Investigation of the influence of blast-furnace slag on the resistance of concrete against organic acid or sulphate attack by means of accelerated degradation tests

Resistance of alkali-activated binders to organic acid attack: Assessment of evaluation criteria and damage mechanisms

Durability of Building Materials and Components in the Agricultural Environment, Part II: Metal Structures

Micro-organisms can have a devastating effect on building materials. They produce a range of organic and inorganic acids and enzymes, inducing solution and alteration of mineral phases. Biofilms alter the water exchange of the material and also mechanical effects add to the biodeterioration. One especially deleterious process in which bacteria are involved, is biogenic sulphuric acid corrosion in sewer systems. On the other hand, some types of bacteria can be used in engineering applications, for example for biological cleaning and bioconsolidation. Bacterially induced carbonate precipitation has been proposed as an environmentally friendly method to consolidate and protect decayed limestone or cementitious materials. The method relies on the bacterially induced formation of a compatible and highly coherent carbonate precipitate. Furthermore, the same principle can be applied for manual or autonomous remediation of cracks in concrete and the bacteria are in this case used as self healing agents.

Microorganisms versus stony materials: a love–hate relationship

The effects of replacing 10, 40 or 60% of the cement content by low-calcium fly ash on the compressive strength and durability of the concrete were investigated. An appropriate amount of (super)plasticiser was added to the mix to obtain good workability. At an early age the compressive strength decreases with increasing level of cement replacement. After 28 days the compressive strength increased relatively more for high-volume fly ash concrete than for the control concrete. Concrete with fly ash performed better in lactic/acetic and sulphuric acid during accelerated experiments. The chloride diffusion coefficients resulting from accelerated chloride migration tests were significantly lower for concrete with fly ash than for the control concrete, except for the mixture with 60% replacement of the cement content. The resistance to frost/thaw cycles was similar for all concrete mixtures. The carbonation depth after 9 weeks in a 10% carbon dioxide (CO2) environment increased with increasing fly ash content. ...

Strength and durability of high-volume fly ash concrete

Attack of Concrete Floors in Pig Houses by Feed Acids: Influence of Fly Ash Addition and Cement-bound Surface Layers

Compounds aggressive to concrete floors in pig houses

Concrete in agricultural construction is often subjected to aggressive environmental conditions. For example, spilled meal-water-mixtures and silage effluent contain lactic and acetic acids, which degrade concrete. Through accelerated laboratory tests, the resistance of different concretes to these acids was studied.

Concrete attack by feed acids: acclerated tests to compare different concrete compositions and technologies

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Attack of Concrete Floors in Pig Houses by Feed Acids: Influence of Fly Ash Addition and Cement-bound Surface Layers

Compounds aggressive to concrete floors in pig houses

Concrete attack by feed acids: acclerated tests to compare different concrete compositions and technologies