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1) To determine the aggregate crushing value of coarse aggregates 2) To assess suitability of aggregates for use in different types of road pavement 2 PRINCIPLE The aggregate crushing value gives a relative measure of the resistance of an aggregate to crushing under a gradually applied compressive load Crushing value is a
Objective 1 Determine the aggregate crushing value of coarse aggregate 2 Assess suitability of coarse aggregates for use in different types of road Theory The “aggregate crushing value” give a relative measure of the resistance of an aggregate to crushing underThe aggregate crushing value (ACV) provides relative measure of the resistance of an aggregate to crushing under a gradually applied compressive load Two versions available 150 (standard) and 75 mm dia The apparatus comprehend cylinder plunger base plate tamping rod and measure Cylinder plunger and base plate are made from special alloy
Get QuoteTherefore aggregate used for such propose should have sufficient toughness to resist their disintegration due to the impact This important property of aggregate is determined by the aggregate impact value test This resistance of aggregate may differ from resistance to gradual load which we measure in the crushing value testAn aggregate to crushing under the applied compressive load In other word is a value which indicates the ability of an aggregate to resist crushing It is used to determine the crushing value of a given road aggregate also it is used to assess the suitability of aggregate for use in different road pavement
Get Quote“Aggregate Crushing values is a relative resistance of aggregates to crushing under gradually applied compressive load” In situations when aggregate value 30 or higher the result may be a mistake and in such cases the “ten percent fines value” should be determined and used insteadSignificance of Aggregate Crushing Value Test The crushing value test is conducted on aggregates that are used for the construction of roads Lower crushing value aggregates give much durability for roads due to its lower crushed fraction under the compression load The road is subjected to motion pressure continuously
Get QuoteOf the recycled asphalt about two thirds is used as recycled aggregate for road base with the remaining one third used to produce new asphalt hot mixes Using recycled aggregate earns credits for the LEED Green Building Rating System3 The table below shows limits of aggregate crushing value for different types of road construction Types of Roads Pavements Aggregate Crushing Value Limit Flexible Pavements Soling 50 Water bound macadam 40 Bituminous macadam 40 Bituminous surface dressing or thin premix carpet 30 Dense mix carpet 30 have a higher strength
Get QuoteCrushing resistance of coarse aggregate is the key to the stability and durability of the skeleton structure of permeable asphalt (PA) mixture To determine the technical requirements of crushing value of coarse aggregate used in PA mixture step loading compression tests were conducted on the mixtures of PA 13 and a control asphalt mixture AC 13 respectivelyAggregate (RAP) Limiting Value Los Angeles Abrasion Value(GradeA) Percent 19 25 5 ≤ 40 Aggregate Impact Value Percent 8 15 96 ≤ 40 Aggregate Crushing Value Percent Table 18 21 ≤ 35 2 1 SIEVE Of Mass ANALYSIS Sieve Analysis is a method of determining the particle
Get QuoteAggregate Crushing Value (ACV) and Ten Percent Fines Value (TFV) These tests are a measure of the crushing properties of aggregate and use the same basic equipment The ACV test requires a standard load of 400 kN to be applied over a period of 10 minutes while the TFV test measures the force required to produce a specified depth of plungerThe average values of 18 88 and 30 69 obtained for the aggregate impact value (AIV) and aggregate crushing value (ACV) were satisfactory for road surfacing when compared with the specification Marshall stability values of 10 84 KN 4 27 KN and 3 21 KN respectively were obtained with 30 20 and 50 partial replacements with AS
Get QuoteProcedure of Aggregate Impact value test The test sample normally aggregates sized 10 0 mm to 12 5 mm the aggregates should be dried by heating at 100 110 0C for a period of 4 hours and cooledTo determine the technical requirements of crushing value of coarse aggregate used in PA mixture step loading compression tests were conducted on the mixtures of PA 13 and a control asphalt
Get Quote296 7 million tons [4] and that asphalt concrete typically consists of 90–95 aggregate (by weight) there is great potential for the application of RCA in asphalt road mixtures Any demolished concrete waste can be successfully utilized assuming that the necessary crushing cleaning andFrom 1 1 2” AB 3 type gradations to ”Chips and Screenings we can produce multiple products from your waste concrete or asphalt APAC Shears recycles nearly 100 000 tons of concrete and asphalt each year to continue our priorities of resource re usability and environmental preservation
Get QuoteVolumetric aggregate and asphalt characteristics must meet or exceed the current specification requirements RAP consistency is important since it includes coarse intermediate and fine particles throughout Chris Holman owner of Holman Consulting describes the process as “crushing to fit the design instead of designing to fit the crush ”Dec 02 2017 Aggregate (Base) 65 5 Used in Asphalt Concrete 9 7 Use in New Concrete Mixtures 6 5 Used as Fill 7 6 Use as High Value Rip Rap 3 2 Others 7 6 Van Dam et al 2016 after Wilburn and Goonan 1998 and USGS 2000 2012 CMRA Survey of Effects of Crushing Technique and Natural Aggregate Type on RCA Reclamation Efficiency Process
Get QuoteDec 12 2018 From the test results of the aggregate crushing values in Table 2 Wu S Zhong J Zhu J Wang D Influence of demolition waste used as recycled aggregate on performance of asphalt mixture Road Mater Pavement Des 2013 14 679–688 doi 10 1080 14680629 2013 779304
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