Expansion and mechanical properties of reactive concrete incorporating fused silica

Fused silica was used to simulate reactive concrete in field structures. It was used as a replacement for fine aggregate at the dosage rate of 7.5% of total aggregate in the concrete. Expansion and mechanical properties of concrete mixes without and with fused silica were investigated. Incorporation of 7.5% fused silica in the concrete caused significant expansion and cracking of the specimens studies. Two high relative humidity (RH) values, 98% and 100%, were investigated to find the effect of this range of humidity on alkali aggregate reaction (AAR) and mass variation of concrete through two years of monitoring. Results showed that the RH conditions of 100% and 98% influenced the rate of expansion (being faster at 100% RH), but after two years, the magnitude of expansion was the same. The effect of reactivity of concrete on mechanical properties of concrete was also investigated after one year exposure at 98% RH. The mechanical properties of the concrete, especially compressive strength, flexural strength and modulus of elasticity, were adversely affected by AAR expansion. The decreases in the above properties at the age of one year were 74 %, 82 % and 93 %, respectively. These results indicate that the RH range of 98-100% is suitable for long term laboratory testing of concrete for AAR. More importantly, they highlight the significant damage that highly reactive aggregates can impart to the mechanical properties in concrete.

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  • Find a library where document is available. Order URL: http://worldcat.org/isbn/9781943847709
• Authors:
  • Kubat, T
  • Shayan, A
  • Al-Mahaidi, R
• Conference:
  • Concrete Institute of Australia Conference, 27th, 2015, Melbourne, Victoria, Australia
• Publication Date: 2015-9

Language

• English

Media Info

• Pagination: 94-100
• Monograph Title: Construction innovations: research into practice: Concrete 2015: 27th National Biennial Conference of the Concrete Institute of Australia in conjunction with the 69th RILEM Week: 30 August - 2 September 2015, Melbourne, Australia

Subject/Index Terms

• TRT Terms: Alkali aggregate reactions; Alkali silica reactions; Chemical reactions; Chemistry; Concrete; Expansion; Mix design; Properties of materials; Silica fume
• Uncontrolled Terms: Materials technology (asphalt/bitumen/concrete)
• ATRI Terms: Alkali aggregate reaction; Chemical reaction; Concrete; Expansion; Material properties; Mix design; Silica fume
• ITRD Terms: 4555: Material (constr)
• Subject Areas: Materials; I32: Concrete;

Filing Info

• Accession Number: 01586819
• Record Type: Publication
• Source Agency: ARRB
• ISBN: 9781943847709
• Files: ITRD, ATRI
• Created Date: Jan 14 2016 9:44AM