Recommended limits

7,827 views

Published on

Published in: Technology, Business
0 Comments
1 Like
Statistics
Notes
  • Be the first to comment

No Downloads
Views
Total views
7,827
On SlideShare
0
From Embeds
0
Number of Embeds
5
Actions
Shares
0
Downloads
134
Comments
0
Likes
1
Embeds 0
No embeds

No notes for slide

Recommended limits

  1. 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 1NOTE 1: THERE IS NO REQUIREMENT OF SHELL CONTENT IN SANDS PASSING02.36 MM SIZE SIEVELIMITS CONT..................................
  2. 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% MAXNOTE 2 : AGGREGATES MAY INITIALLY BE STRESSED FOR ITS REACTIVITY INACCORDENCE WITH ASTM C 289 & IF POTENTIAL REACTIVITY IS INDICATED ,THEN MORTER BAR TESTS IN ACCORDENCE WITH ASTM C 227 SHALL BECARRIED OUT
  3. 3. FREQUENCY OF ROUTINE TESTS ON AGGREGATES TABLE IIKIND OF REQUIREMENT TEST METHOD TEST FREQUENCY RATE1. GRADING BS 812 PART 103 EACH TWO WEEKS OR PER 100 M3 WHICHEVER IS MORE FREQUENT2. 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 METERNOTE : DRYING SHRINKAGE & POTENTIAL REACTIVITY OF AGGREGATES SHALL BEDETERMINED INITIALLY AT THE START OF THE PROJECT OR WHENEVER THERE IS ACHANGE IN THE SOURCE OF SUPPLY
  4. 4. FINE AGGREGATES1. 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 PITCHING1. 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 inTABLE 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 ofthe 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 be100 mm.CONSTRUCTION REQUIREMENTS.
  5. 5. 1. The stones shall be arranged in such a way that the largest stones are at the bottom of theslope of the sub grade or base which is firm & well compacted. The stones shall be placed ona mortar bed.GABIONS.DESCRIPTIONGabion shall consist of furnishing & placing wire mesh boxes rectangular in shape (galvanized steel fabricated in double twisted woven hexagonal shape with wire diameter of2.7 mm for mesh size of 8*10cm for boxes & of 2.2 mm of 6*8 cm for mattresses ),filledwith clean & uniform rocks larger than the mesh openings in accordance of the followingspecifications.MATERIAL1. The rock shall be greater than 150 mm in size2. 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 TREATMENTAlternative 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

×