A STUDY ON COMPRESSIVE STRENGTH CHARACTERISTICS OF CONCRETE ON DIFFERENT DATES

Abstract

This research investigation was based on the variation in the compressive strength of concrete cast on different dates. Thus, this experiment showcased the investigative results of concrete cast on different dates using different size of aggregates. This test was cured and crushed with different number of days, 7, 14, 21 and 28 days to test its compressive strength. The test was conducted under constant environmental conditions with the mix ratio 1.2.4 of cement, fineaggregate and coarse aggregate. Hand compaction was used and curing was by immersion i.e. deeping the cubes inside the curing tank and crushed after 7, 14, 21, and 28 days respectively. The variation in strength on curing age from the graph shows that there was rapid increase of strength gain for the first 7 days after which it reduced from the 14th day and then increases from 21 to 28 days. The result of analysis carried out from the crushing strength showed that concrete strength increases with curing age of 7 to 28 days. It also show that the strength of concrete increases progressively with the age of curing and there is rapid strength gain in the first 7 days of curing and concrete gains its maximum strength at 28 days of curing. In this research, different sizes of coarse aggregates ranging from 10mm, 16mm and 25mm were used to castConcrete. Compressive strength test and slump consisting for different sizes were measured. The result shows that the compressive strength of concrete made with 16mm at 28days of curing period was much higher followed by 25mm and 10mm. The factors affecting the compressive strength of concrete were also discussed, while aggregate parts were buttressed extensively. Also, particle size distribution analysis was conducted in the course of this project for propergrading and classification. The entire test was done with the British standard (BS) specifications..