2017-10-15 brittle parts within the recycled fine aggregate are ab-sent, whereas a large volume of paste remains on the aggregate surface. Hence, it is possible to manufacture recycled aggregate and accurately determine the rela-tionship between the processor effects and the defective portions in recycled fine aggregate (Ogawa et al. 2010). More
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Jun 01, 2021 The shape of fine aggregates is largely changed from round to angular after recycling of concrete rubble. In addition, the fRCA particles have different particle size distribution and specific surface areas compared to fine natural aggregates. Chemical variations.
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Feb 07, 2014 This paper presents a review of the literature published so far on the use of fine aggregates from construction demolition waste used as a
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Nov 01, 2011 For recycled concretes, recycled fine aggregate (RFA) obtained from crushed waste concretes of different qualities, and made with granitic stone, were used by replacing different contents (0%, 20%, and 30% by volume) of natural sand. In all concretes, a water-reducing admixture was used.
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Abstract. The practical use of recycled concrete aggregate produced by crushing concrete waste reduces the consumption of natural aggregate and the amount of concrete waste that ends up in landfills. This study investigated two methods used in the production of fine recycled concrete aggregate: (1) a method that produces fine as well as coarse
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Apr 04, 2019 This approach is essential because the resources for natural aggregates are decreasing in the world. In the present study, the effects of recycled concrete aggregates as a partial replacement for fine (by 50%) and coarse aggregates (by 100%) were examined in the self-compacting concrete mixtures which contain air-entraining agents and silica fumes.
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Replacement of fine aggregate by recycled fine aggregate up to 100% but by increasing the percentage of RFA in concrete it will affect the strength of concrete due to its water absorption property in that stage nano materials are used for increasing the strength of concrete because the nano materials have the C-S-H gel property.
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The influence of recycled fine aggregates, which had been reclaimed from field-demolished concretes, on the resistance of mortar specimens to magnesium sulfate attack was investigated. Mortar specimens were prepared with recycled fine aggregates at different replacement levels (0%, 25%, 50%, 75% and 100% of natural fine aggregate by mass).
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Only up to 10 to 20 percent fine RCA is beneficial. The aggregate should be tested at several substitution rates to determine the optimal rate. Often recycled aggregate is combined with virgin aggregate when used in new concrete. An
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Dec 31, 2018 1.2 Recycled Aggregates (RA) The C and D materials were collected from various locations such as building demolition site, dumping yards, ready mix concrete plant, etc. Further, the materials were categorized into the following by conducting sieve analysis: Recycled concrete Fine Aggregates (RFA)—Cement concrete/mortar waste
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Dec 15, 2021 Aggregates in total (fine and coarse) contributes to 60–70% of concrete volume, out of which 35–45% is fine aggregate [ 1 ]. Aggregates are inextricable element of concrete and, therefore, cause prominent impact on fresh and hardened properties of concrete. Natural aggregates, gravels and sand are the largely used raw material on earth
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Abstract. The practical use of recycled concrete aggregate produced by crushing concrete waste reduces the consumption of natural aggregate and the amount of concrete waste that ends up in landfills. This study investigated two methods used in the production of fine recycled concrete aggregate: (1) a method that produces fine as well as coarse
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Apr 04, 2019 This approach is essential because the resources for natural aggregates are decreasing in the world. In the present study, the effects of recycled concrete aggregates as a partial replacement for fine (by 50%) and coarse aggregates (by 100%) were examined in the self-compacting concrete mixtures which contain air-entraining agents and silica fumes.
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Sep 01, 2021 For preparing the mortar specimens, a real recycled fine aggregate (RFA) with a size range of 0.15–5 mm was used and it was derived from a batch of designed concrete which was cast by a local concrete plant with a known mix proportion (Xuan et al., 2017).The concrete was crushed and processed to different size ranges.
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Apr 01, 2005 The properties of concrete containing fine recycled aggregate are investigated. Recycled aggregate consisted of crushed concrete (CC) or crushed brick (CB) with particles less than 5 mm in diameter. The free water/cement ratio was kept constant for all mixes. The fine aggregate in concrete was replaced with 0%, 25%, 50% and 100% CC or CB.
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Jul 19, 2021 To reduce the cost of lightweight concrete (LWC) partition panels and to address recycling concrete waste, this work utilized completely recycled fine aggregate (CRFA) to replace the natural fine aggregate and ceramsite in the preparation of LWC and LWC partition panels. To this end, an autoclave-free curing process and an air-entraining agent were used to
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Recycled concrete hollow blocks are made with recycled fine aggregates and recycled coarse aggregates, so recycled block is a kind of green environmental material and can be used for masonry structure. Shear property is one main mechanical property of recycled concrete hollow block masonry. From the shear test of masonry, the shear strength has
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The recycled fine aggregate can then be utilized to manufacture recycled fine aggregate mortar (RFAM) or recycled fine aggregate concrete (RFAC). Air entraining agent was added in RFAM to improve its mechanical performance. The influence of the dosage of the air entraining agent on both the compressive and flexural strength of the RFAM was
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Thus the concept of replacement of coarse aggregate with recycled aggregate and fine aggregate with ecosand seems to be promising. 1.1.1. Recycled Aggregate The enormous quantities of demolished concrete are available at various construction sites, which are now posing a serious problem of disposal in urban areas. This can easily be recycled as
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of the experimental results of fresh and hardened concrete properties with different replacement ratios of natural river sand by recycled fine aggregate is presented in the paper. Concrete mixes containing 25 %, 50 %, 75 %, and 100 % replacement of natural sand with the recycled fine aggregate were tested.
