Effects of expansive additive on cement composite properties

Shrinkage is a due to chemical and physical processes in concrete. The results of these are volume changes that may cause cracking, deformation, decrease in strength and especially durability of a construction. The amount of water in concrete, the fine particles content, the dimension of constructio...

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Bibliographic Details
Published in:IOP conference series. Materials Science and Engineering 2018-07, Vol.385 (1), p.12015
Main Authors: Gregorova, V, Stefunkova, Z, Ledererova, M
Format: Article
Language:English
Subjects:
Additives
Bulk density
Cement
Composite materials
Compressive strength
Expansive cement
Gypsum
Moisture content
Mortars (material)
Shrinkage
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Summary:Shrinkage is a due to chemical and physical processes in concrete. The results of these are volume changes that may cause cracking, deformation, decrease in strength and especially durability of a construction. The amount of water in concrete, the fine particles content, the dimension of construction, the method of curing of the fresh concrete and environmental conditions (temperature, humidity) are some factors influencing the shrinkage of concrete. This article deals with reduction the shrinkage of cement composites by addition of expansive cement Denka CSA and synthetic gypsum. The additives were used at a dosage of 10% of the original weight of cement. The obtained results showed different impact of these additives to the volume changes and the compressive strength of cement composites. The Denka CSA additive had a positive effect to monitored properties of cement mortars. It caused the lowest shrinkage; slight increasing of long-term compressive strength and decreasing of bulk densities after 2, 28 and 90 days of hardening.
ISSN:1757-8981
1757-899X
DOI:10.1088/1757-899X/385/1/012015