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These include assessment of frost heave A cylinder of rock aggregate 150 mm high and 100 mm in diameter is placed in freezing conditions with its base in flowing water for 250 hours The expansion or heave suffered by the specimen must be less than 12 mm 2 Quality of Aggregates Tests on Rock Aggregates
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The gradation of the coarse aggregates used in concrete pavement and concrete base shall meet the requirements for 375 mm and 19 mm aggregate shown in Table 4 Aggregates shall be stockpiled as individual size fractions and blended in the mix so as to meet the combined gradation requirements shown in Table 43267
a It should have minimum fine particles smaller than 025 mm in size cement fine aggre173gate approximately 400 kgm 3 of concrete for the max size of 32 mm of coarse aggregate In case of very angular and flaky aggregate the quantity of fine aggregate may be increased by 103730
Fine aggregate should fall within gradation limits provided in ASTM C 33 Section 6 If there is a deficiency in a locally available fine aggregate concrete may benefit from the addition of air entrainment additional cement or a supplemental cementitious material SCM to address these shortcomings3914
Unitweight measures the volume that graded aggregate and the voids between them will occupy in concrete The void content between particles affects the amount of cement paste required for the mix Angular aggregates increase the void content Larger sizes of wellgraded aggregate and improved grading decrease the void content3109
May 17 2017018332 Aggregate CementSandAggregate x 157 Density of aggregate may go higher if void spaces decreases 5mm aggregate has more density when compared with 20mm size of aggregate Hence We require 1326Kg of 20mm aggregate for 1m 3 of Concrete Amount of Water Required for 1m 3 of ConcreteFor making concrete required amount of water is added4971
Aug 18 2020018332Fine aggregate shall be tested in accordance with AASHTO T 84 1005423 Specific Gravity of Lightweight Aggregate Apparatus a Vacuum System A system capable of maintaining a vacuum of 16 mm or more of mercury in a chamber of sufficient size to accommodate the aggregate3601
Sep 26 2017018332Fractions of granite aggregate and their applications 58 mm 811 mm and 11 16 mm Euro fractions used for production of highquality concrete and conforming to European standards HASSAN HARRAZ 2017 AGGREGATE STONES 20 21 Fractions of granite aggregate and their applications 5250 mm a large fraction of aggregates3741
Sieve sizes commonly used for concrete aggregates are detailed in Table 1 and various physical properties of normalweight aggregates with typical range values are shown in Table 2 Coarse and fine aggregates are generally sieved separately That portion of an aggregate passing the 475 mm No 43707
These include assessment of frost heave A cylinder of rock aggregate 150 mm high and 100 mm in diameter is placed in freezing conditions with its base in flowing water for 250 hours The expansion or heave suffered by the specimen must be less than 12 mm 2 Quality of Aggregates Tests on Rock Aggregates3556
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