Abstract
Results of experimental investigation of the properties of rapid-hardening concrete are presented. Three types of cements that can achieve 14MPa compressive strength and 2.4MPa modulus of rupture after 3h at 22°C and remain workable for 10to15min were selected based on an extensive literature review. The variables in this study were (1) cement type, (2) cement content, (3) water-cement ratio, (4) use of admixtures, and (5) temperature. The measured parameters were (1) strength gain with time, (2) slump loss with time, (3) workability, (4) plastic and drying shrinkage, and (5) relationship between compressive strength and modulus of rupture. Test results showed that for those selected cements it is possible to achieve a workable concrete having 14MPa compressive strength and 2.4MPa modulus of rupture after 3h. The strength gain in flexure was more rapid than the strength gain in compression. The concrete had good flowable characteristics with vibration, and the use of retarding admixtures increased workability time up to 25min. Plastic and drying shrinkage test results showed that rapid-hardening cement is more susceptible to plastic shrinkage than ASTM Type I cement, and care should be taken that exposed surfaces are protected by curing to avoid water loss.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
