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2.5 13 C nuclear magnetic resonance (NMR) analysis spectroscopy of soil aggregates. The chemical composition of SOC in soil aggregates and bulk soil was determined by the use of 13 C CPMAS NMR spectroscopy. The pre-treatment for the samples was done by the method given by Schmidt et al. . For this, about 5-g …
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Additionally, chemical composition of the OM in the clay fraction of soils from 0–20 cm, 20–40 cm and 40–70 cm and the four density fractions from soils at 20–40 cm depth was characterized ...
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Mollisols include an abundance of soil organic carbon (SOC) which is easily influenced by fertilization management. Manure addition could enhance soil aggregate stability; however, the dominating factor affecting its stabilization remains controversial. The fertilization practices were initiated in 2012 to investigate the influences of different …
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Aggregates and soil properties. The soil aggregate distribution was dominated by small macro-aggregates, whereas a relatively low proportion of the other fractions (silt + clay, micro-aggregates ...
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The chemical composition of the aggregates is given in Table 2. The main component of the aggregates (GEGA and GAA) was SiO 2 silica, and its content was 33-63% in GEGA and 52.82% in GAA ...
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Full-text available. Dec 2022. Njtd Unilorin. This study aims to investigate the effect of aggregate size on the fire resistance of concrete. The binder for this investigation was 42.5R CEM II/A-L ...
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3.2 Evolution of the chemical composition and mineralogy of the aggregates 3.2.1 Thermogravimetric analysis (TGA) Figure 7 shows the evolution of mass loss of flints of different colors according to the temperature. These measurements were performed on about 60 mg of flint powders. The mass losses are limited to 1 %.
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The chemical composition of mollusc shells is comparable with those of natural aggregate such as limestone (Table 6). Just like most natural aggregates, the major chemical compound in mollusc shell is calcium oxide. The high calcium oxide content of seashell suggests that seashell could be an inert material in concrete similar to …
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In recent years, there has been increasing interest in daily-use chemical products providing a pleasant scent. The added fragrance molecules may induce microstructural transitions of surfactant aggregates, which further affect the physical and chemical properties of the products. Here, the effects of four types of aromatic alcohols …
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The chemical composition characteristics of aggregates include specific surface area, surface energy, and pH. Specific surface area refers to the total area possessed by a unit mass of substances and is inversely …
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Then the aggregates' composition, shape, and texture properties were evaluated using a scanning electron microscope (SEM), needle-like content, and gray-level co-occurrence matrix. Finally, the impact of temperature, asphalt type, aggregate grain size, and surface texture on the adsorption evolution was studied based on the SHRP …
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The chemical composition of pumice is mainly based on the silica content, which is effective in the classification of pumice as acidic or basic. ... Effect of mineral aggregates and chemical admixtures as internal curing agents on the mechanical properties and durability of high-performance concrete. Mater., 13 (9) (2020), p. 2090, …
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The mineral composition and microstructure of aggregate (crushed and river gravel) vitally affect the overall performance of bituminous mixes. A scanning electron microscope (SEM) has been used to evaluate surface topography and chemical composition which is presented in Figs. 4 and 5, respectively. The findings conclude …
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Thus, some types of aggregates contain minerals that chemically are reactive and can affect the final suitability of the mix. Alkali-silica reaction in concrete (see Chap. 9) is probably the most outstanding chemical reaction related to …
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Aggregate chemical composition content normalization treatment. The eight chemical compositions, namely MgO, Al 2 O 3, CaO, Fe 2 O 3, SiO 2, Na 2 O, K 2 O, and TiO 2, are arranged in the following order. Fig. 6 indicates that the aggregate content of the first five chemical components is above 95%. Therefore, selecting a combination of …
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Cacao-based agroforestry systems can sequester much soil carbon (C), but information on soil organic matter (SOM) chemical composition within aggregates still needs to be available. This study aimed to evaluate (1) the impact of forest or pasture conversion to cacao AFS by assessing the chemistry of the Cm fraction, considering this …
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Solid-state 13 C NMR spectra showed that O-alkyl C was the main chemical composition of SOC in the different elevations. Regression analysis indicated that with …
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The strength and adhesion properties are greatly influenced by mineralogical and chemical composition of aggregates. Aggregates selected for this research work were from 9 different regions based on geological classification & all of them belongs to igneous group; Granite (5), Basalt (2) and Dolerite (2). The minerals determined were quartz, k ...
