##tihuan2##Sand and gravels, as in PC concrete, make up roughly 75 to 80% of the GP concrete mass. ... At an optimal dosage of 7%, addition resulted in an increase in compressive and bond strength. FA: Nano-silica: ... Compressive strength increases rapidly over the first 7 days and then gradually increases for the next 28 days.
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##tihuan2##Cement mortar of 1:3 mix proportion is used to cast the cubes having an area of 50 cm2 are used for the determination of compressive strength of cement as per IS: 4031-1988 (Part-6). The graded Indian Standard sand (Ennore Sand -ES) confirming to IS: 650-1991 is used for preparing the cubes.
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##tihuan2##Sand is often utilized as a fine aggregate in concrete, contributing 22 to 62% of the total mass. The quantity and features of sand in concrete have an impact on its workability, mechanical characteristics, and durability. Effective replacements are needed as natural silica sand becomes scarcer. By incorporating these by-products into …
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##tihuan2##This study explores the mechanical strength of silica sand aggregates with different particle morphologies and sizes following MICP treatment. Specifically, unconfined uniaxial compressive strength (UCS) of MICP-treated spherical, near-spherical, and angular aggregates are measured for four separate size fractions (18–25, …
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##tihuan2##They are made of a solid inorganic network having an amorphous three-dimensional structure that significantly increased silica proppant compressive strength. The resulting coated proppant materials show an excellent tolerance to high closure stresses (over 10,000 psi) while their apparent specific gravities are slightly lower than …
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##tihuan2##The maximum compressive strength value is found for the composite having a composition of 50% high-density polyethylene and 50% silica sand for …
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##tihuan2##The mechanical properties of UHPC can be enhanced by adding steel fibre at concentrations as low as 2%, while a strength of 150Mpa can be achieved after 28 …
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##tihuan2##Specifically, CS treatment has been shown to increase unconfined compressive strength with time. However, limited knowledge exists regarding the performance of CS-treated soils after 1,000 days post treatment. This paper presents UCS test data for CS-treated sand samples of varying ages (freshly made and preserved …
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##tihuan2##This can be attributed to the substitution of OS powder for silica sand in the cementitious composite, resulting in a reduction of SiO 2 content within the silica sand. As a consequence, the formation of calcium–silicate–hydrate (C-S-H) compounds in the cementitious composite was diminished, ultimately leading to a decrease in …
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##tihuan2##2-Compressive Strength of Silica Sand Concrete The compressive strength of referral concrete as well as silica sand concrete is given in table 4.2. For finding the compressive strength cube specimens were tested at 7, 28 and 56 days. It is evident from this table that strength increases with addition of silica sand up to certain replacement ...
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##tihuan2##Red silica sand was tested for compressive strength at ages 7, 14, and 28 days, and the findings were 20.73, 23.32, and 24.61 MPa, respectively. White silica sand has compressive strengths of 21.83, 24.67, and …
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##tihuan2##Oman's silica sand has similar SiO2 composition (Table 1) compared to the tested sample by NREL, which the NREL sand sample is reported with the thermophysical data as …
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##tihuan2##Table 4: Details of specimens with sea sand PERCENTAGE REPLACEMENT Table 6: Compressive strength of cube with sea sand Percentage Compressive strength of cubes in N/mm2 S. No. of sea sand 7days 14days 28days 1 0% 27.68 33.24 38.96 2 10% 27.72 35.4 40.1 3 20% 27.7 34.3 39 4 30% 25.1 32 36 OF OF SEA AGE OF SAND AS …
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##tihuan2##In this study, portland cement (PC) has been partially replaced with a Class F fly ash (FA) at level of 70 % to produce high-volume FA (HVFA) concrete (F70). F70 was modified by replacing FA at levels of 10 and 20 % with silica fume (SF) and ground granulated blast-furnace slag (GGBS) and their equally combinations. All HVFA …
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##tihuan2##Due to the impact of economic and social development on the environment, there is an increasing demand for manufactured sand to replace natural sand as fine aggregate for concrete. At the same time, …
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##tihuan2##Although elevated temperature curing can increase the compressive strength of alkali-activated mortar, its field applications are still limited. In this study, alkali-activated mortars were prepared using …
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##tihuan2##The findings revealed that at 28 days, the compressive strength of silica fume concrete exceeded that of the control concrete by 21%, highlighting the positive influence of silica fume. However, ... in …
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##tihuan2##compressive strength increased in the range of about 10 – 17 % at different water cement ratio(0.25-0.45). Khayat et al (1997) reported that at 7.5% replacement
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##tihuan2##The maximum compressive strength value is found for the composite having a composition of 50% high-density polyethylene and 50% silica sand for specimen S2 of 46.20 N/mm 2 (as given in Table 5).
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##tihuan2##The unique physical and chemical properties of silica fume enhance the compressive strength and water resistance of cement ... compressive strength ratios in SSD and the oven-dry state were measured after curing in water for 3, 7, 28, 45, and 90 days. ... Sand (kg/m3) Cement Silica fume Water (kg/m3) (%) Weight (kg/m3) (%) Weight
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##tihuan2##The results show that the recommended addition was 15% of Silica fumes for optimum compressive strength that reaches 74.8 MPa. a ... micro sand, nano silica, and nano clay in developing a nano ...
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##tihuan2##Controversy exists as to why silica fume increases the strength of concrete when it is used as a partial replacement for cement. Some evidence supports the view that the increase in strength is due to an increase in the strength of the cement paste constituent of concrete. However, contradictory evidence exists that shows no increase …
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##tihuan2##The fine aggregate used is natural sand belongs to zone II as per IS 383-1982.The coarse aggregate used is of 20 mm size. ... , pp.69–81, March 2014 DOI 10.1007/s40069-013-0051-2 ISSN 1976-0485 / eISSN 2234-1315 Effect of Silica Fume and Slag on Compressive Strength and Abrasion Resistance of HVFA Concrete Alaa M. Rashad*, …
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##tihuan2##In a groundbreaking study led by Omani scientists, the spotlight is on the Sultanate's vast potential to harness high-quality silica sand for cost-effective thermal energy storage.
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##tihuan2##Resin-coated silica proppant can be used up to about 8,000 psi closure stress, improving fracture treatment results; ceramics made of aluminosilicates ores are …
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##tihuan2##With the replacement of silica sand, combination between sand and geopolymer gel was formed, the geopolymers therefore showed compressive strength higher than 34 MPa with silica sand up to 50%.
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##tihuan2##Traditional natural river sand is used as a fine aggregate for concrete, but due to the severe environmental situation in recent years, many places have asked for a ban or restriction on the extraction of river sand. This has resulted in an increasing demand for concrete using machine-made sand instead of natural sand. The estimation and …
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##tihuan2##Various silica grain size distributions have been reported in the literature that resulted in high bulk density and products with improved physical and mechanical properties, for instance, 0.075 ...
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##tihuan2##Microbially-induced calcium carbonate precipitation (MICP) can enhance the stiffness and bulk strength of sand aggregates via calcium carbonate cementation. This study explores the mechanical …
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