Based on the cropland soil in the typical black soil region of Northeast China, the influence of mechanical compaction on soil micro-aggregate composition and stability was studied by …
WhatsApp: +86 18221755073
2.1. Raw Materials. The cement used was Ningxia Saima Factory P.O42.5 ordinary Portland cement, and the fine aggregate was natural river sand with a fineness modulus of 2.76, water absorption of 2.67%, and bulk density and apparent density of 1490 kg/m 3 and 2660 kg/m 3, respectively.The size distribution of natural river sand is shown in Figure 1.Water …
WhatsApp: +86 18221755073
In this paper, the microaggregate effect of fly ash is studied systematically by micromechanics, the hypothesis of center particle and pore size distribution. It is pointed out …
WhatsApp: +86 18221755073
Various studies have tackled the adhesion effect at the asphalt-aggregate interface at present. Cui et al. [4] have used optoelectronic colorimetry to quantitatively measure the effect of water-thermal coupling on interface adhesion performance, and verified it using water boiling method and scanning electron microscope tests. Fu et al. [5] explored the correlation between …
WhatsApp: +86 18221755073
The performance of fly ash blended concrete is influenced by the pozzolanic and/or micro-aggregate effect of fly ash particles based on the replacement levels. Dominance of either of this effect greatly influences the mechanical and fracture properties of fly ash blended concrete. In view of this, in the present study, 0%, 20%, 30%, 35%, 40%, 50%, 60% and 70% …
WhatsApp: +86 18221755073
Downloadable! Digital technologies have the scope to engender positive effects on productivity at firm and aggregate level. However, empirical evidence and theoretical contributions are ambiguous as mixed findings and diverse explanations have been put forward. We use a rich and representative sample of Portuguese firms over the period 2014-2019 to empirically assess the …
WhatsApp: +86 18221755073
Because of mineral admixture's unique micro-aggregate effects, morphological effects and chemical effects, it can improve many properties of concrete and effectively reduce production costs, so mineral admixture play an irreplaceable role in Concrete technique.Recent, with the increasing popularity of ready-mixed concrete, fly ash, slag powder ...
WhatsApp: +86 18221755073
micro-texture were compared in order to determine which one better predicts pavement friction. The friction and texture data analyzed in this study were collected from an experiment which …
WhatsApp: +86 18221755073
Micro-mechanical analysis of 3 aggregate skeletons:(a) force-displacement response;(b) coordination number;(c) ratio of coordination number; (d)contact evolution;(e) contact distribution. ... it is proved that a suitable ratio between two continuous sieve is a must for strengthening the contact effects in aggregate skeletons. The weighted ...
WhatsApp: +86 18221755073
Although, polishing effect reduces the micro-texture of the aggregates, but the micro-texture of the sandstone aggregate was not significantly affected before and after polishing. Overall, the texture of arkose was the largest, followed by red sandstone, quartz sandstone, granite, diabase, gabbro, basalt, limestone.
WhatsApp: +86 18221755073
The tiny particles have a positive micro-aggregate filling effect, increasing the slurry compactness and ITZ, ultimately improving the concrete's compressive strength. The strength of this effect is directly proportional to the LP content. Therefore, a suitable amount of LP can also enhance the compressive strength of CA-UHPC after 28d.
WhatsApp: +86 18221755073
This phenomenon is due to the pozzolanic reaction and micro-aggregate effect of fly ash changing the microstructure of the ITZ of the sample [17]. The pozzolanic reaction refers to the reaction of calcium hydroxide (CH) that occurred from cement hydration with fly ash to produce calcium-silicate-hydrates (C-S-H). C-S-H can significantly reduce ...
WhatsApp: +86 18221755073
This study employed pozzolanic slurry containing nano-alumina (NA) to coat RBA, aiming to improve both its macro and micro properties while investigating the effects of varying NA content. Key parameters evaluated included the crushing index, water absorption, and particle breakage characteristics of the aggregates.
WhatsApp: +86 18221755073
This means that a minor part of the clay-sized building units had a stabilizing effect on larger aggregate structures. The more clay-rich particle-size distribution of the wet-sieved size fractions >250 μm compared to that of the microaggregates explains the higher mass contributions of larger soil structures in the high-clay soils (Fig. 5 a).
WhatsApp: +86 18221755073
The physical contribution of SCMs is the micro-aggregate effect, wherein the fine particles of SCMs can fill small voids, alter particle gradation, and provide nucleation sites for cement hydration, thereby promoting the cement hydration process [4]. Traditional SCMs generally originate from industrial wastes; however, the availability of solid ...
WhatsApp: +86 18221755073
At the same time, ultrafine IOT can be used as an additional binder to produce hydration products [21], have micro-aggregate filling effect and a nucleation effect [18], and also have a synergistic hydration effect with slag [27]. The details of the specific enhancement mechanism will be discussed in Section 3.7. When the replacement ratio ...
WhatsApp: +86 18221755073
The Micro Aggregate Effect Of Slag Oct 06, 2023 In general, concrete can be regarded as a continuously graded particle stacking system, where the gaps between coarse aggregates are filled with fine aggregates, the gaps between fine aggregates are filled with cement particles, and the gaps between cement particles require finer particles to fill.
