealed that using seawater led to the alteration of cementitious gels in comparison to distilled water.

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Section: Introductionmentioning

confidence: 72%

Section: Introductionmentioning

confidence: 99%

Effect of Seawater on the Mechanical Strength of Geopolymer/Cement Stabilized Sandy Soils

Samadi¹,

Ghodrati²,

Ghadir³

2023

Proceedings of the TMIC 2022 Slope Stability Conference (TMIC 2022)

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“…The mechanical properties of fly ash-based geopolymer are comparable to those of OPC [25,26]. Furthermore, the performance of the low-calcium fly ash geopolymer is superior to the OPC concrete in terms of durability properties [27,28] and fire resistance [29]. The performance of the GPC can be further enhanced by employing certain additives.…”

Section: Introductionmentioning

confidence: 97%

Development of Detailed Mix Design Methodology for Low Calcium Fly Ash Based Geopolymer Concrete Incorporating OPC and Crumb Rubber

Gill

Parveen

2022

Infrastructures

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This experimental study proposes a systematic mix-design procedure to develop rubberized geopolymer concrete (RGPC). The developed method is meant to identify the mix ratios for the production of high-strength, low-calcium fly ash-based geopolymer concrete, with OPC as a supplementary binder and crumb rubber as a partial replacement for the fine aggregates. The binder (80% fly ash + 20% OPC) content (350, 375, and 400 kg/m3), crumb rubber percentage (0, 5, 10, and 15%), and NaOH molarity (8, 10, and 12 M) are identified as key variables, with the focus on attaining the targeted compressive strength and workability under heat curing (60 °C). Thirty-six mix designs were tested for their compressive strength after 7 and 28 days, and their graphical relationship with the chosen variables is presented (CR-GPC graphs). A trial experiment with an example is performed to establish the validity of the developed mix-design procedure. It was found that the targeted compressive strength and slump of the rubberized GPC can be achieved with conviction.

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“…To maintain the normal operation of the transport lines, the transportation department needs to continue the health inspection of highways and tunnels regularly. In highway and tunnel engineering structures, the proportion of concrete consumption is the highest, and shrinkage cracks, broken plates, and ash will cause concrete quality defects, which will not only affect the overall beauty but also affect the quality of the highway and tunnel [ 4 ]. Among them, shrinkage concrete cracks are common concrete problems, which are manifested in the process of condensation.…”

Section: Introductionmentioning

confidence: 99%

Concrete Surface Crack Recognition Based on Coordinate Attention Neural Networks

Zhang

Wang

2022

Computational Intelligence and Neuroscience

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In highway transportation infrastructure such as highways and tunnels, the proportion of concrete consumption is the highest, and concrete cracks are common concrete problems. Concrete cracks will greatly affect the bearing capacity and safety of the structure, easily leading to the interruption of transportation lines, causing great economic losses, and endangering personnel safety. Therefore, the effective identification and timely reporting of concrete cracks is of great significance for the maintenance of infrastructure such as roads and tunnels. In this paper, the CaNet, a deep learning network for identifying concrete cracks, is proposed, which takes ResNet50 as the backbone network. In order to capture the area with a small proportion of cracks, we added coordinate attention to the residual unit of ResNet50 to capture the cross-channel information, direction-aware information, and position-sensitive information from many vertical and horizontal directions so that the network can more accurately locate the narrow crack area. In experiments 3.2 and 3.3, the CaNet has an accuracy rate of 89.6%, which is higher than that of the compared network. In addition, the recall, F1 score, and precision of the CaNet network are 86%, 85%, and 87% , respectively. Therefore, the CaNet model is effective for identifying concrete cracks.

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Effects of w/b ratio, fly ash, limestone calcined clay, seawater and sea-sand on workability, mechanical properties, drying shrinkage behavior and micro-structural characteristics of concrete

Cited by 54 publications

References 65 publications

Effect of Seawater on the Mechanical Strength of Geopolymer/Cement Stabilized Sandy Soils

Effect of Seawater on the Mechanical Strength of Geopolymer/Cement Stabilized Sandy Soils

Development of Detailed Mix Design Methodology for Low Calcium Fly Ash Based Geopolymer Concrete Incorporating OPC and Crumb Rubber

Concrete Surface Crack Recognition Based on Coordinate Attention Neural Networks

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