2018.1.20 Contents of chloride, sulphate and shell in the marine aggregates can influence the properties of concrete and corresponding performance of the concrete
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2023.11.10 The durability of internally cured concrete (ICC) with silicon–aluminum based fine lightweight aggregate (FLWA) exposed to combined sulfate and
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2020.7.31 Each group consisting of four set with different ratio of sulfate (0.28% (reference SO3), 0.5%, 1% and 1.5%) by weight of fine aggregate where these ratios approximate the actual reality of...
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2022.10.3 The effect of sulfate attack (SA) on the strength of ultrahigh-performance concrete (UHPC) made with different replacements (0%, 50% and 100% by weight) of
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2015.12.31 The investigated scales of fine aggregate with sulfates contents were (0.37%, 0.5%, 1.0%, and 1.5%) which is corresponding replacement by weight of cement
Read More2021.2.22 Depending on the source of the sulfates responsible for the reaction, a distinction can be made between an external and an internal reaction. To experience
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2022.8.31 Sulfate resistance of ultra-high performance concrete with recycled fine aggregate August 2022 Authors: Binbin Zhang Yu Ma Guanji Lyu Shikang Wu Show all 7
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2021.7.26 Sulfate attack is a major cause of concrete durability deteriorations. Mass loss, strength reductions, and expansive strain of concrete specimens are generally used
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2020.10.1 The aim of the present study is to investigate the effects of recycled coarse and fine aggregates on the resistance to sulfate (SO4 2−) attack of recycled concrete
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2020.3.15 Sulfate attack on concrete is a key durability problem. Internal sulfate attack (ISA) on concrete is a reaction between sulfates present in the original mix of concrete and the calcium aluminate in
Read More2023.2.27 These two values are greater than the minimum value 94 % of the standard magnesium sulphate soundness for fine aggregate in concrete in Hong Kong [31], British [33], USA [34], and Mainland China [35], which indicate the CDG sand is suitable for use as fine aggregate in concrete. Download : Download high-res image (358KB)
Read More2021.6.1 The recycled concrete fines may contain calcium hydroxide. When the recycled concrete fines are in contact with water, the alkali content of the water may increase because of the solubility of calcium hydroxide and that newly formed by the hydration of unhydrated cement (if any) in the recycled concrete fines. 4.4.5.
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2021.7.13 In this study, fine stone powder (FSP) generated in the process for producing crushed coarse and fine aggregate was used as a partial replacement for the fine aggregate. The durability of mortars was investigated under sulfate attack in terms of compressive strength loss, change in mass, and expansion. Cement mortars were made
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2018.1.20 Current Hong Kong standard “CS3: 2013 Aggregates for Concrete” [27] still adopts the regulations in the canceled BS 882-1992 [18] about the chloride content in compound aggregates including fine and coarse aggregates, which are: 0.01% for pre-stressed concrete and steam-cured structural concrete, 0.03% for structural concrete
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2023.5.24 Also, limitations and possible challenges in applicability have been highlighted. 2. Physical and chemical properties of seawater and sea sand. Sea water has primarily chloride salts along with presence of some other ions, whereas sea sand has fine seashells along with chloride and sulfate salts [8].
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With an increase in the SO 3 content in aggregate, the concrete expansion increased, and the compressive strength decreased. However, if the SO 3 content was lower than 1.5% and 3% in fine aggregate and coarse aggregate, respectively. Although, the expansion was not obvious, and the compressive strength of samples was above the initial strength ...
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2019.4.16 Sudhir Goyal. In the present work, a geopolymer concrete composite is developed using GGBS, Fly ash and superplasticizer. Two types of samples are prepared with increasing dosage of ...
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2015.12.31 The sulfate content in fine aggregate contains sulfate higher than the acceptable limi ts in most of the fine aggregate in Middle East countries ( Al -Kadhimi and Hamid, 1983) .
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2018.12.1 The experimental test results have revealed that it is possible to obtain a normal and high strength concrete with acceptable compressive and flexural strengths values by using river sand with ...
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2009.3.19 Sand contaminated with sulphates is a local problem in the Middle East Area. It is difficult to obtain well graded sand with sulphate content within the limits specified by international standards. International standard adopt different concepts in limiting internal SO3 contents in concrete. Some standards put maximum limits for SO3 by weight of
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2023.1.5 In order to study the effect of fines content on the interface between aggregate and cement of high-strength manufactured sand concrete, six mixes with fines content of 0%, 10%, and 20% in GMS and LMS concrete were selected for 1500× magnification scanning electron microscope observation. Figure 16 is the SEM image. It
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2021.12.20 In the case of specimens with known chloride content, they had a final chloride concentration of 0%, 0.18%, 0.37%, and 0.74% with respect to the total weight of the concrete. In the case of sulphate quantification, concrete specimens had added sulphate percentages of 0%, 0.25%, 0.5%, and 1% with respect to the total weight of the concrete.
Read More2014.8.29 A high correlation was found between the adhered mortar content and sulphate content (i.e. samples with higher mortar content had higher sulphate content), ... Recycling of waste glass as a partial replacement for fine aggregate in concrete. Waste Manage, 29 (2) (2009), pp. 655-659. View PDF View article View in Scopus Google
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2005.8.31 The determination of sulfate content in concrete is carried out for damage assessment before reconstruction and during repair for quality assurance of repair works. Chemical reactions between sulfates or sulfuric acid and the cementitious material lead to destruction of the concrete structure and therefore to a decrease in strength.
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2021.2.22 Cement type Using a sulfate-resisting cement allows the use of FRA with a high sulfate content [15]. These types of cement contain less C 3 A, one of the reactants needed to form ettringite. Moreover, fewer gypsum is added to this cement type as a setting retarder, compensating for the additional sulfate source to which the mixture will be
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2021.7.26 The water demand ratio is 99% and the ignition loss is 1.64%. The fine aggregate used in this test is river sand. Mass loss. Fig. 5 illustrates the development of mass loss with sulfate attack time. ... the sulphate ion content decreases rapidly along the depth and the sulphate ion content in concrete under dry-wet cycling is obviously higher ...
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2023.3.31 In this experimental study, compressive strength and resistance to sodium sulphate attack of concrete incorporating recycled ceramic tiles (RCT) as fine aggregate were investigated.
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2016.5.1 Section snippets Materials. Natural river sand (0–4 mm) and commercial quartz sand (0.6–1.2 mm and 1.2–2.5 mm) with a specific gravity of 2.66 and 2.65, respectively were used as fine aggregates.The natural crushed gypsum with the SO 3 content of nearly 38% was used as a partial substitution of the natural river sand to raise
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