Abstract
This paper used the absolute volume method combined with the experiment to determine the compositions of high performance fine-grained concrete (HPFC) and presented the effect of limestone fine aggregate (LFA) and pozzolan (PU) on the HPFC properties. Test results showed that by increasing the LFA and PU, the workability of the concrete mixture decreased, the maximum slump loss after 90 minutes of mixing was 37.84%, whereas the mechanical properties of HPFC increased. The fine-grained concrete mixture containing 40% PU and LFA completely replaced material for natural sand, the compressive strength of concrete at 28-day increased about 23.87% in comparison to the control mixture. By using the standard NT Build 356, the destruction time of the four specimens tested was of 45, 63, 60 and 61 days, respectively. This result is due to the presence of PU increased the volume of the C-S-H, as well as the density of concrete structure and enhanced the strength of HPFC, thus increased destruction time of specimens used for the assessment of corrosion damage of reinforced in the concrete. The results of the current study support the use of the waste limestone from the quarries as a fine aggregate of green concrete in the future.
Highlights
The natural raw materials are used in the production of heavy concrete and mortar poses the problem of acute shortage in many countries including Vietnam
Quartz sand (QS) sourced original from “Lo river” in the North of Vietnam was used as fine aggregate in concrete mixtures
From these results indicates that the ratios of limestone fine aggregate (LFA) in test mixtures increases from 0% to 100%, its workability was decreased
Summary
The results of published researches [1,2,3] indicated that many industrial, agricultural and quarry wastes were used as a substitution for these raw materials in the mixtures As it is known, in technology concrete, limestone is popularly used as coarse and fine aggregate in concrete because of its high reserve. In the studies [7, 8] were investigated the properties of concrete using crushed limestone sand replacing natural sand Both water demand and cement paste amount of the limestone fine aggregate (LFA) concrete were higher than that used in normal sand concrete. The applying the standard NT Build 356 for assessment of the degree of protection against corrosion's reinforced in the concrete specimen is investigated in this study
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