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This study explored the mechanical, thermal, and tribological properties of silicone rubber (QM) / Fumed silica (FSiO2) nanocomposites. The mechanical properties of silicone rubber were increased by optimizing the silica content of the composite. The effects of applied load, temperature, and sliding speed on the tribological behavior of …
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Because it contains such a high proportion of silica, mix 5 has the weakest result for its flexural strength compared to the other mixes. Silica fume percentage between 0% and 10%, demonstrates ...
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What is silica? When you consider the many hazards workers face on a construction site, you probably wouldn't think that dust poses too much of a danger to health. Well, think again. Many workplace activities that create dust can expose workers to airborne silica. Silica is one of the most common substances on earth.
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In this study, basalt fiber (BF) and nanosilica (NS) were used to improve the mechanical properties of recycled concrete (RC), thereby promoting its utilization. The effect of BF and NS on the impact performance of RC was studied using the split Hopkinson pressure bar (SHPB) test. The internal microstructure of RC was analyzed by …
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In this work, the effects of silica fume type (Si-Ⅰ, Si-Ⅱ) and silica fume content (0%, 3%, and 5%) on the abrasion resistance and other mechanical properties of LHP cement concrete were studied using rotating jet method, and the correlation between the abrasion resistance and other mechanical properties was quantified.
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ASR is a complex mechanism that deteriorates concrete via creating volumetric expansion over time between the reactive silica in the aggregate and the …
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Aluminosilicate refractories are manufactured using refractory clays, sillimanite minerals, bauxite, and mixtures of alumina and silica sand. They will refer, somewhat arbitrarily, to common crystalline compounds with melting temperatures of at least 1500 °C [2].The major categories of traditional refractories are fire clays, high …
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DOI: 10.1016/J.CONBUILDMAT.2017.11.162 Corpus ID: 139490629; Effects of Nano-Silica and Rock Asphalt on Rheological Properties of Modified Bitumen @article{Shi2018EffectsON, title={Effects of Nano-Silica and Rock Asphalt on Rheological Properties of Modified Bitumen}, author={Xingang Shi and Liangcai Cai and Wei Xu and …
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However, the results show that the increase in the clay content up to 15% reduces the resistance to liquefaction of the sand–clay mixtures. Also, the test results indicate that the undrained shear strength at the peak and the undrained residual strength and the maximal shear strength decrease with the increase in clay content.
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The non-metallic element H, as a widely distributed impurity, exerts an extremely negative effect on the preparation of fused silica product [9,10,11]. …
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Silica fume is one of the construction materials, even though possess numerous advantages when used in concrete mixtures. Also it has disadvantages that are mentioned by numerous researchers [[33], [34], [35]].The existence of extremely sensitive amorphous silica in SF significantly affects the strength because of its reaction with CH …
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Table 10 presents a comparison of how the silica content/percent varied for area and personal samples and both categories in terms of mean, range, weight of free silica content, sum of actual weight of dust and percent of silica content observed through the pre-monsoon and post-monsoon periods. For September 2013, the total …
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To study the effects of particle crushing on the capacity of piles jacked in uniform silica sand samples, a model pile was jacked and tested in a half-cylindrical calibration chamber with ...
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toughness refers to resistance to crushing or impact. (b) Properties which relate to the ease with which water is absorbed and transmitted through rocks, such as porosity, permeability, water absorption and specific gravity. These properties enable an assess ment to be made of a rock's resistance to processes such as frost
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This investigation examines the effect of clamshell ash (CSA) and lime additives on the physico-mechanical characteristics of kaolinite clay soil stabilized at the optimum silica fume content.
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High-strength concrete. Silica fume. Mineralogy coarse aggregate. Compressive strength. Flexural strength. Splitting strength. 1. Introduction. Aggregate is …
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According to Multon [73], the expansion of the gel includes two phases namely alkali-silica gel hydration and increased volume followed by the gel diffusion in the cement paste.During the hydration of alkali-silica gel the chemical potential difference between the solution within the gel and the concrete pore solution induces higher water …
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Through 76 recent and past literatures, the influence of SiO2 nano-particles on workability and setting time of fresh mixture, compressive strength, flexural properties, fracture properties, water ...
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Figure 4 shows the two ways in which liquefaction can be defined: In terms of the pore water pressure, liquefaction is defined as the condition when the ratio of the excess pore water pressure (ru) to the initial effective confining pressure ((sigma_{c}^{prime })) is equal to 1.0 (Wang et al. 2019). …
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Thomas Stanton, an engineer with the California State Division of Highways, identified the issue. By 1940, he had completed his research showing that alkali content in cement, the amount of reactive silica in …
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In this study, the effect of adding nano-silica (NS) particles on the properties of concrete containing coal fly ash were explored, including the mechanical properties, impact resistance, chloride penetration resistance, and freezing-thawing resistance. The NS particles were added into the concrete …
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sachin b. rathod stone crusher workers of mara et al effect of duration of exposure to silica dust on lung function impairment in thwada region int j cur res rev, feb 2013 / vol 05 (04)
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An increase in both SF and RHA content and curing temperature caused generally an increase in the oven-dry densities compared to the . Conclusions. This study comparatively investigated the effect of silica fume (SF) and rice husk ash (RHA) on the high-temperature resistance of slag-based prepacked aggregated geopolymer (PAG) …
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Rock International Group of companies is led by a strong leadership of professionals with decades long experience in the Oil & Gas sector and allied industries. ... Ghala, Muscat, Sultanate of Oman. P.O. Box: 3968, …
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Silica sand processing manufacturer Silica sand is a versatile material with a wide range of applications due to its unique properties. After crushing, scrubbing, magnetic separation, and flotation, the purity of silica sand can reach 99.3% to 99.9%, which can meet the needs of industrial sand.
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Basaltic rocks are the main source of local crushed rock aggregate for concrete in their region. Basaltic rocks are also potential rocks for alkali–silica reaction (ASR). ASR is a complex mechanism …
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Silicate solutions can improve the durability of concrete conveniently and effectively. To horizontally compare the enhancement effects of different composite silicate solutions, three types of silicate surface treatment agents were prepared by using sodium silicate, potassium silicate, and lithium silicate as the main agents, along with urea, …
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The effect of silica dust on ventilatory function of Foundry workers. J Occup Health 2000;42:251-257. 14. Subhashini AS, Satchidhanandam N. Maximal expiratory flow volume curve in quarry workers. ... Antai AB, Osim EE. Symptoms and lung function values in nigerian men and women exposed to dust generated from crushing of granite rocks in …
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The reason for the better strength of HDPE concrete due to the combined effect of silica fume and fibers is an increase in the resistance of capillary and porosity problems in concrete [39]. However, a higher dosage of fiber incorporation caused difficulty in the flowability of concrete, and such type of concrete is difficult to work upon.
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