Investigating intra-aggregate microstructure characteristics and influencing factors of six soil types along a climatic gradient

Peng, Jue; Wu, Xi; Ni, Shimin; Wang, Junguang; Song, Yantun; Cai, Chang

doi:10.1016/j.catena.2021.105867

Cited by 23 publications

(8 citation statements)

References 46 publications

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“…The parent material is responsible for the aggregate's physical characteristics, such as specific gravity, porosity, and chemical properties [50]. Natural high-grade aggregates should be composed of gravel or broken rocks, and they should be chemically inert, hard, robust, and clean; they should not be particularly water-absorbing, and they must be nonporous.…”

Section: Physical Testsmentioning

confidence: 99%

Resource Assessment of Limestone Based on Engineering and Petrographic Analysis

et al. 2022

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The China-Pakistan Economic Corridor (CPEC) is a massive in-progress construction project in Pakistan that connects more than 70 countries via multiple trade channels such as highways, railways, roads, and fiber optics. This project also involves the development of local infrastructure and industrial zones in Pakistan, which demands the discovery of new resources of aggregate to facilitate the construction. Therefore, physical characterization research was carried out on the Kirman hill region (Jurassic limestone), District Kurram, Pakistan, to investigate their suitability for utilization as construction materials using site investigation and laboratory studies. The results outline that all typical engineering parameters are within acceptable limits set by international standards like BS, ASTM, and AASHTO. Bituminous tests revealed that Jurassic limestone is appropriate as an aggregate for asphalt wearing coarse. Likewise, the petrographic study performed shows proper matching with engineering tests. The petrographic analysis of Jurassic limestone showed a minute amount of deleterious content; as a result, it is resistant to Alkali silica reaction (ASR) and Alkali carbonate reaction (ACR) expansions. Based on engineering and petrographic analysis, the Jurassic limestone, Kirman hill region, District Kurram, Pakistan is recommended as a potential aggregate for (i.e., base course, subbase course, cement concrete, and asphalt) and other mega and minor civil construction projects. Doi: 10.28991/CEJ-2022-08-03-02 Full Text: PDF

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Section: Physical Testsmentioning

confidence: 99%

Resource Assessment of Limestone Based on Engineering and Petrographic Analysis

et al. 2022

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“…The study of modern soils shows that an obvious increase of FeD is only seen when the MAP is higher than ~ 800 mm (Peng et al, 2022). This might be the reason why the change of FeD at the Loess Plateau does not show obvious precession cycle.…”

Section: Resultsmentioning

confidence: 99%

“…The effects of precipitation and temperature on chemical weathering rates must be considered simultaneously (White and Blum, 1995). A study of six modern soils of different parent materials along a climatic gradient located from north to south in eastern China shows a positive relationship between FeD and MAP and MAT (Peng et al, 2022). Another study reveals a weak positive correlation between FeD and MAP along a precipitation gradient in South China (Long et al, 2016).…”

Section: Resultsmentioning

confidence: 99%

Loess deposit reveals variations of 100-kyr cycle of temperature and 20-kyr cycle of precipitation at the low latitude of East Asia

Zhou

Han

et al. 2022

Preprint

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The cycle of precipitation change indicated by different proxy indicators are found to be inconsistent, which results in the “Chinese 100-kyr Problem”. The loess deposited in the past ~350 ka at the low latitude of East Asia is measured here. We find that the magnetic susceptibility varied at 100-kyr and 40-kyr cycles, can be interpreted as proxy for temperature. In contrast, the DCB-extractable iron varied at 50-kyr, 20-kyr and 10-kyr cycles, can be interpreted as proxy for precipitation. Our results indicate that the temperature and precipitation in the past ~350 ka at the low latitude of East Asia have varied at different cycles, and the change of East Asian summer monsoon indicated by the precipitation in this region is mainly forced by the insolation change due to a variation in the precession.

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“…However, an obvious increase in FeD is only observed when the MAP exceeds ~800 mm (correspondingly, the MAT is higher than ~15 °C) (Supplementary Fig. 8 ) 43 . This may explain why changes in FeD/FeT occurred on the CLP without a noticeable precession cycle.…”

Section: Discussionmentioning

confidence: 96%

Loess deposits in the low latitudes of East Asia reveal the ~20-kyr precipitation cycle

Li,

Zhou,

Han

et al. 2024

Nat Commun

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The cycle of precipitation change is key to understanding the driving mechanism of the East Asian summer monsoon (EASM). However, the dominant cycles of EASM precipitation revealed by different proxy indicators are inconsistent, leading to the “Chinese 100 kyr problem”. In this study, we examine a high-resolution, approximately 350,000-year record from a low-latitude loess profile in China. Our analyses show that variations in the ratio of dithionite−citrate−bicarbonate extractable iron to total iron are dominated by the ~20-kyr cycle, reflecting changes in precipitation. In contrast, magnetic susceptibility varies with the ~100-kyr cycle and may be mainly controlled by temperature-induced redox processes or precipitation-induced signal smoothing. Our results suggest that changes in the EASM, as indicated by precipitation in this region, are mainly forced by precession-dominated insolation variations, and that precipitation and temperature may have varied with different cycles over the past ~350,000 years.

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Investigating intra-aggregate microstructure characteristics and influencing factors of six soil types along a climatic gradient

Cited by 23 publications

References 46 publications

Resource Assessment of Limestone Based on Engineering and Petrographic Analysis

Resource Assessment of Limestone Based on Engineering and Petrographic Analysis

Loess deposit reveals variations of 100-kyr cycle of temperature and 20-kyr cycle of precipitation at the low latitude of East Asia

Loess deposits in the low latitudes of East Asia reveal the ~20-kyr precipitation cycle

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