Performance evaluation of ultra-high performance concrete designed with alccofine
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TECHNICAL PAPER
Performance evaluation of ultra‑high performance concrete designed with alccofine G. Gautham Kishore Reddy1 · P. Ramadoss1 Received: 9 May 2020 / Accepted: 19 September 2020 © Springer Nature Switzerland AG 2020
Abstract This paper presents a study on the development of ultra-high performance concrete (UHPC) by incorporating alccofine. Quartz powder and ground granulated blast furnace slag are used separately along with alccofine and silica fume to design UHPC mixtures. Coarse aggregates of 6 mm and 10 mm diameters are also introduced into UHPC in order to reduce the binder quantity. As part of the performance evaluation, mechanical strength properties of eight UHPC mixtures were investigated. The findings of the study indicate that UHPC containing alccofine produced improved mechanical performance relative to silica fume incorporated UHPC. The UHPC mixture containing alccofine and ground granulated blast furnace slag has produced cumulative values of 136.67 MPa, 15.2 MPa and 31.88 MPa for compressive strength, splitting tensile strength and flexural strength, respectively, at 28 days of normal curing. The use of coarse aggregates in UHPC culminated in a gradual decline in mechanical performance and an increase in slump values of the concrete. Mathematical modeling and statistical analysis were carried out using response surface model to predict the compressive strength values, compare them to experimental outcomes and check their validity. The results of this study indicate that UHPC developed by blending alccofine has yielded an overall better performance. Keywords Ultra-high performance concrete (UHPC) · Silica fume · Alccofine · GGBS · Statistical analysis · Response surface method
Introduction Ultra-high performance concrete is a blended composite material mainly based on cement. Since a standard definition to describe the material is not available so far it is often defined with its distinctive properties being compressive, flexure and split-tensile strengths in the excess of 120 MPa, 15 MPa and 8Mpa along with enhanced durability, very low permeability, very high energy absorption capacity and unique strain hardening behavior [1]. The ultra-high strengths are achieved by: optimization of the packing density in the matrix, a very high cement content (> 700 kg/ m3), use of ultra-fine pozzolans, low w/c ratio (≤ 0.25), high dosage of super-plasticizer (≥ 2% by weight), longer mixing * G. Gautham Kishore Reddy [email protected] P. Ramadoss [email protected] 1
Department of Civil Engineering, Pondicherry Engineering College, Puducherry, India
time and heat treatment [2]. To further increase the flexural performance, steel fibers are incorporated, and resultant material is labeled as ultra-high performance fiber reinforced concrete (UHPFRC) [3]. These outstanding features of UHPC gained applications for the material in impact, blast resistant structures and structures constructed in aggressive environments. UHPFRC’s remarkable load carrying capacity allows for a structural member’
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