Coarse aggregate effectiveness in concrete: Quantitative models study on paste thickness, mortar thickness and compressive strength

Wu, Miaomiao; Zhang, Bingliu; Xu, Guangyou; Cai, Jiwei; Xiong, Xiaoli; Zhao, Deqiang

doi:10.1016/j.conbuildmat.2021.123171

Cited by 19 publications

(3 citation statements)

References 34 publications

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“…Larger aggregates can also be added in varying quantities to improve the mechanical resistance of concrete. The effect of large aggregates in 3DCP has been investigated in [60], however this study did not consider any variable gradation. The implementation of an on-demand mixing system is particularly challenging due to the differences in the pumpability of concrete mixes with different maximum particle sizes.…”

Section: Variable Addition Of Particlesmentioning

confidence: 99%

Grading Material Properties in 3D Printed Concrete Structures

Vargas

Westerlind

Silfwerbrand

2022

Nordic Concrete Research

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Functionally graded materials (FGMs) describe composite materials with a gradual change in properties along one or several axes. A major advantage with this approach is the avoidance of discontinuities between different layers of material. 3D Printing offers the possibility to control the material composition and spatial placement along the printing process to create structures with graded properties. However, there are very few examples of the application of this approach to 3D concrete printing (3DCP). This paper presents a review of the current approaches of and methods to grade the material properties of a 3DCP structure, as well as a review of similar methods used in other 3D printing processes. Finally, the potential applicability of these principles into concrete are presented and discussed.

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Section: Variable Addition Of Particlesmentioning

confidence: 99%

Grading Material Properties in 3D Printed Concrete Structures

Vargas

Westerlind

Silfwerbrand

2022

Nordic Concrete Research

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“…Image Processing. Two-dimensional image processing is widely used to quantitatively characterize the mesostructure of concrete [25,26]. It was used to measure the aggregate concentration and mortar thickness between two adjacent aggregate particles on the frozen surface of concrete specimens.…”

Section: Pore Characteristicsmentioning

confidence: 99%

Influence of Coarse Aggregate Concentration on the Frost Resistance of Non-Air-Entrained Concrete

Cai

Wang

et al. 2022

Journal of Engineering

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Aggregate-interlocking concrete is a kind of low-carbon and high-performance concrete, while the aggregate-interlocking concrete prepared by the distributing-filling coarse aggregate (DFCA) process worsens frost resistance than ordinary concrete. In order to better apply the aggregate-interlocking concrete, it is necessary to figure out the relationship between the frost resistance and the coarse aggregate concentration. In the study, three series of concretes, C30, C40, and C50, are designed, and the charge passed, scaling mass, water uptake, and penetration depth of NaCl solution are tested as indicators to account for the relationship between frost resistance and coarse aggregate concentration. The results indicate that aggregate still has a strong restraint effect on the permeability of concrete after freezing-thawing cycling, but compared to the unfrozen concrete, the charge passed of the concrete with higher aggregate concentration tends to increase more intensively. The scaling happens at both bulk mortar and interfaces between aggregate and mortar. The increase in aggregate concentration could restrain the scaling of mortar, but excessive aggregate concentration results in a significant increase in scaling mass. The concrete with higher coarse aggregate concentration could absorb more water during the freezing-thawing cycling, and the penetration depth of NaCl solution also increases with the increase of coarse aggregate concentration. The results reveal that the increase in aggregate concentration degrades the frost resistance of concrete, and the DFCA process could be applied in high-strength concrete to mitigate the negative effect of coarse aggregate on the frost resistance of concrete.

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“…Adding CKD is an effective solution to stabilise the ground for the construction of infrastructure, buildings and roads (Rimal et al, 2019). Besides, adding CKD increases compressive strength (Ribeiro and Morelli, 2009;Shoaei et al, 2017;Shen et al, 2021), resistivity and durability of soils (Abdel-Gawwad et al, 2019; Yaseri et al, 2019). The benefits of CKD as an additive binder in cement consist in increased tensile strength and improved characteristics of cement (Baghriche et al, 2020;Silva et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Different Binder Combinations of Cement, Slag and CKD for S/S Treatment of TBT Contaminated Sediments

Lindh

Lemenkova

2021

Acta Mechanica Et Automatica

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The seabed in the ports needs to be regularly cleaned from the marine sediments for safe navigation. Sediments contaminated by tributyltin (TBT) are environmentally harmful and require treatment before recycling. Treatment methods include leaching, stabilisation and solidification to remove toxic chemicals from the sediments and improve their strength for reuse in the construction works. This study evaluated the effects of adding three different binder components (cement, cement kiln dust (CKD) and slag) to treat sediment samples collected in the port of Gothenburg. The goal of this study is to assess the leaching of TBT from the dredged marine sediments contaminated by TBT. The various methods employed for the treatment of sediments include the application of varied ratios of binders. The project has been performed by the Swedish Geotechnical Institute (SGI) on behalf of the Cementa (HeidelbergCement Group) and Cowi Consulting Group, within the framework of the Arendal project. An experiment has been designed to evaluate the effects of adding CKD while reducing cement and slag for sediment treatment. Methods that have been adopted include laboratory processing of samples for leaching using different binder combinations, followed by statistical data processing and graphical plotting. The results of the experiment on leaching of TBT for all samples are tested with a varied ratio of cement, slag, CKD and water. Specimens with added binders ‘cement/CKD’ have demonstrated higher leaching compared to the ratio ‘cement/slag/CKD’ and ‘cement/slag’. The ‘CKD/slag’ ratio has presented the best results followed by the ‘cement/slag/CKD’, and can be used as an effective method of s/s treatment of the sediments. The results have shown that the replacement of cement and slag by CKD is effective at TBT leaching for the treatment of toxic marine sediments contaminated by TBT.

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Coarse aggregate effectiveness in concrete: Quantitative models study on paste thickness, mortar thickness and compressive strength

Cited by 19 publications

References 34 publications

Grading Material Properties in 3D Printed Concrete Structures

Grading Material Properties in 3D Printed Concrete Structures

Influence of Coarse Aggregate Concentration on the Frost Resistance of Non-Air-Entrained Concrete

Evaluation of Different Binder Combinations of Cement, Slag and CKD for S/S Treatment of TBT Contaminated Sediments

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