Register Now

Login


Lost Password

Lost your password? Please enter your email address. You will receive a link and will create a new password via email.

Add question

Register Now

Properties of Aggregates and its Values for use in Construction

Properties of aggregates such as bulk density, specific gravity, voids, water absorption and its values are presented in this article.

1. Aggregates: Bulk Density, Specific Gravity and Voids

Bulk Density
River sand
Fine1.44
Medium1.52
Coarse1.60
Beach or river shingle1.60
Broken stone1.60
Stone screenings1.44
Broken Granite1.68
Specific Gravity
Trap2.9
Granite2.8
Gravel2.66
Sand2.65
Voids, Percent, Average
River sand
Fine43
Coarse35
Mixed and moist38
Mixed and dry30
Broken stone, graded
25 mm maximum size46
50 mm maximum size45
63 mm maximum size41
Stone screenings48

Note: Above values are indicative only

2. Aggregates: Limiting Values of Mechanical Properties

PropertiesLimiting Values (Percentage)
For Wearing SurfacesOther Than for Wearing Surfaces
Crushing value3045
Impact value3045
Abrasion value (Los Angeles)3050
Soundness (Average loss of weight after 5 cycles)When tested with Na2SO4When tested with MgSO4
Fine aggregates1015
Coarse aggregates1218

*Source- IS: 383 – 1970

3. Approximate Water Absorption of Aggregates, by Weight

Average sand1.0 percent
Pebbles and crushed limestone1.0 percent
Trap rock and granite0.5 percent
Porous sandstone0.5 percent
Very light and porous aggregates may absorb as much as25 percent by weight

Note: The coarser the aggregate, the less free water it carries.

4. Limits of Deleterious Materials (Percentage by Weight, Maximum)

(Clause 3.2.1 of IS: 383 – 1970

Deleterious SubstancesFine AggregatesCoarse Aggregates
UncrushedCrushedUncrushedCrushed
Coal and lignite1.001.001.001.00
Clay lumps1.001.001.001.00
Materials finer than 75-micron sieve2.0015.003.003.00
Shale1.00
Total of percentages of all deleterious materials **5.002.005.005.00

**Mica is excluded.

5. Bulking of Sands for Various Moisture Contents

Moisture, percentPercentage bulking in
Fine sandMedium sandCoarse sand
11686
2261612
3322215
4362717
5382918
6372818
8352616
10322212
1228198
1522122
171870
20900
27000

6. Surface Water Carried by Aggregates

AggregatesApproximate Qty of Surface Water
Percent by massLtr./cu.m
Very wet sand7.5120
Moderately wet sand5.080
Moist sand2.540
Moist gravel or crushed rock1.25 – 2.520 – 40

Note: Coarser the aggregate, less the water it will carry. Source: Table 10 of IS: 456 – 2000

SHARE