Effects of Fly Ash and Foundry Sand on Performance of Architectural Precast Concrete

Naik, Tarun R.; Kraus, Rudolph N.; Ramme, Bruce W.; Canpolat, Orhan

doi:10.1061/(asce)mt.1943-5533.0000432

Cited by 32 publications

(14 citation statements)

References 9 publications

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“…The majority of the particles are no larger than 500 µm [7,11,17], and their maximal diameter is generally less than 2 mm [10,17,18]. This fine grain size observation is consolidated by the value of the fineness modulus, which is on average 1.70 ± 0.62 for about ten spent foundry sands [10,[19][20][21][22][23][24][25][26][27] compared to a value of 2.65 ± 0.62 for the natural sands normally used in construction [19,20,[22][23][24][25]27,28]. The fines content of used foundry sands varies according to the molding and treatment process, mainly in the case of green foundry sands.…”

Section: Introductionmentioning

confidence: 94%

Comprehensive Characterization of Spent Chemical Foundry Sand for Use in Concrete

et al. 2021

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The foundry industry generates large amounts of spent foundry sands, which are stored, available for recovery in other industrial sectors but unfortunately poorly exploited. Different authors have studied the possibility of recovering them in concretes, which would also allow production of more sustainable cementitious materials. The variability of their results highlights the importance of a better understanding of the potential influential parameters of the by-products. Unfortunately, exhaustive characterizations of the materials are rarely performed, especially for chemically bound foundry sands. This article presents a case study for the recovery of a spent chemical foundry sand with an exhaustive physicochemical characterization of the by-product and an analysis of its influence on the workability and mechanical strengths of cementitious materials. The tests recommended by the European standard for aggregates for concrete confirmed the suitability of the by-product. Associated with additional chemical tests (scanning electron microscopy, X-ray fluorescence, X-ray diffraction, etc.) as well as metallic particles characterization, they highlighted possible influential parameters. The workability and mechanical resistance tests carried out on mortars and concretes confirmed the influence of the fineness of the by-product associated with other parameters. Its use at a substitution rate of 30% results in a strength class C 30/37 concrete.

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Section: Introductionmentioning

confidence: 94%

Comprehensive Characterization of Spent Chemical Foundry Sand for Use in Concrete

et al. 2021

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“…WFS'nin yüzde 5-12'sinin 0.075 mm'den küçük olması beklenebilir [4]. Parçacık şekli tipik olarak yuvarlatılmış açısaldır ve ASTM C33'e göre ince agregalar için derecelendirme gereksinimlerini karşılamamaktadır [23]. Bu nedenle, ince agreganın standart spesifikasyonlarını karşılamak için sadece kaba kumla kısmi değiştirmenin yapılması önerilmektedir [4].…”

Section: Wfs'nin Fiziksel Ve Kimyasal öZellikleri (Physical and Chemiunclassified

Endüstriyel Atık Bazlı Jeopolimer Betonda Atık Döküm Kumunun Doğal Agrega Yerine İkame Edilerek Kullanımı Üzerine Bir Kaynak Taraması

Eren

2020

Gazi Üniversitesi Fen Bilimleri Dergisi Part C: Tasarım Ve Teknoloji

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In this study, the effects of the use of waste foundry sands (WFS), which is an industrial waste type, by substituting natural fine aggregates in geopolymer concrete (GPC) were investigated Figure A. Formation scheme of geopolymer concrete Purpose: The main purpose of this study is to examine the literature studies on the basis of recycling and recovery process by reusing solid waste by-products such as WFS, fly ash, ground granulated blast furnace slag (GGBFS) in the GPC. Theory and Methods: In this study, the effects of the use of waste foundry sands (WFS), which is an industrial waste type, by substituting natural fine aggregates in geopolymer concrete (GPC) were investigated Results: As a result of the investigations, it has been determined that there are a limited number of studies in the literature on the use of WFS as a substitute for natural sand in various industrial waste-based GPCs. In these studies, it was revealed that the focus was mostly on mechanical properties and the compressive strength among mechanical properties was examined more. In addition, it was observed that different WFS optimum substitution rates were determined in determining the compressive strength of WFS substituted GPCs. It has been determined that WFS substitution decreases the overall cost, workability, water absorption, and sorptivity of GPC produced with various industrial wastes. It is reported that GPC produced with the addition of WFS has better resistance against acid and sulfate attack compared to conventional concrete. Conclusion: It is thought that a comprehensive investigation of features such as physical (freezethaw, thermal conductivity, TGA etc.), chemical (FT-IR etc.), mechanical (impact, hardness etc.), durability, microstructure and radiological, etc. of GPCs substituted with different ratios of WFS with interdisciplinary studies on subjects that have not been adequately researched in the literature will contribute to the literature in many ways. By taking advantage of the knowledge and experience obtained from the studies, it is thought that a great gain will be achieved in the direction of expanding the fields usage of WFS substituted industrial waste-based GPC, increasing its strength, reducing cost, providing a potential sustainable resource for GPC production, reducing disposal and disposal costs by evaluating wastes, protecting natural resources and minimizing the negative impact of cement that causes environmental pollution due to CO2 emission.

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“…Therefore, only partial replacement of natural sand by WFS is recommended to meet the standard specifications for fine aggregate. Table 1 shows the ranges of some physical properties of the WFS used by different authors for their research studies (1,7,9,(11)(12)(13)(14). The modulus of fineness of WFS has been found, on average, to be 1.82 compared to 2.7 which is a common value for natural sand, therefore only partial replacement with coarser sand is recommended to meet the standard specifications of fine aggregate.…”

Section: Introductionmentioning

confidence: 99%

Substitution of aggregates by waste foundry sand: effects on physical properties of mortars

2021

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The substitution of the normalized aggregate by residual foundry sand (WFS) was studied on the physical properties of mortars by means of resistance to compression and capillary absorption tests. The aggregate was replaced by WFS in its natural state (WFS), washed residual foundry sand (WFSW) and heat treated residual foundry sand (WFST). The WFS had a percentage of bentonite, which was sought to be thermally activated. It was found that the physical behavior of the mortars containing WFS and WFSW was similar to that of the control sample. The clay recovered from the sand washing was evaluated for its pozzolanic potential, it was found that, with the thermal treatment, the montmorillonite acquires pozzolanic behavior. Mortars with WFST presented a drop in compressive strength. The pozzolanic effect achieved in the clay was not reflected in the compressive strength of the mortars with WFST.

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Effects of Fly Ash and Foundry Sand on Performance of Architectural Precast Concrete

Cited by 32 publications

References 9 publications

Comprehensive Characterization of Spent Chemical Foundry Sand for Use in Concrete

Comprehensive Characterization of Spent Chemical Foundry Sand for Use in Concrete

Endüstriyel Atık Bazlı Jeopolimer Betonda Atık Döküm Kumunun Doğal Agrega Yerine İkame Edilerek Kullanımı Üzerine Bir Kaynak Taraması

Substitution of aggregates by waste foundry sand: effects on physical properties of mortars

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