Rivers State Polytechnic, Bori, Nigeria ABSTRACT Fly ash, rice husk ash (RHA), gypsum, and littorina littorea (periwinkle) shell powder ... Fly ash concrete was found to have increased resistance ...
Fly ash concrete mixtures were tested for the chemical and physical sulfate attack. Concrete mixtures consisting of ratios of fly ashes, Type I cement, silica fume, and ultra-fine fly ash (UFFA) were tested. Four exposure conditions were simulated by subjecting the concrete specimens to: 1) immersion in 5% Na2SO4 solution; 2) wet-dry cycling in ...
At 8% fly ash content, maximum strength of 34.67N/mm and. minimum water demand (effective w/c of 0.46) was obtained. Fly ash was then recommended. to be used at …
Key subjects include: effects on durability, fiber reinforced concrete, fly ash, pozzolans, sulfate resistance and concrete workability. With the rapidly increasing usage of by-product additives in concrete, every designer and builder needs the answers which these volumes provide. Document Details . Publication Year: 1983.
Fly ash for use in concrete: 2015: United Kingdom: BS EN 450-1: Fly ash for concrete. Definition, specifications and conformity criteria: 2012: BS EN 450-2: Fly ash for concrete. Conformity evaluation: 2005: PD CEN/TR 15840: Evaluation of conformity of fly ash for concrete. Guidelines for the application of EN 450-2: 2009: USA: ASTM C618
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The decline of coal-fired power plants has sparked concerns about the dwindling supply of fly ash, a crucial component in producing environmentally friendly cement. ... EMT …
Title: Mechanical Properties of Fly-Ash-Based Geopolymer Concrete Author(s): E. Ivan Diaz-Loya, Erez N. Allouche, and Saiprasad Vaidya Publication: Materials Journal Volume: 108 Issue: 3 Appears on pages(s): 300-306 Keywords: alkali-activated cement; fly ash; geopolymer; mechanical characterization DOI: 10.14359/51682495 Date: 5/1/2011 Abstract: …
The fly ash concrete strength continued to notably grow for another 56 days [3]. At the conclusion of 28 days and 60 days for normal water curing, the ... Fly ash obtained from …
All normal concrete mixtures except one, which had a 90% fly ash replacement, achieved a 28-day compressive strength of at least 29 MPa. Concrete with this compressive strength has multiple applications that represent a significant portion of the concrete produced.
The sulfate resistance of concrete containing fly ash was investigated in a laboratory study in which concrete specimens were continuously soaked in a 10 percent sodium sulfate solution for 18 months. Eighteen fly ashes and two other pozzolans were used as a partial replacement for Type II portland cement in a standard 4000-psi mixture design ...
The use of fly ash in concrete in Australia dates back to the late 1950's. In many Australian states, fly ash concretes form the benchmark Normal Class Concrete types described in Australian Standards AS3600 and AS1379 and supplied to most major projects. Post-tensioned concrete is a very good and efficient construction solution for many ...
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Presents comparative data on high-volume fly ash concrete made with ASTM Type I cement, and control concrete for mass concrete applications made with ASTM Type I and a modified version of ASTM Type II cements. The concrete was supplied by a ready-mix concrete producer for casting five large rectangular monoliths, each measuring 2.5 x 4.0 x 5.0 m.
This paper gives the results of an investigation on the performance of high-volume fly ash concrete made with ASTM Class F fly ashes from three different sources. Cementitious materials contents of 300, 370, and 430 kg/m 3 were used. The percentage of fly ash used was 58 percent of the total cementitious materials content.
Title: Making Concrete "Greener" with Fly Ash Author(s): V. M. Malhotra Publication: Concrete International Volume: 21 Issue: 5 Appears on pages(s): 61-66 Keywords: cement additives; CO2 emissions; concretes; fly ash; greenhouse gas DOI: Date: 5/1/1999 Abstract: The World Earth Summits in Rio de Janeiro, Brazil, 1992, and in Kyoto, Japan in …
Systemic Response Analysis of Final Setting Time of Concrete Based on Initial Setting Time and Cement Replacement with Bagasse Ash. International Journal of Materials Lifetime. 2014; 1(1):7-12. doi: 10.12691/ijml-1-1-2. Correspondence to: C. I. Nwoye, Department of Metallurgical and Materials Engineering, Nnamdi Azikiwe University, Awka, Nigeria.
Title: Effect of Fly Ash on Deformation of Roller-Compacted Concrete Author(s): Pei-Wei Gao, Sheng-Xing Wu, Ping-Hua Lin, Zhong-Ru Wu, and Ming-Shu Tang Publication: Materials Journal Volume: 103 Issue: 5 Appears on pages(s): 336-339 Keywords: deformation; expansion; fly ash; roller-compacted concrete DOI: 10.14359/18155 Date: 9/1/2006 Abstract: …
Keywords: concrete; factors; fly ash; penetration; prediction; setting time. DOI: 10.14359/12369. Date: 11/1/2002. Abstract: A model for predicting the initial setting time of concrete with and without fly ash is presented. Based on a theoretical initial spacing between the particles of unhydrated cementitious material and the rate of growth of ...
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1,3 Department of Civil engineer ing, Nnamdi Azikiwe Univer sity, Awka Anambra State,Nigeria. ... The compressive strength of concrete made with fly ash, quarry dust and SNFC at 28days ranges from ...
When mixed with concrete, this enables fly ash to act as a supplementary cementitious material, enhancing its strength, workability, and durability. Sustainable. Fly ash also contributes to sustainability efforts, as it helps reduce the demand for traditional cement production. By incorporating fly ash into concrete mixes, the overall carbon ...
When properly propor-tioned and placed, fly ash concrete generally shows improved workability, pumpability, cohesiveness, finish, ultimate strength, and durability. It has been found that fly ash is of particular value in high-strength concrete. Its use has often been shown to improve the performance of concretes exposed to sulfate attack or to ...
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Title: Fly Ash Concrete Mix Design and the Water-Cement Ratio Law Author(s): Francis A. Oluokun Publication: Materials Journal Volume: 91 Issue: 4 Appears on pages(s): 362-371 Keywords: fly ash; mix proportioning; water-cement ratio; Materials Research DOI: 10.14359/4050 Date: 7/1/1994 Abstract: When the water-cement ratio law was proposed by …
Fly ash for concrete. Definition, specifications and conformity criteria: 2012: BS EN 450-2: Fly ash for concrete. Conformity evaluation: 2005: PD CEN/TR 15840: Evaluation of …
This investigation is a study of the effect of high temperature on the structural properties of mass concrete containing fly ash. Tests were performed on cylinders exposed for periods of over 6 months to temperatures of 70 to 450 F (21.4 to 323 C). Preliminary results of the investigation show that temperatures have minor effect on both ...
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10.3. Ready-mixed coal fly ash concrete. Ready-mixed concrete (RMC) is well known (Rahacek et al., Citation 2020). Titarmare et al. (Citation 2012) reported experimental results on the use of CFA RMC. They concluded …