The crushing value of aggregates is rather insensitive to variation in strength of weaker aggregates For this reason a simple test known as 10 percent fine value is introduced When the aggregates crushing value become 30% or higher the results are likely to be inaccurate Aggregate Crushing Load Source IS 2386 Part 4 1963 The aggregates
The Crushing Value test measures the ability of an aggregate to resist crushing under a compressive load It is a measure of the strength and toughness of the aggregate In this test a standard crushing load is applied to a prepared aggregate sample and the percentage of fines generated after the specified amount of crushing is determined
Correlation analyses among the measured parameters identified the aggregate crushing value as a promising alternative test method to quantify the crushing potential of aggregates and to adjust the gradation accordingly to produce mixtures with optimized volumetric properties Discussion open until Aug 27 2020 Permissions Request
000433 Free download as PDF File pdf Text File txt or read online for free This document describes the aggregate crushing value test procedure which is used to determine the resistance of aggregate samples to crushing under gradually applied loads The test involves applying a 40 tonne load to aggregate samples contained in a metal cylinder and measuring
S No Particulars Coarse aggregate 1 Crushing value % 2 Impact value % 3 Los angel ïsabrasion test on coarse aggregate % 4 Shape test Flakiness index % Elongation index % 5 Bulk density Bulk density of aggregate KN/ m³ 6 Specific gravity 7 Water absorption %
d Aggregate Crushing Value/Ten Percent Fines Value The coarse part of the material sampled and tested in accordance with STP and shall have Aggregate Crushing Values ACV and ten percent fines values as follows ACV % Ten percent fines Base Type I Less than 30% Greater than 125 kN Base Type II Less than 35% Greater than 90 kN
Mechanical Properties of Aggregates Aggregate Crushing Value Test Discussion • There is no explicit relation between the aggregate crushing value and its compressive strength but in general the crushing value is greater for a lower compressive strength BS 812 Part 3 specifies a maximum limit of 30 for aggregates used in structural concrete and 40 on
The aggregate crushing value which is an inverse measure of mechanical strength of aggregate is determined by the percentage of fines passing through mm IS sieve after test and it is largely influenced by factors such as the size of the test sample total applied load and rate of application drying condition and method of compacting
Les essais «10% fines load» charge produisant 10% de passant 2 4 mm et «Aggregate Crushing Value » essai d crasement sont deux essais bien accepts en Grande Bretagne pour caractriser les proprits mcaniques des granulats Dans le premier essai on dtermine la charge produisant 10% des «fines» alors que dans le
The aggregate crushing value gives a relative measure of the resistance of an aggregate to crushing under a gradually applied compressive load Discussion Due to the lack of studies representing the selected analysis aggregate and adopted crushing parameter process it was not possible to compare the obtained results with earlier analyses
However when crushing index value is greater than 24% aggregate quality is relatively poor There are much difference from the good aggregate in strength internal microstructure porosity and gap size thereby the frost resistance of RAPC is greatly influenced showing relatively larger strength loss rate and mass loss rate
Aggregate Crushing Value AS 1997 BSI BS 812 110 1990b Micro Deval Abrasion AASHTO TP 58 1999 ASTM D6928 2010 AENOR UNE EN 1097 1 2011 Results and discussion A summary of the results obtained from the Los Angeles abrasion and modified compaction tests is provided in Table 7 The values for each sample were averaged
specified or higher crushing strength Fig Aggregate Crushing value Fig Mould and plunger Testing Machine Aggregate Crushing value Testing Machine % §· u¨¸ ©¹ W2 Aggregate crushing value W1 W 1 = Total weight of the sample W 2 = weight of crushed aggregate Table Aggregate Crushing value test
To achieve a high quality of pavement aggregate possessing low aggregate crushing value should be preferred With aggregate of an aggregate crushing value higher than 30 the result may be anomalous and in such as the ten percent fines value should be determined instead SAMPLING The standard aggregate crushing test shall be made on aggregate
compressive load With aggregate of aggregate impact value AIV higher than 30 the result may be anomalous Also aggregate sizes larger than 14 mm are not appropriate to the aggregate impact test The standard aggregate impact test shall be made on aggregate passing a 14 mm BS test sieve and retained on a mm BS test sieve
In the following discussion we consider two extreme cases The preferred aggregated should have good polished stone value aggregate abrasion value aggregate impact value and aggregate crushing value Surface characteristics of the aggregate should promote proper adhesion According to ASTM D 6297 01 the used aggregate should be crushed
The aggregate crushing value test is performed on coarse aggregates to determine their resistance to crushing under a gradually applied compressive load This test measures the percentage by weight of the crushed material obtained when test aggregates are subjected to a specified load under standardized conditions The aggregate crushing value
In the Aggregate Crushing Value test a sample of aggregates is subjected to a gradually increasing compressive load until failure resulting crushing value—expressed as a percentage of the original mass—indicates the material s resistance to ACV values signify stronger aggregates that are better suited for high load
nearest whole number Report the mean as the aggregate impact value unless the individual results differ by more than times the mean value In this case repeat the test on two further specimens calculate the median of the four results to the nearest whole number and report the median as the aggregate impact value
