Item P-209 crushed aggregate base course63 Кб. The fine aggregate shall have a minimum sand equivalent value of 35 when tested in accordance with ASTM D 2419. Sampling and Testing.The crushed aggregate base material shall be placed on the moistened subgrade in layers of uniform thickness with a mechanical spreader.
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Aggregate impact value is the ratio of the weight of the fraction passing through 2.36 mm (weight W2) by the total weight of the sample (weight W1 + W2). Aggregate Impact Value = (W2/ (W1+W2)) * 100 = 80 gm / 300 gm = 26.67 (Impact Value) Where, W1= Weight of …
Minimum specified sand equivalent values for fine aggregate in HMA range from 26 to 60 with the most common being 45. The requirement is also dependent upon the type of HMA layer (e.g., base course or surface course). Issues with the Sand Equivalent Test. The …
The aggregate crushing value provides a relative measure of resistance to crushing under a gradually applied compressive load. To achieve a high quality of pavement, aggregates possessing low aggregate crushing value should be preferred.
The aggregate crushing value provides a relative measure of the resistance of an aggregate to crushing under gradually applied crushing load. The aggregate crushing value test is a useful guide when dealing with aggregates of unknown performance, particularly when lower strength is suspected. ... The crushed aggregates (W2) is expressed as % of ...
Maximum aggregate impact value: 1. Bituminous surface dressing penetration macadam, bituminous carpet concrete and cement concrete wearing course. 30 2. Bitumen-bound-macadam, base course 35 3. WBM base course with bitumen surfacing 40 4. Cement Concrete base course 45
COMPACTIBILITY OF CRUSHED STONE BASECOURSE MATERIAL. In this paper, the factors that affect the compaction of crushed stone were evaluated by laboratory investigation. These factors included the moisture content, the grading, aggregate shape and aggregate texture. This study was restricted to four types of g1 graded aggregate.
32 11 23 Aggregate Base Course. T99, Standard Specification for the Moisture-Density Relations of Soils. Using a 2.5 kg (5.5 ... D2419, Test Method for Sand Equivalent Value of Soils and Fine. Aggregate. ... Aggregates: Aggregates for bases shall be crushed stone, crushed slag, crushed gravel or natural ..... It is a pre-blended bulk material. C.
Table 2: Maximum allowable impact values of aggregate in different types of Pavement material/ layers Sl.No Types of pavement material /layer Aggregate impact value (%) 1 Water bound macadam, sub-base course 50 2 Cement concrete, base course 45 3 i) WBM base coarse with bitumen surfacing ii) Built-up spray grout, base course 40
Aggregate impact value, not more than: 1. Wearing Course: 30: a) Bituminous surface dressing: b) Penetration macadam: c) Bituminous carpet concrete: d) Cement concrete: 2. Bitumen bound macadam base course: 35: 3. WBM base course with bitumen surfacing: 40: 4: Cement concrete base course: 45