WhatsApp: +86 18221755073
Many researchers devoted themselves to the application and the action mechanism of fly ash in cementing material system in the past 70 years, and the hypothesis of "fly ash effects" was put forward, including three effects of fly ash in concrete, i.e., morphological, active and micro-aggregate effects [8], [9], [10], [11].It is indicated that in the early stages, fly …
WhatsApp: +86 18221755073
The filling effect of silica fume and the micro-aggregate effect of the slag-silica fume blend efficiently reduce the porosity, resulting in a dense web-like microstructure, which explains the improved mechanical properties of LCHRAC. Data availability. Data and material will be made available on request.
WhatsApp: +86 18221755073
The remaining silica fume will play a micro-aggregate filling effect to fill the pores, and the width of the micro-cracks will be narrowed. As shown in Fig. 9 (c), the geopolymer with silica fume content of 10 % has the more sufficient geopolymerization reaction with fewer unreacted precursors, ...
WhatsApp: +86 18221755073
In an experiment investigating the effects of tropical land-cover change on soil aggregate stability and microbial communities, different soil aggregate sizes were separated using a wet-aggregate stability method (Smith et al., 2014). Aggregates were separated into the following size classes: macroaggregates (250 μm–2 mm), microaggregates ...
WhatsApp: +86 18221755073
When the volume part of micro- within macroaggregates is higher than 55%, the number of connections between solids in the macroaggregate increases 5 times per each percent of microaggregate content. ... Effect of water regime on aggregate-tensile strength, rupture energy, and friability. Soil Sci. Soc. Am. J., 66 (3) (2002), pp. 702-709, 10. ...
WhatsApp: +86 18221755073
Furthermore, the micro-aggregate effect contributes significantly to the improvement of cracking resistance [22]. The simultaneous incorporation of mineral admixture often yields advantages over singular additions in cementitious materials [23], [24], [25]. The synergistic reaction of mineral admixture can optimize the microstructure of ...
WhatsApp: +86 18221755073
Soil organic carbon is the single largest pool in the global terrestrial carbon cycle (Abdalla et al., 2018).It contains about 1500 Pg carbon, which exceeds the amount of total carbon present in vegetation and atmospheric reserves (Zhang et al., 2018).Due to its large share, even a small fluctuation in its concentration may cause a dramatic increase in atmospheric carbon …
WhatsApp: +86 18221755073
The mechanical behavior of cemented gangue backfill materials (CGBMs) is closely related to particle size distribution (PSD) of aggregates and properties of cementitious materials. Consequently, the true triaxial compression tests, CT scanning, SEM, and EDS tests were conducted on cemented gangue backfill samples (CGBSs) with various carbon nanotube …
WhatsApp: +86 18221755073
Although, polishing effect reduces the micro-texture of the aggregates, but the micro-texture of the sandstone aggregate was not significantly affected before and after polishing. Overall, the texture of arkose was the largest, followed by red sandstone, quartz sandstone, granite, diabase, gabbro, basalt, limestone.
WhatsApp: +86 18221755073
The performance of fly ash blended concrete is influenced by the pozzolanic and/or micro-aggregate effect of fly ash particles based on the replacement levels. Dominance …
WhatsApp: +86 18221755073
Effect of mechanical compaction on soil micro-aggregate composition and stability of black soil Download Article: ... The proportion of 0.002 mm micro-aggregate (clay content) had a highly significant correlation with the other micro-aggregates characteristic indices (P0.05), which suggested to be an effective parameter to reflect soil micro ...
WhatsApp: +86 18221755073
This phenomenon can be attributed to the combined effect of density difference, micro-aggregate effect, and GGBS's pozzolanic reaction. Firstly, the similar apparent density between OPC (3100 kg/m 3) and GGBS (2800 kg/m 3) ensured its limited effect on the LBD when replacing OPC with GGBS by mass.
WhatsApp: +86 18221755073
The organic C content of micro-aggregate in this study was higher than that of macro-aggregate, which was inconsistent with the findings of previous research (Guo et al., 2015; Liu et al., 2023). Compared with the organic C in macro-aggregates, the organic C in micro-aggregates is mainly combined with soil minerals, which is difficult to be ...
WhatsApp: +86 18221755073
Northern China is an important cereal production area, producing 60–80% and 35–40% of China's wheat and maize, respectively (Li et al., 2019), thus promoting SOC sequestration in this region favors ensure China's food security.Rotary tillage and deep tillage are traditional tillage practices in Northern China (Shi et al., 2016).The former is preferred (Zhai et …
WhatsApp: +86 18221755073
Therefore, the effect of micro-calcium carbonate on the hydration process, workability, mechanical properties and durability is reviewed in the following section. 3.1. ... Maslehuddin M. Effect of coarse aggregate quality on the mechanical properties of high strength concrete. Constr. Build. Mater. 2003;17:97–103. doi: 10.1016/S0950-0618(02 ...
WhatsApp: +86 18221755073
The microstructural evolution and bonding mechanisms of interfacial transition zones (ITZ) between different aggregate types (paste recycled aggregate (PRA), mortar recycled aggregate (MRA) and ...
WhatsApp: +86 18221755073
It is interesting to note that in primary succession the replacement of the microbial communities in the late substrate by the early ones from micro-aggregates had positive effects on the plants. The micro-aggregate inoculum from the early substrate promoted the growth of herbs, but the macro-aggregate inoculum increased the growth of grasses ...
WhatsApp: +86 18221755073