AGGREGATE CRUSHING VALUE This test helps to determine the aggregate crushing value of coarse aggregates as per IS 2386 Part IV 1963 The apparatus used is Cylindrical measure and plunger Compression testing machine IS Sieves of sizes 10mm and Procedure to determine Aggregate Crushing Value i The aggregates passing through
Table 1 Classification of aggregate based on aggregate impact value Aggregate impact value % Quality of aggregate < 10 Exceptionally strong 10 20 Strong 20 30 Satisfactory for road surfacing >35 Weak for road surfacing Table 2 Maximum allowable impact values of aggregate in different types of Pavement material/ layers Types of
number Report the mean as the Aggregate Crushing 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 Crushing Value A data sheet is given as Form
Aggregate Crushing Value Apparatus The apparatus for Aggregate Crushing Value Test comprises the following Fig 1 Aggregate Crushing Value Apparatus A steel cylinder with a 15 cm diameter equipped with a plunger and base plate A straight metal tamping rod with a diameter of 16 mm and a length of 45 to 60 cm rounded at one end
To determine the aggregate crushing value of the given specimen 2 To determine the aggregate impact value of the given specimen 3 To determine the Specific gravity and water absorption of an aggregate sample 4 To determine the abrasion value of coarse aggregate by using Los Angles machine 5 To determine the penetration value of the
The crushing value tests were physically conducted on two kinds of coarse aggregates under two different maximum pressures of 400 kN and 600 kN respectively Finally the crushing value standard of coarse aggregates for PA mixtures was proposed The following conclusions were obtained
Aggregate Crushing Value ACV this is the measurement of the resistance of aggregate to crushing by compressive force A test specimen 10 14mm is compressed up to 400 kN and the proportion of material passing mm is the ACV mean value of two tests The higher the value the weaker the aggregate
This degree is assessed by a sieving test on the impacted specimen and is taken as the aggregate impact value AIV 4 Sampling The sample used for the test the laboratory sample shall be taken in accordance with clause 5 of BS 812 102 1989 5 Apparatus NOTE All apparatus should comply with the general requirements of BS 812 100 General
It was revealed that the resilient modulus value increased by % and % at 25 °C and 40 °C respectively The findings of this research encourage using IFS as a sustainable aggregate
It has been found that for majority of aggregates the aggregate crushing and aggregate impact values are numerically similar within close limits But in the case of frne grained highly siliceous aggregate that are less resistant to impact than to crushing the aggregate impact values are higher than the aggregate impact values Table
2 Concept and significance of the Aggregate crushing value test The aggregate crushing value test gives a relative measure of the resistance of an aggregate to crushing under a gradually applied compressive load Aggregate crushing value is defined as the percentage by weight of the crushed or finer material obtained when the test aggregates are subjected to a
3 Impact Value Impact Test on Aggregates Understanding the aggregate s capacity to withstand sudden loads or forces is crucial The impact test involves subjecting the aggregate to repeated blows and calculating the impact value [ Aggregate Impact Value = left frac{W 2}{W 1}right times 100% ] 4 Resistance Against Weathering
Aggregate crushing value = W2 x 100 / W1 W W2 =Weight of fraction passing through the appropriate sieve W1 W =Weight of surface dry sample The mean of two result to nearest whole number is the aggregate crushing value Result The aggregate crushing value of the given sample= Aggregate Crushing Values for Roads and Pavement Construction
Aggregate 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 plunger
The impact of aggregate value offers a relative resistance of aggregate measure to impact or sudden shock In addition to value of crushing the aggregate magnitude impact must not go above 45% by
Then aggregate impact value is expressed as the percentage of fines formed in terms of the total weight of the sample Observations Table Impact value of sample aggregates Aggregate crushing value test for road aggregates; Aggregate abrasion value test of coarse aggregates using Los Angels machine Tags Aggregate Facebook; Twitter
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5 DISCUSSION about the application of Aggregate Impact values & state the values used in construction industry Application of Aggregate Impact values The aggregate impact value is a determining measure of resistance to sudden impact or shock which may differ from its resistance to gradually applied compressive load determine the impact
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Record the total weight of fines passing through the sieve and calculate the crushing value using the formula Crushing Value = Weight of Fines / Weight of Sample × 100; Calculation Crushing Value = Weight of Fines / Weight of Sample × 100 Note Weight of Fines is the sum of the weights of aggregates passing through the sieve
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