C55~C30 or concrete featured with anti-freezing, anti-permeability or other special requirements
≤1.0
≤C25
≤2.0
Clay lump content (%)
Concrete strength grade
≥C60
≤0.2
0.1
C55~C30 or concrete ﹤C30 and featured with anti-freezing, anti-permeability or other special requirements
≤0.5
≤C25
≤0.7
Total content of acicular, flaky particles (%)
Concrete strength grade
≥C60
≤8
3
C55~C30
≤15
≤C25
≤25
Crushing value index (%)
Type of rock
Concrete strength grade
Crushing value index
7.7
Crushed rock
Sedimentary rock
C60~C40
≤10
≤C35
≤16
Metamorphic rock or plutonic igneous rock
C60~C40
≤12
≤C35
≤20
Extrusive igneous rock
C60~C40
≤13
≤C35
≤30
Pebble
C60~C40
≤12
≤C35
≤16
Organic content
The color shall not darker than the standard. If it do, the substance should be process as concrete for strength contrast test with a compressive strength ratio not smaller than 0.95.
Qualified
Rigidity
Mass loss rate (%)
Applicable to concrete used outside at severe cold or cold areas or usually at a wet state or an alternate wetting or drying state; concrete with corrosive medium function or usually at areas of water level change under the ground or with requirements for anti-fatigue, wear-resistance or shock-resistance.
≤8
2
Applicable to concrete used for other conditions.
≤12
Rock strength (MPa)
Should be at least 20% higher than processed concrete in strength.
130
Content of sulfide and sulfate (%)
≤1.0
0.12
Apparent density (kg/m3)
--
2670
Bulk density (kg/m3)
--
1520
Tight density (kg/m3)
--
1580
Porosity (%)
Loose
--
43
Tight
--
41
Water absorption (%)
--
0.86
Moisture content (%)
--
0.9
Chloridion (%)
--
0.001
Alkali content (%)
--
5.12
Radioactivity
Internal exposure index Ira
≤1.0
0.3
External exposure index Ir
≤1.0
0.5
Grain Composition
Nominal size (mm)
80
63
50
40
31.5
25.0
20.0
16.0
10.0
5.00
2.50
(5~20) mm grain composition range accumulated screening (%)
-
-
-
-
-
0
0~10
-
40~80
90~100
95~100
Actual accumulated screening (%)
/
/
/
/
/
0
4
26
66
94
99
Screening conclusion
The grain composition of the sample is in conformity with (5~20) mm continuous composition range.