Abstract:Pervious concrete may be used for stormwater management since it allows the water to pass through its interconnected macropores into stormwater systems or soils below. However, there is a need for additional standards related to pervious concrete prior to its widespread use, and there are many aspects related to mix design for desired properties, compaction methods, and test procedures that are not yet completely understood. These variables may significantly affect the functional and mechanical performance of … Show more
“…Results indicated that compressive strength increased with fresh density, whereas porosity decreased simultaneously, whatever the number of compaction layers or blow pattern. Both parameters exhibited a clear linear dependence on fresh density, as pointed out in the literature (40,41). With the increase in A/C ratio, compressive strength and fresh density reduced for all mixes.…”
An experimental study was conducted to evaluate the effect of compaction layer configuration, effort, and blow pattern on compressive strength and porosity characteristics of pervious concrete. Distinct types of compactions were applied to pervious concrete mixes with aggregate-to-cement (A/C) ratios ranging from 2.5 to 7.0. The results obtained from the experimental study revealed that three-layer compaction improved compressive resistance significantly compared with single-layer. In contrast, reduction in porosity was observed in three-layer compaction. Overall, by optimizing compaction effort and A/C ratio in three-layer compaction, compressive strength and porosity could be improved to be in the ranges 20.0 MPa to 30.0 MPa and 15% to 35%, respectively. In the three-layer compaction configuration, blow patterns have been identified to influence compressive strength and porosity. Findings of the study recommend deploying an A/C ratio between 3.5 and 4.5 with three-layer compaction to cast pervious concrete that would produce elements with compressive strength and porosity ranging from 10.0 MPa to 25.0 MPa and from 11% to 30%, respectively.
“…Results indicated that compressive strength increased with fresh density, whereas porosity decreased simultaneously, whatever the number of compaction layers or blow pattern. Both parameters exhibited a clear linear dependence on fresh density, as pointed out in the literature (40,41). With the increase in A/C ratio, compressive strength and fresh density reduced for all mixes.…”
An experimental study was conducted to evaluate the effect of compaction layer configuration, effort, and blow pattern on compressive strength and porosity characteristics of pervious concrete. Distinct types of compactions were applied to pervious concrete mixes with aggregate-to-cement (A/C) ratios ranging from 2.5 to 7.0. The results obtained from the experimental study revealed that three-layer compaction improved compressive resistance significantly compared with single-layer. In contrast, reduction in porosity was observed in three-layer compaction. Overall, by optimizing compaction effort and A/C ratio in three-layer compaction, compressive strength and porosity could be improved to be in the ranges 20.0 MPa to 30.0 MPa and 15% to 35%, respectively. In the three-layer compaction configuration, blow patterns have been identified to influence compressive strength and porosity. Findings of the study recommend deploying an A/C ratio between 3.5 and 4.5 with three-layer compaction to cast pervious concrete that would produce elements with compressive strength and porosity ranging from 10.0 MPa to 25.0 MPa and from 11% to 30%, respectively.
“…However, for some researchers [12,[15][16][17][18][19], the permeability test may be performed with constant-head permeameter for specimens with high porosity and high permeability. On the other hand, other authors [20][21][22][23] perform the test using falling-head permeameter, regardless of the porosity level of the specimens. In this sense, mix design philosophies of pervious concrete are limited.…”
This study aims to investigate the properties of pervious concrete focusing on characterization tests by the Ultrasound Method. For this, three mixtures were produced with the paste/aggregate (P/Ag) ratio ranging from 0.45 to 0.65, water to cement ratio (w/c) of 0.3, and all the specimens were compacted with a steel rod. The application of the ultrasound method deserves special attention for the characterization of pervious concrete, due to a lack of research and the potential to develop analytical models for predicting properties from ultrasonic pulse velocity (UPV) as an independent variable. The UPV obtained in this study ranged from 3642 to 4262 m/s for an approximately 12% reduction in porosity, with a correlation (R²) of 0.91. It is noteworthy that the high porosity of pervious concrete causes attenuation of the ultrasonic wave. The measurements of UPV had higher values for specimens with higher densities (R²=0.87), higher compressive and tensile strengths (R² of 0.79 and 0.84, resp.), and lower permeability (R² = 0.91).
“…Connectivity of pores can be negatively affected by the compaction method and energy due to its effect in the orientation and packing of ingredients and, hence, restriction of compaction is essential [29]. Impulsive compaction methods such as proctor hammer [17,28,[67][68][69] or Marshall hammer [41,66] are quite often used to compact porous concrete specimens for testing purposes. In the case of pavement application, pervious concrete is compacted using hand steel rollers with low compaction energy [66].…”
Section: Methods Of Compaction and Compaction Energymentioning
Pervious concrete is an environment friendly solution for eliminating imperviousness-related drawbacks of conventional concrete. Pervious concrete mixes are predominantly composed of cement, coarse aggregate, and water. The partial or complete elimination of fine aggregate results in porous structure, which influences performance of pervious concrete. This article is aimed at reviewing major factors involved in the design of pervious concrete mixes, namely the compaction, aggregate to cementitious material ratio (ACR), sand fraction, water to cementitious material ratio (w/cm), size of coarse aggregate, and void ratio or porosity. The effects of various admixtures, replacement materials, and fibres, are also discussed. The results indicate that pervious concrete acts as an effective medium in promoting the sustainability of urban environments due to its multi-aspectual benefits.
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