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Jan 30, 2013 Mirza and Saif3 have studied the effect of silica fume on recycled aggregate concrete characteristics. The percentages of recycled aggregate replacements of natural aggregate used by weight were 0, 50, and 100%, whereas the percentages of silica fume replacements of cement used by weight were 5, 10, and 15%. The results.
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Feb 07, 2014 This study investigated the properties of fine recycled aggregates (FRA), with a view to enhancing their properties for structural concrete
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2017-10-15 brittle parts within the recycled fine aggregate are ab-sent, whereas a large volume of paste remains on the aggregate surface. Hence, it is possible to manufacture recycled aggregate and accurately determine the rela-tionship between the processor effects and the defective portions in recycled fine aggregate (Ogawa et al. 2010). More
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Only up to 10 to 20 percent fine RCA is beneficial. The aggregate should be tested at several substitution rates to determine the optimal rate. Often recycled aggregate is combined with virgin aggregate when used in new concrete. An
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Dec 31, 2018 1.2 Recycled Aggregates (RA) The C and D materials were collected from various locations such as building demolition site, dumping yards, ready mix concrete plant, etc. Further, the materials were categorized into the following by conducting sieve analysis: Recycled concrete Fine Aggregates (RFA)—Cement concrete/mortar waste
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Dec 15, 2021 Aggregates in total (fine and coarse) contributes to 60–70% of concrete volume, out of which 35–45% is fine aggregate [ 1 ]. Aggregates are inextricable element of concrete and, therefore, cause prominent impact on fresh and hardened properties of concrete. Natural aggregates, gravels and sand are the largely used raw material on earth
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Jul 05, 2020 Fine recycled aggregates are produced in large quantities when crushing Construction and Demolition Waste (C&DW). Even if coarse recycled aggregates are commonly used for road foundations, fine particles are often rejected as they are considered detrimental for the long-term behaviour of foundations. Physicochemical, mineralogical and
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Abstract. The practical use of recycled concrete aggregate produced by crushing concrete waste reduces the consumption of natural aggregate and the amount of concrete waste that ends up in landfills. This study investigated two methods used in the production of fine recycled concrete aggregate: (1) a method that produces fine as well as coarse
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May 24, 2021 Performance of recycled fine-aggregate concrete using novel mix-proportioning method. J. Mater. Civ. Eng., 32 (2020), p. 04020216. View Record in Scopus Google Scholar. J. Sim, C. Park. Compressive strength and resistance to chloride ion penetration and carbonation of recycled aggregate concrete with varying amount of fly ash and fine recycled
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Apr 04, 2019 This approach is essential because the resources for natural aggregates are decreasing in the world. In the present study, the effects of recycled concrete aggregates as a partial replacement for fine (by 50%) and coarse aggregates (by 100%) were examined in the self-compacting concrete mixtures which contain air-entraining agents and silica fumes.
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Apr 01, 2005 The properties of concrete containing fine recycled aggregate are investigated. Recycled aggregate consisted of crushed concrete (CC) or crushed brick (CB) with particles less than 5 mm in diameter. The free water/cement ratio was kept constant for all mixes. The fine aggregate in concrete was replaced with 0%, 25%, 50% and 100% CC or CB.
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Jul 19, 2021 To reduce the cost of lightweight concrete (LWC) partition panels and to address recycling concrete waste, this work utilized completely recycled fine aggregate (CRFA) to replace the natural fine aggregate and ceramsite in the preparation of LWC and LWC partition panels. To this end, an autoclave-free curing process and an air-entraining agent were used to
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Thus the concept of replacement of coarse aggregate with recycled aggregate and fine aggregate with ecosand seems to be promising. 1.1.1. Recycled Aggregate The enormous quantities of demolished concrete are available at various construction sites, which are now posing a serious problem of disposal in urban areas. This can easily be recycled as
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Feb 07, 2014 This study investigated the properties of fine recycled aggregates (FRA), with a view to enhancing their properties for structural concrete
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fine crushed sand use in construction fine crushed sand use in construction It is recommended to use crushed sand It is an economic and ecological alternat
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Recycled concrete hollow blocks are made with recycled fine aggregates and recycled coarse aggregates, so recycled block is a kind of green environmental material and can be used for masonry structure. Shear property is one main mechanical property of recycled concrete hollow block masonry. From the shear test of masonry, the shear strength has
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