An experimental investigation on self-compacting alkali activated slag concrete mixes
| Autor: | Mattur C. Narasimhan, R. Manjunath |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Absorption of water
Materials science Metallurgy 0211 other engineering and technologies Modulus Slag 02 engineering and technology Building and Construction 021001 nanoscience & nanotechnology Taguchi methods Compressive strength Mechanics of Materials Ground granulated blast-furnace slag visual_art 021105 building & construction Architecture Ultimate tensile strength visual_art.visual_art_medium 0210 nano-technology Safety Risk Reliability and Quality Civil and Structural Engineering Electric arc furnace |
| Zdroj: | Journal of Building Engineering. 17:1-12 |
| ISSN: | 2352-7102 |
| Popis: | In present work, an attempt has been made to develop self-compacting, alkali activated slag concrete mixes, using steel slag sand as fine aggregate and EAF (Electric Arc Furnace) slag as coarse aggregate. The study investigates the properties such as compressive strength , splitting tensile strength and water absorption of these mixes. Development of S elf- C ompacting A lkali A ctivated S lag C oncrete mixes (hereafter referred to as SCAASC mixes) was made with GGBFS (Ground Granulated Blast Furnace Slag) as the binder, with its content varying between 700 kg/m3 and 900 kg/m3 of fresh concrete. The net W/B (water to binder) ratio of the mixes was varied between a narrow 0.47 – 0.48 range. The alkaline solutions had Na2 O percentages in the range 7 – 9%, but a constant activator modulus was maintained at 1.0 in all the mixes. In order to optimise the number of trial mixes to be tested, Taguchi's design of experiments methodology was adopted. A total of nine mixes were formulated using Taguchi orthogonal L9 array. Results showed the slump flow values for the mixes greater than 700 mm, with their L–Box ratios and V-Funnel values ranging between 0.90 and 0.95 and 9 – 11 s respectively, satisfying the EFNARC guidelines. Results also showed good compressive strengths (65–80 MPa), split-tensile strengths (2–4 MPa) and low water absorption values in the range of (2%–3%). The microstructural studies such as SEM, EDX and XRD analysis were also carried out, showing denser morphologies clearly indicating effective activation of slag by the alkaline solution. |
| Databáze: | OpenAIRE |
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