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Properties Of Concrete

The confused world of sulfate attack on concrete

Durability of Geopolymer Materials in Sodium and Magnesium Sulfate Solutions

Durability of concrete — Degradation phenomena involving detrimental chemical reactions

https://www.dora.lib4ri.ch/psi/islandora/object/psi%3A25804/datastream/PDF2/Lothenbach-2019-Cemdata18-%28accepted_version%29.pdf

Cemdata18: A chemical thermodynamic database for hydrated Portland cements and alkali-activated materials

This paper focuses on the experimental investigation carried out on high strength concrete reinforced with hybrid fibres (combination of hooked steel and a non-metallic fibre) up to a volume fraction of 0.5%. The mechanical properties, namely, compressive strength, split tensile strength, flexural strength and flexural toughness were studied for concrete prepared using different hybrid fibre combinations – steel–polypropylene, steel–polyester and steel–glass. The flexural properties were studied using four point bending tests on beam specimens as per Japanese Concrete Institute (JCI) recommendations. Fibre addition was seen to enhance the pre-peak as well as post-peak region of the load–deflection curve, causing an increase in flexural strength and toughness, respectively. Addition of steel fibres generally contributed towards the energy absorbing mechanism (bridging action) whereas, the non-metallic fibres resulted in delaying the formation of micro-cracks. Compared to other hybrid fibre reinforced concretes, the flexural toughness of steel–polypropylene hybrid fibre concretes was comparable to steel fibre concrete. Increased fibre availability in the hybrid fibre systems (due to the lower densities of non-metallic fibres), in addition to the ability of non-metallic fibres to bridge smaller micro cracks, are suggested as the reasons for the enhancement in mechanical properties.

Mechanical properties of high strength concrete reinforced with metallic and non-metallic fibres

Mechanism of sulfate attack: A fresh look: Part 1: Summary of experimental results

Sulfate attack research — whither now?

Mechanism of sulfate attack: a fresh look. part 2: proposed mechanisms

This paper presents an experimental study on the durability properties of self compacting concretes (SCCs) with high volume replacements of fly ash. Eight fly ash self compacting concretes of various strength grades were designed at desired fly ash percentages of 0, 10, 30, 50, 70 and 85%, in comparison with five different mixtures of normal vibrated concretes (NCs) at equivalent strength grades. The durability properties were studied through the measurement of permeable voids, water absorption, acid attack and chloride permeation. The results indicated that the SCCs showed higher permeable voids and water absorption than the vibrated normal concretes of the same strength grades. However, in acid attack and chloride diffusion studies the high volume fly ash SCCs had significantly lower weight losses and chloride ion diffusion.

Manu Santhanam

Papers

Mechanical properties of high strength concrete reinforced with metallic and non-metallic fibres

Mechanism of sulfate attack: A fresh look: Part 1: Summary of experimental results

Sulfate attack research — whither now?

Mechanism of sulfate attack: a fresh look. part 2: proposed mechanisms

Durability properties of high volume fly ash self compacting concretes