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The chemical analysis showed that all the samples had acid-soluble chlorides up to 0.04 % and water-soluble sulfates up to 0.37 %. Given the acceptance criteria of NEN 12620:2002+A1:2008 [30] for recycled concrete aggregates, all investigated samples with particle range 0–4 mm, can be used in structural concrete. Mineralogical composition of ...
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Cacao agroforestry systems (AFSs) have high potential for carbon (C) accumulation in weathered soils, but the chemical characterization of C compounds remains poorly understood. This information is key to understanding soil organic matter (SOM) dynamics. Thus, the chemical composition of organic matter within density …
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The effects of aggregate mineralogical composition on moisture sensitivity of aggregate–bitumen bonds were investigated using four aggregate types (two limestone and two granite), two types of bitumen (40/60 pen and 70/100 pen) and three mechanical tests: peel test, PATTI test and pull-off test, as a function of moisture immersion time.
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The difference of chemical composition of mSOC among various treatments of macroaggregates was more obvious than that of microaggregates. ... J. et al. Effects of substitution of chemical fertilizer by Chinese milk vetch on distribution and composition of aggregates-associated organic carbon fractions in paddy soils. Plant …
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In this study, four samples of recycled aggregates from the construction and demolition waste of Mexico City were characterized in order to find innovative uses for these types of materials. Gravel and sand from a recycling plant were analyzed, as well as aggregates produced in the laboratory from demolished concrete collected from landfills. …
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The chemical composition of bio-aggregates can strongly influence their properties (compressibility, durability, chemical and/or physical interactions with mineral species etc.) and consequently those of the composite containing them (setting time, hydration mechanisms, mechanical properties, durability, etc.). Nevertheless, few studies …
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Peide et al. also used XRF to detect the chemical composition of basalt and steel slag aggregate. It can ... A methodology for producing high-quality recycled aggregate using mechanical, chemical, and thermal procedures has been developed to encourage the usage of RCA. Following a discussion of the technology, a future scenario …
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Sustainability 2021, 13, x FOR PEER REVIEW 4 of 20 chemical composition of the aggregates is presented in Table 4. The data have been taken from a paper published by one of the authors [30 ...
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DOI: 10.1016/J.CONBUILDMAT.2017.04.061 Corpus ID: 136315812; Effect of chemical composition of aggregate on interfacial adhesion property between aggregate and asphalt @article{Yanping2017EffectOC, title={Effect of chemical composition of aggregate on interfacial adhesion property between aggregate and asphalt}, …
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First, chemical compositions of aggregates are determined from chemical analysis by X-ray fluorescence method. Then, exact mineral compositions of aggregates are determined from the chemical compositions by using computerized CIPW norms [16]. The CIPW Norm is a means of converting the chemical composition of a rock to an …
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The chemical com- position and physical properties of fine aggregates are pre- sented in Table 2. The main chemical constituents of the basic-oxygen furnace slag are CaO, Fe 2 O 3 and SiO 2 . ...
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To this end, extensive research has been conducted on aggregates, the chemical composition of aggregates, gradation, surface energy, specific surface area, …
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Join for free. Download scientific diagram | Chemical composition of the gravel aggregate. from publication: A novel method for measuring surface free energy of highly wettable mineral powders ...
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B) Chemical properties of aggregate. Chemical composition of aggregates; Natural aggregates are made out of various materials like silica mineral, feldspars, micaceous mineral, carbonate minerals, sulfate mineral, iron sulfide minerals, Zeolites, Iron oxide minerals, clay minerals. See more
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Combined, these results suggest that the chemical composition of lipids (and likely also that of other soil organic matter compounds) governs interaction with their environment, such as accumulation in aggregates or association with mineral soil compartments, and thus indirectly influences their persistence in soil.
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The physical and mechanical properties of RCA are experimentally estimated and compared to those of natural coarse aggregate (NCA). A set of 72 standard concrete cubes, cylinders, and beams ...
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The impact of aggregate chemical composition on adhesion was also studied. Section snippets Materials. In this study, 60/80 penetration grade asphalt obtained from SK petrochemical (Korea) was used. The physical properties of the asphalt binder are listed in Table 1. Two kinds of aggregate including limestone and granite were evaluated …
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Basalt, limestone, and diabase were selected, and the influence of these aggregates on the mechanical characteristics and microstructures of the interfacial zone …
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