Variation of Compressive Strength of High Performance Strength Concrete (HPC)
Mentor:Pratanu Ghosh, Associate Professor, California State University Fullerton
Author: Geovani Luna, California State University Fullerton Faculty Advisor: Dr.Pratanu Ghosh, Civil and Environmental Engineering, California State University Fullerton. Abstract Long term chemical attacks due to chloride induced corrosion is one of the major problems that affect concrete structures, specially bridge decks and pavements. Thus, it is important to obtain High Performance Concrete (HPC) mixtures that contain different supplementary cementitious materials (SCM) to minimize its wear, and achieve long term strength as well as prolonging service life when it is use in concrete structures. This research seeks to find the performance and strength durability of HPC when SCM are used, and compare it with the control mixture of 100% ordinary Portland cement (OPC). The research seeks to investigate more than thirty mixtures, which include silica fume, fly ash, slag and metakaolin, as different SCMs for all the mixtures while keeping the water to cement ration constant to 0.4. All concrete mixtures were prepared and cured according to ASTM C192 specifications. Once the concrete mixture were cast it was then put in a 4”x 8” cylinder container mold for curing, subsequently two cylinders were tested on day 1,3,7,14,28, and 56 in order to determine the strength of the concrete mixture and how it would change with time. Results, shows that HPC mixtures performed better compared to the control and permeable mixture in terms of strength at later ages. Thus, it indicates that SMCs provide their pozzolanic effects at later age. Therefore, finding the right HPC mixture for any environment is critical to create nationwide performance base specification for concrete mixtures regardless of the region in which it would be used.