Discrete element modelling of the fresh state behavior of pervious concrete

Pieralisi, Ricardo; Cavalaro, Sérgio Henrique Pialarissi; Aguado, Antonio

doi:10.1016/j.cemconres.2016.09.010

Cited by 64 publications

(35 citation statements)

References 19 publications

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“…Finally, tests were conducted to evaluate the porosity, density and permeability of mixes. The materials, composition and production process applied here are based on those described by Pieralisi et al [15].…”

Section: Experimental Programmentioning

confidence: 99%

“…The method proposed by Pieralisi et al [15] was used to simulate the compaction process of pervious concrete. This method takes into account parameters related to the composition of the pervious concrete, like the aggregate grading curve, the P/A ratio and the rheology of the cement paste.…”

Section: Compaction Modelmentioning

confidence: 99%

“…The porosity is achieved by reducing the amount of fines provided by the sand, as well as by the precise control of the level of compaction applied during execution. The compaction process governs the spatial distribution and sizes of the pores [14,15], having a crucial influence in the final permeability [11,16]. Slight variations in the compaction applied may render a highly permeable PC into an almost watertight material.…”

Section: Introductionmentioning

confidence: 99%

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Advanced numerical assessment of the permeability of pervious concrete

Pieralisi

Cavalaro

Aguado

2017

Cement and Concrete Research

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The most singular characteristic of pervious concrete is its interconnected porosity that allows water to flow through at high rates. The objective of this paper is to develop and validate an advanced DEM-CFD model to assess the permeability of pervious concrete numerically, taking into account the influence of the composition and of the compaction process. An extensive experimental program with 1 aggregate grading size, 4 paste contents and 3 degrees of compaction was conducted to validate the numerical approach. Results show that the DEM-CFD model is capable of predicting the permeability depending on the variables considered here. Moreover, flow parameters derived from the numerical simulations help understand the experimental results. The study confirms that, instead of relying on trial and error experiments, it is possible to use advanced numerical models to accelerate the definition of mixes and the production process, reducing the time, efforts and costs required.Peer ReviewedPostprint (author's final draft

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Section: Experimental Programmentioning

confidence: 99%

Section: Compaction Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Advanced numerical assessment of the permeability of pervious concrete

Pieralisi

Cavalaro

Aguado

2017

Cement and Concrete Research

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“…The results showed that the accuracy of the established model was satisfied. Pieralisi et al [31] established PC discrete element constitutive law based on cementation between aggregate and cement paste. The effectiveness of the method was verified by the experiments with different aggregate types, grading curves, and aggregate-to-binder ratios.…”

Section: Introductionmentioning

confidence: 99%

Strength, Permeability, and Freeze-Thaw Durability of Pervious Concrete with Different Aggregate Sizes, Porosities, and Water-Binder Ratios

et al. 2018

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Pervious concrete (PC), as an environmental friendly material, can be very important in solving urban problems and mitigating the impact of climate change; i.e., flooding, urban heat island phenomena, and groundwater decline. The objective of this research is to evaluate the strength, permeability, and freeze-thaw durability of PC with different aggregate sizes, porosities, and water-binder ratios. The orthogonal experiment method is employed in the study and nine experiments are conducted. The compressive strength, flexural strength, permeability coefficient, porosity, density, and freeze-thaw durability of PC mixtures are tested. Range analysis and variance analysis are carried out to analyze the collected data and estimate the influence of aggregate size, porosity, and water-binder ratio on PC properties. The results indicate that porosity is the most important factor determining the properties of PC. High porosity results in better permeability, but negatively affects the mechanical strength and freeze-thaw durability. PC of 15% porosity can obtain high compressive strength in excess of 20 MPa and favorable freeze-thaw durability of 80 cycles without sacrificing excessive permeability. Aggregate size also has a significant effect on freeze-thaw durability and mechanical strength. Small aggregate size is advantageous for PC properties. PC with 4.75-9.5 mm coarse aggregate presents excellent freeze-thaw durability. The influence of the water-binder ratio on PC properties is not as significant as that of aggregate size and porosity. An optimal mix ratio is required to trade-off between permeability, mechanical strength, and freeze-thaw durability.functionally and environmentally friendly material [9]. It allows rainwater to permeate into the ground and replenish groundwater, which effectively alleviates the rapid decline of groundwater. In addition, PC pavement can solve other urban environmental problems [10][11][12]. With the development of Chinese sponge city construction, PC will be widely applied in road structure [13]. Therefore, PC is of great significance for mitigating climate change, solving urban problems, and promoting the development of human society [14][15][16].The main properties of PC are strength, permeability, and durability. A porous structure is the key feature of PC, and porosity is the most important factor influencing mechanical strength, permeability, and durability. In general, the porosity of PC mixtures is 15-30% and the corresponding permeability coefficient lies in the range of 1-15 mm/s [17,18]. Higher porosity produces higher permeability, but is disadvantageous to mechanical strength and durability. Due to the absence of fine aggregate and the existence of high porosity, the strength of PC is lower than that of traditional impervious concrete. The compressive strength of PC is 5-30 MPa and tensile strength is 1. 20]. In addition, the freeze-thaw durability of PC is a very important property, especially for PC used in seasonally frozen regions. However, the freeze-thaw durability ...

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“…On the other hand, it is important to remark that currently there is no standard to assess the permeability for PC [28]. Concerning that, two types of test are commonly used to measure the permeability coefficient: the falling head permeability test [3,8,10,11,38] and the constant head permeability test [39][40][41][42][43][44].…”

Section: Hydraulic Propertiesmentioning

confidence: 99%

Correlation between Permeability and Porosity for Pervious Concrete (PC)

Sandoval

Galobardes

Cezario

et al. 2019

DYNA

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The aim of this study was to propose a correlation for the hydraulic parameters of pervious concrete (PC). Thus, three aggregates from civil construction waste and one basalt aggregate (reference) were used to produce PC. The ratio c/a (cement: aggregate) 1:3.26 and a w/c ratio of 0.34 were used in all mixtures. Compressive and flexure tensile strength tests were performed to mechanically characterize the mixtures produced, whereas porosity and constant head permeability tests were also carried out to assess the material hydraulic properties.Firstly, the experimental results were compared with the requirements established in international guidelines (ACI 522R-10, NBR 16416(2015) and VTT-R-080225-13). The results complied with the guidelines indicating it is feasible to produce pervious concretes with the sustainable aggregates used in the study in low structural applications such as walkways. On the other hand, a correlation between permeability and porosity was proposed based on Darcy’s and Bernoulli’s laws. The proposed equation, obtained by means of a non-linear regression, is an exponential equation that characterizes the hydraulic efficiency of the internal channels of the material considering the pores interconnection. The correlation between porosity and permeability was finally validated using results from the literature showing the same trend found in laboratory, and therefore it was demonstrated that the proposed correlation in an efficient tool to predict the hydraulic efficiency of pervious concrete.

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Discrete element modelling of the fresh state behavior of pervious concrete

Cited by 64 publications

References 19 publications

Advanced numerical assessment of the permeability of pervious concrete

Advanced numerical assessment of the permeability of pervious concrete

Strength, Permeability, and Freeze-Thaw Durability of Pervious Concrete with Different Aggregate Sizes, Porosities, and Water-Binder Ratios

Correlation between Permeability and Porosity for Pervious Concrete (PC)

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