Impact Resistance and Strength Development of Fly Ash Based Self-compacting Concrete
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ORIGINAL PAPER
Impact Resistance and Strength Development of Fly Ash Based Self-compacting Concrete Selvaraj Kumar 1 & Palanisamy Murthi 2 & Paul Awoyera 3
&
Ravindran Gobinath 2 & Sathis kumar 4
Received: 24 September 2020 / Accepted: 12 November 2020 # Springer Nature B.V. 2020
Abstract The development of self-compacting concrete using alternative materials is expanding in recent years due to the technical and economic benefits of the mixture. This study focuses on the structural and compositional behavior of sodium hydroxide (NaOH)activated fly ash based self-compacting concrete (SCC). Fly ash was partially replaced with Ordinary Portland Cement from 0– 30%. The tests performed on concrete samples include workability, strength, microstructural, and impact resistance. The results showed that activated fly ash reduces the heat of the hydration process of the concrete mixture but enhances pozzolanic reactions, which led to increased strength properties. The addition of activated fly ash modifies the mineralogy of the concrete, as evident in strength characteristics. The best performance of the activated fly ash based SCC, in terms of strength, was found at 10–15% substitutions, which can somewhat reduce the cost of production of SCC and strength improvement advantage. Keywords Activated fly ash . pozzolan . Self-compacting concrete . Sodium hydroxide . Structural behavior
1 Introduction Among several factors, the overall performance of a concrete structure, during construction or in service, largely depends on the material composition. The raw concrete materials influence its workability, strength development, morphology, and mineralogical composition [1]. In recent years, there have been advancements in concrete technology, as numerous alternative materials are investigated continuously for possible use in concrete production. The alternative materials are mostly introduced as binders or aggregate in the cementitious matrix. Fly ash, a byproduct of coal-burning process, has application in raw or activated form as a concrete constituent [2]. Fly ash has been utilized as a partial replacement of Portland cement or as a cement admixture in concrete. With the use of fly ash, studies [3–7] have reported that pore structure, hydration,
* Paul Awoyera [email protected] 1
Research Scholar, Anna University, Chennai, India
2
S R Engineering College, Warangal, Telangana, India
3
Department of Civil Engineering, Covenant University, Ota, Nigeria
4
Jay Shriram Group of Institutions, Tirupur, Tamil Nadu, India
phase change, mineralogy, and strength properties of concrete were enhanced. The performance of fly ash in concrete depends principally on its fineness, carbon content, and reactivity [8, 9]. Other researches that focused on fly ash concrete have reported that: fly ash is suitable for reducing water absorption characteristics and corrosion risk in recycled aggregate concrete [10]; addition of fly ash to concrete promotes early strength development of the matrix [11]; and that fly ash im
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