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This research aims to validate and extend these findings, evaluating the impact of different aggregate sizes (12 mm, 20 mm, and 40 mm) on the strength of concrete with 10% and 25% laterite ...
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where l is the length, d FIER is the equivalent diameter, A is the cross-sectional area, and Ψ is the perimeter of the fiber cross-section. The aspect ratio was approximately 24 36.. The Density ...
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Alkali-silica reaction (ASR) is a deleterious reaction that occurs between alkalis from the cement and reactive minerals of the aggregate, forming a gel that swells …
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Request PDF | On Jul 1, 2023, Shaohua Li and others published Effects of amorphous silica on mechanical contribution of coarse aggregates in UHPC: From micromechanics to mesoscale fracture and ...
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The effects of reactive aggregate size and aggregate angularity on alkali–silica reaction (ASR) were studied. An all-in natural reactive aggregate was used. The coarse aggregate particles were crushed to obtain crushed fine particles. The angularity of the aggregate was determined using ASTM C1252 and EN 933-6 methods.
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The required fractions for AMBT were produced using large and small jaw crushers as well as a disk pulveriser. After crushing, RA were washed based on the Adams et al. method. In CMBT, the batch water was corrected for aggregate absorption during mixing and the alkalis were boosted until 1.5% Na 2 O eq in some mixes. After 24 h …
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Compared with compression crushing, impact crushing will create more fines within the circuit, which will cause greater wear if processing abrasive material. This is why rocks with lower silica content …
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Crystalline silica can be released into the air from cutting, grinding, drilling, crushing, sanding, or breaking apart many different materials. Silica is a well-known occupational hazard and has also been …
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The test is completed in 16 days, making it more useful for short-term screening of aggregate sources. ASTM C1567, Determining the Potential Alkali-Silica Reactivity of Combinations of Cementitious Materials and Aggregate (Accelerated Mortar-Bar Method), identifies mix designs that will mitigate the effects of reactive aggregates. Various ...
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This study proposed a novel method of crushing glass aggregates to reduce the alkali-silica reaction (ASR). Glass aggregates were crushed while immersed in different calcium bearing solutions. ASR measurement and compressive strength tests of mortars incorporating the glass aggregate were performed to investigate the feasibility of the …
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DOI: 10.1016/J.CONBUILDMAT.2015.07.089 Corpus ID: 136706714; The modification effects of a nano-silica slurry on microstructure, strength, and strain development of recycled aggregate concrete applied in an enlarged structural test
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The aim of this review was to assess the association between occupational exposure to silicon dioxide and chronic respiratory symptoms among workers in the cement manufacturing industries.
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Aggregate crushing value (%) _ 11.75: 19.41: BS 812-110 [26] Aggregate impact value (%) _ 8.15: 15.24: BS 812-112 [27] Max. aggregate size (mm) 4.75: 12.5: 12.5: ... However, filling and pozzolanic effects of silica fume particles and carbon fibers crack bridging ability caused significant rise in elastic modulus of concrete mixes. By ...
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The epidermis of sugarcane internodes is populated with silica phytoliths. This is visualized in the sectioned samples (Fig. 2).Depending on the sample tilt angle, the Si signal from phytoliths appears either at the exposed epidermal surface (Fig. 2 a, c) or in the epidermal region of the longitudinal sections (Fig. 2 b, d).In addition to the Si …
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Beside the processing behaviour of the main constituents of bauxite such as hydrated alumina and silica minerals, the Chapter covers the impact of other constituents, such as titania, iron ...
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In some aggregate, the active silica constituents react with alkalis in the cementitious materials, producing alkali-silica gel. The reaction product (gel) is …
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Enhancing effects of slag, fly ash, and silica fume on either mechanical properties or RAC durability have already been reported [13], [14], [15]. Recently, another material, nano-silica, which has been reported to have beneficial effects on natural aggregate concrete (NAC) [16], [17], [18], has caught RAC researchers' attention.
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This paper investigates the effect of the bauxite sand and coarse aggregate on the quasi-static mechanical properties and resistance against high-velocity projectile impact of cement composites with 28-day compressive strengths from 34.2 to 197.2 MPa, in comparison to that of the siliceous sand and granite coarse aggregate.
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Hence, in this context, to reduce global warming, the usage of cement can be minimized by replacing it with other materials such as fly ash, silica fume, red mud, ground granulated blast furnace slag, metakaolin, rice husk ash, corncob ash, sugarcane bagasse ash, etc. QRD is a calcium-rich waste material from the rock crushing industry that is ...
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Significance of Aggregate Crushing Value Test. The crushing value test is conducted on aggregates that are used for the construction of roads. Lower crushing value aggregates give much more durability for roads due to its lower crushed fraction under the compression load. The road is subjected to motion pressure continuously.
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The coarse RCAs with a maximum particle size of 20 mm were supplied from ResourceCo in South Australia. Fine aggregates were river sand (nonreactive) with a maximum particle size of 2 mm and multicolor crushed glass sand with a maximum particle size of 1.19 mm. Figure 1 shows the aggregates particle size distributions. The glass …
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It has been observed that age, exposure conditions, crushing and the heterogeneity source can influence the alkalis and reactive silica contents in the recycled aggregates. The use of low contents of highly …
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Present research involves determining the effects of a proposed novel nano-silica prioritized-steam-treated recycled concrete aggregate (RCA) on microstructural, mechanical, and durability aspects of concrete incorporated with waste ceramic powder (WCP). The study on novel nano-silica prioritized-steam-treated …
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It was found that 20% of cement can be replaced with waste glass of 20 μm without detrimental effects on the mechanical properties. Replacements higher than 30% can cause negative impacts as insufficient amounts of CaCO 3 remain to react with the silica from the glass, known as the dilution effect. As the fine aggregate replacement …
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Effects of steel fibre and silica fume on impact behaviour of recycled aggregate concrete Ebrahim Nazarimofrada, Faiz Uddin Ahmed Shaikhb* and Mahmoud Nilia aCivil Engineering Department, Bu-Ali ...
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This paper presents the effects of silica fume and steel fiber on the mechanical properties and impact behavior of recycled aggregate concrete containing two types of recycled coarse aggregates ...
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The term 'gentle crushing' may sounds somewhat contradictory, but compared to the raw power of impact crushing, compression crushing could be considered a much gentler method – which makes it more favourable for harder, abrasive rocks. If impact crushing is opening a walnut with a hammer, compression crushing is the nutcracker.
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19.1.1.2. Agro-wastes-based pozzolans. The cement production industry is regarded as the major source of greenhouse gas discharge (Mikulčić et al., 2016).As cement is perhaps the most environmentally unfriendly concrete component, its usage is generally minimized by partial substitution with industrial wastes like fly ash, silica fume, …
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The materials listed in Table 1 were first mixed in a mixing machine for 120 s to get a slurry with nice dispersion. The ORA was then added into the strengthening slurry, and all of the materials were mixed three times. Each mixing lasted for 3 min, and the interval between two adjacent mixings was 1 min. Afterwards, the redundant slurry was …
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In China, an estimated 23 million workers are exposed to silica dust while in India, about 10 million workers are exposed. 1 Similarly, in the United States, 2.3 million workers are estimated to be exposed to silica dust with 1.85 million of them in the construction sector. 2 Recent studies have shown increased morbidity and mortality …
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