Modeling the Simultaneous Effects of Particle Size and Porosity in Simulating Geo-Materials

Sun, Jichao; Huang, Yuefei

doi:10.3390/ma15041576

Cited by 28 publications

(15 citation statements)

References 43 publications

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“…For example, increasing the air voids from 4% to 7% has been shown to decrease stiffness and fatigue life by 25% and 69%, respectively [ 25 ], and the resilient modulus of warm-mix-asphalt has been shown to be lower than for hot-mix-asphalt [ 26 ]. Additionally, changing Poisson’s ratio and resilient modulus for asphalt aggregate base may have a greater effect on pavement deformation [ 27 ]. Future work is necessary to study these parameters in the context of the study herein.…”

Section: Resultsmentioning

confidence: 99%

Predicting Flexible Pavement Distress and IRI Considering Subgrade Resilient Modulus of Fine-Grained Soils Using MEPDG

Islam

Gassman

2023

Materials

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This paper highlights the subgrade resilient modulus (MR), which is recognized as an important parameter to characterize the stiffness of the subgrade soil for designing flexible pavement. In this study, 18 thin-walled Shelby tube samples of fine-grained subgrade soils were collected from two sites in South Carolina (Laurens/SC-72 and Pickens/SC-93) and tested in the laboratory using AASHTO T307-99 to obtain the MR. In addition, falling weight deflectometer (FWD) tests were performed on the same pavement sections to obtain the back-calculated MR(FWD) per the AASHTOWare 2017 back-calculation tool. A subgrade MR catalog was established and used to select hierarchical Input Level 2 for Pavement Mechanistic-Empirical design (PMED) analysis (v 2.6.1). The PMED analysis was run for 20 years. The Mechanistic-Empirical Pavement Design Guide (MEPDG) and global calibration values were used to predict asphalt concrete (AC) pavement distresses (e.g., rutting, bottom-up fatigue, top-down fatigue, and transverse cracking) and International Roughness Index (IRI) for each pavement section. The predicted values were compared to the field-measured values to determine bias and the standard error of the estimate to validate each distress prediction model for local calibration.

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Section: Resultsmentioning

confidence: 99%

Predicting Flexible Pavement Distress and IRI Considering Subgrade Resilient Modulus of Fine-Grained Soils Using MEPDG

Islam

Gassman

2023

Materials

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“…The above process was also performed for greater precision, so the organic matter on the oyster shells was removed. As shown in Figure 3 and Figure 4 , OSA obtained after grinding was classified into fractions with particle sizes of 0.6 mm or less (OSA0.6U), 0.6–1.2 mm (OSA0.6), 1.2–2.5 (OSA1.2), and 2.5–5.0 mm (OSA2.5) to examine the dependence of properties on the particle size [ 17 ]. The chemical composition of the oyster shells is listed in Table 1 .…”

Section: Experimental Planmentioning

confidence: 99%

Characteristics of Mortar Containing Oyster Shell as Fine Aggregate

Jung

Kim

2022

Materials

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In this study, oyster shells were processed and classified into sizes equal to or smaller than the fine aggregate threshold, and their engineering properties and fire-resistant performance were examined. The differences in heating weight loss of oyster shell aggregate (OSAs) with different particle sizes were examined using thermogravimetric analysis (TGA). The TGA results showed indicating that the temperature at which decarboxylation reaction started depended on the OSA particle size. The porosity of mortar specimens was analyzed using mercury intrusion porosimetry (MIP). The porosity area and porosity of the OSA-containing mortar increased with decreasing particle size. Mortar fire-resistant boards with heated for 2 h in accordance with the heating conditions of KS F 2257-1(methods of fire-resistant testing for structural element—general requirements) to measure their back-side temperature. The board made with OSA2.5 exhibited 273.2 °C, which is more than 90 °C higher than the back-side temperature of the board with OSA 0.6Under. Such difference was attributed to the greater heat transfer delay caused by higher porosity, porosity area, and specific surface area in OSAs with small particle sizes. The TGA results combined with the heating test results suggested that CO2 would be generated at different temperatures in boards containing OSAs with different particle sizes because of the differences in the endothermic reaction temperature.

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“…It is important to note that cement particles are usually considered spherical, with an equivalent diameter, while hydrated paste particles present a less circular shape. Since they are composed of different phases, hydrated paste particles are joint particles, and estimated as a rotating coordinate system or even approximately rectangular shaped [67]. For this reason, the peak associated with the hydrated phase appears at a coarser particle size.…”

Section: Particle Size Distributionmentioning

confidence: 99%

Quantification of Residual Unhydrated Cement Content in Cement Pastes as a Potential for Recovery

2022

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All types of concrete contain residual unhydrated cement. For example, unhydrated cement is present in high-strength concrete due to low water/cement ratios, as well as in old concrete due to coarser cement used in the past, and in fresh concrete waste due to the lack of curing. These residues of unhydrated cement are a waste of resources with potential for recovery and reuse. In this work, X-ray diffraction, thermogravimetric analysis, and analytical modeling were used to quantify the residual cement and the hydration degree of various cement pastes to explore their recovery potential. The study included cement pastes with water/cement ratios of 0.2–0.6 and residual unhydrated cement was found to be in the range 6–36%, indicating great potential for recovery and further use in the manufacture of new concrete.

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Modeling the Simultaneous Effects of Particle Size and Porosity in Simulating Geo-Materials

Cited by 28 publications

References 43 publications

Predicting Flexible Pavement Distress and IRI Considering Subgrade Resilient Modulus of Fine-Grained Soils Using MEPDG

Predicting Flexible Pavement Distress and IRI Considering Subgrade Resilient Modulus of Fine-Grained Soils Using MEPDG

Characteristics of Mortar Containing Oyster Shell as Fine Aggregate

Quantification of Residual Unhydrated Cement Content in Cement Pastes as a Potential for Recovery

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