The effect of the cementitious paste thickness on the performance of pervious concrete

Torres, Anthony; Hu, Jiong; Ramos, Amy

doi:10.1016/j.conbuildmat.2015.07.187

Cited by 158 publications

(74 citation statements)

References 7 publications

(5 reference statements)

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“…As a result, carbonation not only proceeds from external surfaces inward but also occurs in internal pores [3]. As such, it is assumed that the cement paste layer fully carbonates in service due to (i) the immediate diffusion of air containing CO 2 and (ii) the small average cement paste thicknesses observed in pervious concrete mixtures [10]. This assumption enables calculation of a theoretical upper bound on the CO 2 sequestration potential of each pervious concrete mixture.…”

Section: Carbonation Depthmentioning

confidence: 99%

“…Furthermore, the designed porosity of each mixture was used to predict the theoretical compressive strength and hydraulic conductivity of the mixture. By combining data from previous studies [4,10,37], an empirical correlation, relating porosity and compressive strength, was determined. Data are plotted in Figure 1, while Equation (9) describes the linear relationship.…”

Section: Carbonation Model Implementationmentioning

confidence: 99%

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On the Theoretical CO2 Sequestration Potential of Pervious Concrete

2019

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Pervious concrete, which has recently found new applications in buildings, is both energy- and carbon-intensive to manufacture. However, similar to normal concrete, some of the initial CO2 emissions associated with pervious concrete can be sequestered through a process known as carbonation. In this work, the theoretical formulation and application of a mathematical model for estimating the carbon dioxide (CO2) sequestration potential of pervious concrete is presented. Using principles of cement and carbonation chemistry, the model related mixture proportions of pervious concretes to their theoretical in situ CO2 sequestration potential. The model was subsequently employed in a screening life cycle assessment (LCA) to quantify the percentage of recoverable CO2 emissions—namely, the ratio of in situ sequesterable CO2 to initial cradle-to-gate CO2 emissions—for common pervious concrete mixtures. Results suggest that natural carbonation can recover up to 12% of initial CO2 emissions and that CO2 sequestration potential is maximized for pervious concrete mixtures with (i) lower water-to-cement ratios, (ii) higher compressive strengths, (iii) lower porosities, and (iv) lower hydraulic conductivities. However, LCA results elucidate that mixtures with maximum CO2 sequestration potential (i.e., mixtures with high cement contents and CO2 recoverability) emit more CO2 from a net-emissions perspective, despite their enhanced in situ CO2 sequestration potential.

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Section: Carbonation Depthmentioning

confidence: 99%

Section: Carbonation Model Implementationmentioning

confidence: 99%

On the Theoretical CO2 Sequestration Potential of Pervious Concrete

2019

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“…Another aspect that may have contributed to this behavior is related to the dosage method, in which a fixed volume of paste for all the concrete mixes was established, regardless of the different indices of the aggregate voids. Torres, Hu and Ramos [29] show the higher the paste volume, the greater the coating of the aggregate and, consequently, the lower the porosity and permeability. As the cement paste volume was set at 25% for all concretes, in the case of mixtures with larger aggregates, that is, with smaller specific surface area, the lower the coverage area, the greater the thickness of the cement paste surrounding the particles, causing a reduction in porosity and a subsequent apparent density increase.…”

Section: Apparent Densitymentioning

confidence: 97%

Pervious Concrete as an Alternative for Non-structural Drainage to the Amazon Region: From Properties to Applications in Watersheds

Bechara¹,

Ponte²,

Barata³

2019

JCEA

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The urbanization process of the urban centers in the Amazon occurred quickly and without planning. Belém, one of the main cities in the region, suffers from intense flooding due to urbanization growth and the disorderly occupation of floodplains. The objective was to evaluate the producing of pervious concrete that meets the mechanical and hydraulic performance criteria for permeable pavement molded on site and to simulate the replacement of the entire public walkway system of a hydrographic basin in Belém in order to verify if this measure would alter the permeability of the basin and meet minimum requirements of at least 25% permeable area. The properties of three mixtures of pervious concrete with aggregates of different grading were evaluated. The permeability and flexural strength of all blends were higher than the minimum required for use as a permeable pavement for light vehicle traffic. The simulation showed that replacement of the public walkway by permeable pavement increased the permeable area of the watershed from 19 to 23%, changing from a poor condition to an acceptable level. The results indicate the potential to improve the performance of drainage systems through the wider use of permeable pavement associated with traditional structural measures.

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“…First, the size gradation of aggregate has a large effect on the arrangement of aggregates, the arrangement of voids, and the size of the voids inside concrete [39]. The bottom ash used in this study had a denser grading than expanded shale, which allowed for better dispersion of the aggregates and for smaller sized voids.…”

Section: Effect Of Bottom Ash Aggregates On Thermal Resistancementioning

confidence: 99%