1. LIMITS FOR PHYSICAL, CHEMICAL &MECHANICAL
PROPERTIES OF AGGREGATES FOR CONCRETE
TABLE I
TEST PERMISIBLE
KIND OF REQUIRMENT METHOD LIMITS
BS 812 ASTM FINE COARSE
GRADING PARE 103 STD STD
MATERIALS FINER THAN 0.075 MM PART 103
NAT-URAL , UNCRUSHED / MAX. 3 % MAX. 1 %
CRUSHED MAX. 7 % MAX. 1 %
CRUSHED ROCK
CLAY LUMPS & FRIABLE PARTICLES C 142 MAX. 1 % MAX. 1 %
LIGHT WEIGHT PIECES C 123 MAX. 0.5 % MAX. 0.5%
ORGANIC IMPURITIES, TEST 8 OF MAX. 0.05%
BS1377
WATER ABSORPTION C 128 / MAX. 2.3 % MAX. 2 %
C 127
SPECIFIC GRAVITY ( APPARENT ) C 128 / MIN. 2.6 MIN. 2.6
C 127
SHELL CONTENT IN AGGREGATES PART 106
COARSER THAN 10 MM MAX. 5 %
BETWEEN 5 MM & 10 MM MAX. 15 %
BETWEEN 2.36 MM & 5 MM MAX. 10 %
FINER THAN 2.36 MM NOTE 1
NOTE 1: THERE IS NO REQUIREMENT OF SHELL CONTENT IN SANDS PASSING
02.36 MM SIZE SIEVE
LIMITS CONT..................................

2. LIMITS FOR PHYSICAL,CHEMICAL & MECHANICAL
PROPERTIES OF AGGREGATES FOR CONCRETE
( TABLE I CONTINUE )
TEST PERMISIBLE
KIND OF REQUIRMENT METHOD LIMITS
BS 812 AST FINE COARSE
M
PARTICLE SHAPE PART 105.1 MAX. 25 %
FLAKINESS INDEX 105.2 MAX. 25 %
ELONGATION INDEX
ACID SOLUBLE CHLORIDES , CL PART 117,
FOR REINFORCED CONCRETES APPEN. C
MADE WITH SRPC CEMENTS MAX 0.03 % MAX 0.01 %
OPC & MSRPC CEMENTS MAX 0.05 % MAX 0.02%
FOR MASS CONCRETE MADE WITH
SRPC CEMENT MAX 0.03 % MAX.0.02 %
OPC & MSRPC CEMENTS MAX0.05 % MAX. 0.04 %
FOR PRESTRESSED CONCRETE &
STEAM CURED STRUCTURAL MAX 0.01 % MAX. 0.01 %
CONCRETE
ACID SOLUBLE SULPHATES, SO3 PART 118 MAX. 0.3 % MAX. 0.3 %
SOUNDNESS , MgSO4 ( 5 CYCLES ) C 88 MAX. 12 % MAX. 12 %
MECHANICHAL STRENGTH
10 % FINE VALUE PART 111 MIN. 100KN
OR IMPACT VALUE PART 112 MAX. 30 %
LOS ANGELES ABRASION C 131/ MAX. 30 %
C535
DRYING SHRINKAGE PART 120 MAX 0.05 %
POTENTIAL REACTIVITY , NOTE 2
OF AGGREG., CHEMICAL METHOD C 289 INNOCOUS INNOCUOUS
OF CEMENT- C 227 6 MONTH 6 MONTH
AGGREG.COMBINATION EXPANSION EXPANSION
0.10 % MAX 0.10% MAX
NOTE 2 : AGGREGATES MAY INITIALLY BE STRESSED FOR ITS REACTIVITY IN
ACCORDENCE WITH ASTM C 289 & IF POTENTIAL REACTIVITY IS INDICATED ,
THEN MORTER BAR TESTS IN ACCORDENCE WITH ASTM C 227 SHALL BE
CARRIED OUT

3. FREQUENCY OF ROUTINE TESTS ON AGGREGATES
TABLE II
KIND OF REQUIREMENT TEST METHOD TEST FREQUENCY RATE
1. GRADING BS 812 PART 103 EACH TWO WEEKS OR PER 100 M3
WHICHEVER IS MORE FREQUENT
2. MATERIAL FINER THAN 0.075 BS 812 PART 103 - DO -
MM
CLAY LUMPS & FRIABLE ASTM C 142 - DO -
PARTICLES
ORGANIC IMPURITIES BS 1377 TEST 8 EACH MONTH OR PER 200 M3
WHICHEVER IS MORE FREQUENT
WATER ABSORPTION ASTM C 128 / C 127 - DO -
SPECIFIC GRAVITY ASTM C 128 / C 127 - DO -
SHELL CONTENT BS 812 PART 106 EACH TWO MONTHS OR PER 100 M3
WHICH EVER IS MORE FREQUENT
PARTICLE SHAPE BS 812 PART - DO -
105.1,105.2
ACID SOLUBLE CHLORIDES , CL
QUALITATIVE - BS PART 117 ON EACH DELIVERY TO SITE
APPENDIX A / B
QUANTITATIVE - BS 812 PART 117 EACH WEEK IF RESULT IS MORE
APPENDIX C THAN 75 % OF THE LIMIT & EACH
MONTH IF RESULT IS LESS THAN 75
% OF THE LIMIT
ACID SOLUBLE SULPHATE , BS 812 PART 118 EACH TWO WEEKS IF RESULT IS
SO4 MORE THAN 75% OF THE LIMIT &
EACH TWO MONTHS IF RESULT IS
LESS THAN 75 % OF THE LIMIT
SOUNDNESS MgSO4 ( 5 CYCLES ASTM C88 EACH TWO MONTHS
)
MECHANICAL STRENGTH
% FINES OR IMPACT VALUE BS 812 PARTS 111,112 EACH THREE MONTHS
LOS ANGLES ABRASION ASTM C 131 / C535 - DO -
MOISTURE VARIATION IN BY MOISTURE TWICE DAILY
SAND METER
NOTE : DRYING SHRINKAGE & POTENTIAL REACTIVITY OF AGGREGATES SHALL BE
DETERMINED INITIALLY AT THE START OF THE PROJECT OR WHENEVER THERE IS A
CHANGE IN THE SOURCE OF SUPPLY

