Abstract
The paper describes research findings and observations concerning practical application of concretes based on gypsum-free cements. Concretes made of gypsum-free cements feature short processing time and high initial strength over 1 to 3 days. Also, the article analyzes chosen factors impacting to fresh/hardened concrete – to begin with influence of mineralogical composition of aggregates, impact of water-cement ratio to initial setting time of fresh concrete as well as impact of water-cement ratio to concrete initial strength. The paper presents confrontation of concrete strengths using standard Portland cement with the same of concrete based on gypsum-free cement. Furthermore, described is experience in applied application of concretes based on gypsum-free cements. In view of short processing time as to concretes based on gypsum-free cements i.e. 25 to 50 minutes as a rule, these concretes are optimal in particular for small volume constructions or repair works requiring putting into operation as soon as possible as from casting, e.g. cement-concrete road carpets.
KEYWORDS: concrete, sclerometer, strength, analysis.
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