Effect of meso‐structure on strength and size effect in concrete under tension

Murali, K. R.; Deb, Arghya

doi:10.1002/nag.2721

Cited by 9 publications

(7 citation statements)

References 30 publications

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“…7.1, [58]). The material heterogeneity slightly augments the size effect [32]. The concrete brittleness also decreased with decreasing specimen diameter.…”

Section: Size Effect: Comparison Of Dem Predictions and Experimental mentioning

confidence: 89%

“…DEM was also used to reproduce damage in concrete by other researchers [20][21][22][23][24]. The splitting test for concrete was simulated within continuum mechanics [25][26][27][28][29][30] and discrete mechanics using DEM [31][32][33]. A simplified geometric meso-structure was however assumed in DEM calculations [31][32][33].…”

Section: Introductionmentioning

confidence: 99%

“…The splitting test for concrete was simulated within continuum mechanics [25][26][27][28][29][30] and discrete mechanics using DEM [31][32][33]. A simplified geometric meso-structure was however assumed in DEM calculations [31][32][33]. The size effect was found to increase with growing heterogeneity intensity [32].…”

Section: Introductionmentioning

confidence: 99%

“…A simplified geometric meso-structure was however assumed in DEM calculations [31][32][33]. The size effect was found to increase with growing heterogeneity intensity [32].…”

Section: Introductionmentioning

confidence: 99%

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Meso-scale analyses of size effect in brittle materials using DEM

et al. 2018

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The paper describes numerical meso-scale results of a size effect on strength, brittleness and fracture in brittle materials like concrete. The discrete element method (DEM) was used to simulate the size effect during quasi-static splitting tension with the experimental-based meso-structure. The two-dimensional (2D) calculations were carried out on concrete cylindrical specimens with two diameters wherein two different failure modes occurred (quasi-brittle and very brittle with the snap-back instability). Concrete was modelled as a random heterogeneous 4-phase material composed of aggregate particles, cement matrix, interfacial transitional zones and macro-voids, based on x-ray micro-CT-images of the real concrete meso-structure. Attention was paid to the effect of the different specimen diameter on both the strength, brittleness and fracture pattern. Each internal energy component was analyzed in the fracture process zone and beyond it, and compared for the different post-peak behaviour of concrete. The evolutions of the number of broken contacts, coordination number, crack displacements and normal contact forces were also shown. Of specific interest was the fracture initiation and formation of two different failure modes. Next, the 2D DEM results of a size effect for 4 different specimen diameters were directly compared with corresponding experiments from the research literature. The experimental size effect was realistically reproduced in numerical calculations, i.e. the concrete strength and ductility decreased with increasing concrete specimen diameter. The calculated decreasing strength approached an asymptote with increasing cylindrical specimen diameter within the considered specimen size range.

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“…7.1, [58]). The material heterogeneity slightly augments the size effect [32]. The concrete brittleness also decreased with decreasing specimen diameter.…”

Section: Size Effect: Comparison Of Dem Predictions and Experimental mentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…A simplified geometric meso-structure was however assumed in DEM calculations [31][32][33]. The size effect was found to increase with growing heterogeneity intensity [32].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Meso-scale analyses of size effect in brittle materials using DEM

et al. 2018

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“…Before conducting the simulations, the range for each parameter used in previous published studies [38,40,45,46,47,48,49] was compiled. Several parameters in the flat joint model were then assigned the most commonly used values (see Table 2).…”

Section: The Discrete Element Methodsmentioning

confidence: 99%

Discrete Element Mesoscale Modeling of Recycled Lump Concrete under Axial Compression

Yong

2019

Materials

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In the past decade, directly reusing large pieces of coarsely crushed concrete (referred to as demolished concrete lumps or DCLs) with fresh concrete in new construction was demonstrated as an efficient technique for the recycling of waste concrete. Previous studies investigated the mechanical properties of recycled lump concrete (RLC) containing different sizes of DCLs; however, for actual application of this kind of concrete, little information is known about the influence of the spatial locations of DCLs and coarse aggregates on the concrete strength. Moreover, the mechanical responses of such a concrete containing various shapes of DCLs are also not well illustrated. To add knowledge related to these topics, two-dimensional mesoscale simulations of RLC containing DCLs under axial compression were performed using the discrete element method. The main variables of interest were the relative strength of the new and old concrete, the distribution of the lumps and other coarse aggregates, and the shape of the lumps. In addition, the differences in compression behavior between RLC and recycled aggregate concrete were also predicted. The numerical results indicate that the influence tendency of the spatial locations of DCLs and coarse aggregate pieces on the compressive stress–strain curves for RLC is similar to that of the locations of coarse aggregates for ordinary concrete. The strength variability of RLC is generally higher than that of ordinary concrete, regardless of the relative strength of the new and old concrete included; however, variability has no monotonic trend with an increase in the lump replacement ratio. The mechanical properties of RLC in compression are little influenced by the geometric shape of DCLs as long as the ratio of the length of their long axis to short axis is smaller than 2.0. The compressive strength and elastic modulus of RLC are always superior to those of recycled aggregate concrete designed with a conventional mixing method.

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