4. FINE AGGREGATES
1. The gradation of fine aggregate shall be in accordance with BS 882 latest edition
excluding grading designation F.
2. Each batch of aggregate delivered to site shall be kept separate from previous batches &
shall be stored for at least 3 working days before use to allow inspection & tests to be
carried out.
3. Fine aggregate shall be clean sharp natural & / or crushed sand & shall be within BS 882
ZONES C & M only.
4. Aggregate shall be mechanically washed to remove salts & other impurities in order to
meet the requirement specified. ( contractor)
COARSE AGGREGATE FOR CONCRETE.
1. Coarse aggregate shall be prepared as single sized aggregate & blended to produce
normal size grading. The combined grading shall be within the appropriate grading limits
given in BS 882.
2. Aggregates that are deleteriously reactive with the alkalis in the cement in an amount
sufficient to cause excessive expansion of concrete shall not be used.
3. Aggregate shall be mechanically washed to remove salts & other impurities in order to
meet the requirement specified. ( contractor)
COMBINED AGGREGATE.
1. Approved coarse aggregate & fine aggregate in each batch shall be combined in
proportions as specified in BS 882 & as approved by the engineer. However ,in no case
shall materials passing the 0.075 mm ,sieve exceed 3% by wt. of the combined
aggregate.
2. The combined aggregate gradation used in the work shall be as specified except when
otherwise approved or directed by the Engineer. Changes from gradation to another shall
not be made during progress of the work unless approved by the Engineer.
MATERIALS FOR STONE PITCHING
1. Stone for pitching shall be hard, sound, durable, stones as approved by the Engineer.
Samples of the stone to be used shall be submitted to & approved by the engineer before
any stone is placed.
2. The requirements for the properties of the stone shall comply with the following values in
TABLE I.
TEST STANDARD LIMIT
Los Angeles Abrasion ASTM C-535 45% Max.
Specific gravity ( Apparent ) ASTM C 127 2.5 Min.
Absorption ASTM C 127 03% max.
3. The size & shape of the stones shall be such to allow for proper placement. The width of
the stone shall not be less than one & one half ( 1-1/2 ) times their respective thickness &
lengths of not less than two ( 2 ) times their respective widths. The minimum width shall be
100 mm.
CONSTRUCTION REQUIREMENTS.

5. 1. The stones shall be arranged in such a way that the largest stones are at the bottom of the
slope of the sub grade or base which is firm & well compacted. The stones shall be placed on
a mortar bed.
GABIONS.
DESCRIPTION
Gabion shall consist of furnishing & placing wire mesh boxes rectangular in shape (
galvanized steel fabricated in double twisted woven hexagonal shape with wire diameter of
2.7 mm for mesh size of 8*10cm for boxes & of 2.2 mm of 6*8 cm for mattresses ),filled
with clean & uniform rocks larger than the mesh openings in accordance of the following
specifications.
MATERIAL
1. The rock shall be greater than 150 mm in size
2. The rocks shall consist of clean solid rock non-friable & resistant to weathering &
frost action meeting the following requirements:-
TEST STANDARD LIMIT
Bulk Specific gravity ASTM C 128/C127 2.6 Min.
Absorption ASTM C 128/C127 02 % Max.
Soundness by MgSo4 ASTM C 88 12 % Max.
METHODS OF SOFT AREA TREATMENT
Alternative methods of soft area treatment which may be directed by the Engineer:-
1. Non friable Boulders of sizes between 150 - 300 mm shall be end dumped over the soft
area & rolled until the area is stabilized to the satisfaction of the Engineer. Further stones
of 10 - 70 mm size shall be rolled into the area until all the areas are leveled & well
blinded.
2. Crushed rock material free from dirt , organic matter, shale & any other deleterious
material. The acceptance criteria when graded according to BS812 Part 103 shall be as
follows:
SIEVE SIZE % PASSING
150 MM 100
100 80 - 100
37.5 -
25 20 - 50
19 -
9.5 0 - 15