Pervious concrete for desired porosity: Influence of w/c ratio and a rheology-modifying admixture

Costa, Fernanda Bianchi Pereira da; Haselbach, Liv; Filho, Luiz Carlos Pinto da Silva

doi:10.1016/j.conbuildmat.2020.121084

Cited by 45 publications

(34 citation statements)

References 31 publications

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“…Therefore, the water/cement ratio did not significantly affect the unit weight of the porous concrete. A similar tendency was also revealed by Costa et al [ 38 ]. In their study, the unit weight of the porous concrete was reduced by 2.5% when the water/cement ratio was increased from 0.24 to 0.32.…”

Section: Resultssupporting

confidence: 89%

A Comparative Study of the Thermal Conductivities of CBA Porous Concretes

2022

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Porous concrete has recently gained increasing attention in the construction industry. To improve the properties of porous concrete, coal bottom ash (CBA) was used as the aggregate in the concrete mixtures studied herein. Hybrid CBA aggregates, including a 20% proportion of particles with sizes of 1.2~2.5 mm and an 80% proportion of particles with sizes of 2.5~5.0 mm, were used in the mixtures. Various water/cement ratios ranging from 0.25 to 0.35 were used in the mixtures. The effects of compaction at 0.5, 1.5, and 3.0 MPa on the properties of the porous concrete were also examined. The increase in the water/cement ratio reduced the unit weight and thermal conductivity while increasing the porosity of the porous concrete. Although the compaction had a significant impact on the other properties of the porous concrete, the thermal property was not significantly influenced. By using CBA in porous concrete, the mechanical and thermal properties of the concrete were significantly improved. Finally, the relationships between the thermal conductivity and other properties of the porous concrete were investigated.

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Section: Resultssupporting

confidence: 89%

A Comparative Study of the Thermal Conductivities of CBA Porous Concretes

2022

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“…The influence of the water to cement ratio on the porosity was also proven quantitatively by the binary image of the pervious concrete surface. The low water to cement ratio presented more interconnected pores than the high one [38].…”

Section: Pervious Concrete Filtermentioning

confidence: 89%

“…The different ratio of water-cement (0.24 -0.32) in the aggregate size of 2.36 -12.5 mm was analyzed by Costa et al (2021) [38]. With admixture, the lower water to cement ratio (0.24) resulted in a higher porosity, i.e.…”

Section: Pervious Concrete Filtermentioning

confidence: 99%

Suspended solids and bacteria removal mechanisms in ceramic filter and pervious concrete filter: a review

et al. 2021

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The need for drinking water with affordable access is increasing nowadays. The poor water quality problems can be solved by several water treatment methods, i.e. ceramic filter (CF) and pervious concrete filter (PCF). Those two mentioned technologies work based on the pores that exist within the filter. This study aimed to review (1) the influence of the material composition of the CF and PCF on hydraulic characteristics (porosity, permeability, pore size, pore structure, pore connectivity/ distribution) and its removal effectiveness, and (2) the removal mechanisms of suspended solids and bacteria based on its hydraulic characteristics. The study reviewed 45 literature, including books, reports, and published articles. The type, mineral, and sources of clay and the type, shape, proportion, and size of combustible materials on CF will affect its hydraulic characteristic. The shape, size, and type of aggregate, the ratio of water to cement, and the ratio of aggregate to cement on PCF will affect its hydraulic characteristics. The removal mechanisms of suspended solids are straining on the surface and trapping on the deadlocked pores. On the other hand, the bacteria removal mechanisms strain the bacteria in the dirt layer and trap the bacteria in the pores.

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“…Yu et al [17] applied 2D and 3D computed tomography to study the pore characteristics of pervious concrete. da Costa et al [18] showed that by controlling the bulk density of the concrete mix and the compaction applied during casting, the porosity of pervious concrete can be manipulated to a certain designed value.…”

Section: Introductionmentioning

confidence: 99%

Roles of mortar volume in porosity, permeability and strength of pervious concrete

Feng²,

Xiao

et al. 2021

J Infrastruct Preserv Resil

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Pervious concrete is designed to be porous to allow permeation of water and air for combating the environmental and drainage problems arising from urbanization. However, despite extensive research, it is still not clear how best to design pervious concrete mixes to achieve good concurrent permeability-strength performance. In a previous study, the authors found that there is a necessity to distinguish between interconnected porosity and open porosity, and between unsubmerged permeability and submerged permeability. In this study, based on the thinking that fine aggregate may be added to reduce the paste volume provided the fine aggregate is fine enough to form a coherent mass with the paste, further research was conducted to develop the mortar type pervious concrete with reduced paste volume and investigate the roles of the mortar volume in porosity, permeability and strength. A new series of concrete mixes with varying mortar volume were tested and the results revealed that the interconnected porosity is the major factor determining the permeability while the open porosity and water/cement ratio are the major factors determining the strength. More importantly, the mortar volume plays a key role in each performance attribute.

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Pervious concrete for desired porosity: Influence of w/c ratio and a rheology-modifying admixture

Cited by 45 publications

References 31 publications

A Comparative Study of the Thermal Conductivities of CBA Porous Concretes

A Comparative Study of the Thermal Conductivities of CBA Porous Concretes

Suspended solids and bacteria removal mechanisms in ceramic filter and pervious concrete filter: a review

Roles of mortar volume in porosity, permeability and strength of pervious concrete

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