Effects of curing, compaction, tempetures and rainfall on compressive strength of concrete

This paper is obtained and scrutinized the outcomes of so-called or ignored cure,compression, temperature and precipitation circumstances on compressive strength ofconcrete and also its effect on the unit mass of concrete in the official concrete qualitycontrol laboratory.Generally in the conditions of the country; accordance with the standards, samplesof cube concrete with the size of 15x15x15 have been taken from the concrete mixer andmalled or pricked 25 times before they have been stored in the protected area of theconstruction site about a day. At the end of the first day, depending on the weatherconditions, these samples have been brought to the contruction materials laboratory fortwenty-five days and placed in the water with avarege 18-22 degrees. At the end of the28th day, the results of the compressive strength of concrete have been examined.In this officially recorded study result, it is supposed that the environment of sitecure, the effects of concrete mixing & compaction, the weather temparture and thecondition of precipitation are obtained and evaluated in accordance with the standards.There are four test sequences with different conditions are prepared for the aim ofunderstanding the degree of the accurancy.It is monitered and calculated the effects of precipitation & temperature on thesamples that under condition of cure & compression and the samples that are not undercondition of cure & compression, also compressive strength and the result of unit mass.Based on these results; it is approximately calculated the effects of compression,mixing, temperature, precipitation and cure on the sample of different concrete strenghtand on the result of unit mass. It is set up a link between unit mass of concrete andcompressive strenght. And finally it is indicated the importance, the necessity, theefficiency of uniquness & togetherness of effects that have impact on compressive strengthand unit weight factors.At the end of the study; when we scrutinize -in general- the effect of weathercondition and sample temperature on the compressive strenght of concrete; it is observedthat there is a modest strength decrease or increase on the samples of concrete whichapplied cure, but not compression. It is also observed the effects of the sampletemperatures on the compressive strenght. If the twenty-eight days average temperatureincreases, the strength loss of the concrete increase. And if the twenty-eight days avaragerainfall increase, the strenght loss of the concrete decrease. However, it is observed thattotal of two-days rain has a significant effect on the compresive strenght of all samples.As we examined -in general- the effects of the wether conditions and sampetemprature over the unit mass of concrete; if two-days total rainfall increases, the loss ofunit mass decreases. While taking samples the weather temperature increased, the loss ofunit mass usually decreased. Two and twenty-eight days rainfall have caused a slightdecrease in volume loss. It is not clearly observed that the weather condition and sampletemperature has a significant effect on the sample concrete which is not applied cure andcompression.Although there is no certain link between compressive strenght of concrete and unitmass, the samples which faced more loss of concrete pressure usually have more loss ofunit mass.The ratio of the compressive strenght of standard seven-days samples tocompresive strenght of twenty-eight-days saples is between 0,73 to 0,87. Also averageratio is 0,81. Concrete samples have reached 81 percent of resistance in the seventh daythat was supposed to reach in twentyeighth day.Monitered samples which tightened but not cured have % 18,65 loss of resistancecompared to the standard sample. The samples which cured, but not tightened have %15,09 loss of resistance compared to standard sample. And finally the samples which nottightened and also not cured have % 25,16 loss of resistance when it?s compared to thestandard sample .The concrete which not applied curing and also not applied tightening have exposedto -approximately- an avarege of % 25 loss of resistance. Thus, this concrete has shown thefeatures of the two sub-characteristic concrete. The concrete which applied one of the(curing or tightening) factors but not the other one has shown the features of the one subcharacteristicconcrete.Key Words: Compaction, Compressive Strength, Cure Condition, Rainfall, Tempeture,Unit Weight