ConstructionMaterials for Civil Engineers
Theexperiment dealt with coming up with a mix design for high strengthconcrete. In doing so, the experiment determined the most suitableconcrete mixes in order to achieve maximum strength with minimumeconomic expenditures. In order to determine the best results forrelative quantities and proportions, the lab focused on the locallyavailable constituents of concrete. The students began by choosingthe concrete slump and then did a number of mixes and laterconstructed graphs. Although it is expected that the course aggregateinformation be that: air content (1%), BSDssd (2.68%), and themoisture content (2%) (Bossink 59). After carrying out theexperiment, it was found that the fine aggregate information was aircontent (.53%), the BSDssd (2.59%), and the moisture content (8.1%).
Uponcompleting the course aggregate information, the next lab focused onmixing the cement, the first mix was extremely dry which the studentsthought was due to the miscalculation of water during the first labbut was actually due to the weather in which the students weremixing. The professor added a chemical that would allow the mix tobe more workable and the slump was satisfied. Concrete was placed inthe molds to allow them to set for some time period. The cylinders ofconcrete were then cured for about one to two weeks. The molds werebroken, data taken and graph plotted. While breaking the first twomolds, 81,198 and 81,969 lbs of force was applied. On carrying thesecond test, very odd results were found and the recordings were79,635 and 83,175 lbs of force. Although there was disparity in theresults got, the experiment came to a conclusion that the compressivestrength depends on mix ratio, size and texture of aggregates andmethod of compaction.
Bossink,B. A. G., and H. J. H. Brouwers. "Construction waste:quantification and source evaluation." Journal of constructionengineering and management 122.1 (1996): 55-60.