General Notes for civil Engineering

General Notes for civil Engineering

   Electrical conduits shall not run in column

   Earth work excavation for basement above 3 m Should be stepped form

  Any Back filling shall be compacted 95% of dry density at the  optimum moisture content and in layers not more than 200mm for filling above structure and 300 mm for no structure

   F SOLING IS SPECIFIED THE SOLING STONES SHALL BE LAID  AT 45° TO 60° INCLINATION (AND NOT VERTICAL) WITH  INTERSTICES FILLED WITH SAND OR MOORUM.

   Y REPRESENTS TOR STEEL GRADE - Fe-415 OF IS:1786. WITH  CHARECTERISTIC YIELD STRENGTH OF 415 N/MM MINIMUM.

  ∅  REPRESENTS MILD STEEL GRADE - 1 OF IS:432 (PART-1)

   ALL REINFORCEMENT SHALL BE FREE FROM MILL SCALES, LOOSE RUST & COATS OF PAINTS, OIL OR ANY OTHER  SUBSTANCES.

   BY PROVIDING PROPER COVER BLOCKS, SPACERS, CHAIRS  ETC.. ALL REINFORCEMENT SHALL BE PLACED AND  MAINTAINED IN POSITION  AS SHOWN IN STRUCTURAL  DRAWING

   CEMENT SHALL BE 43 GRADE ORDINARY PORTLAND CEMENT  CONFORMING TO IS:8112 OR53 GRADE ORDINARY PORTLAND  CEMENT CONFORMING TO IS:12269-1987.

    CEMENT SHALL BE STORED IN DRY PLACES ON A RAISED  PLATFORM ABOUT 200mm ABOVE FLOOR LEVEL AND 300mm

AWAY FROM WALLS. BAGS TO BE STACKED NOT MORE THAN  10 BAGS HIGH IN SUCH A MANNER THAT IT IS ADEQUATELY  PROTECTED FROM MOISTURE   AND CONTAMINATION.

   WATER USED FOR BOTH MIXING AND CURING SHALL BE  CLEAN AND FREE FROM INJURIOUS AMOUNTS OF OILS, ACIDS, ALKALIS, SALTS, SUGAR AND ORGANIC MATERIALS OR  OTHER SUBSTANCES THAT MAY BE DELETERIOUS TO  CONCRETE OR STEEL. THE pH SHALL BE GENERALLY BETWEEN 6 AND 8.

CEMENT SHALL BE TESTED FOR ITS SETTING. 

1.  THE INITIAL SETTING TIME SHALL NOT BE LESS THAN 30 MINUTES.   

2.  THE FINAL SETTING TIME SHALL NOT BE MORE THAN 10 HOURS.SAMPLES FROM FRESH CONCRETE SHALL BE TAKEN AND AT LEAST A SET OF 6 CUBES OF 150mm SHALL BE PREPARED AND CURED.

3. CUBES EACH AT 7 DAYS AND 28 DAYS SHALL BE TESTED FOR COMPRESSIVE STRENGTH. THE TEST RESULTS  SHOULD BE SUBMITTED TO ENGINEER FORAPPROVAL. IF  RESULTS ARE UNSATISFACTORY NECESSARY  ACTION/RECTIFICATION/REMEDIAL MEASURES HAS TO BE  EXERCISED.

A SET OF CUBE TESTS SHALL BE CARRIED OUT FOR EACH 30 Cum OF CONCRETE / EACH LEVELS OF CASTING / EACH BATCH OF CEMENT.

WATER CEMENT RATIO FOR DIFFERENT GRADES OF  CONCRETE SHALL NOT EXCEED 0.45 FOR M20 AND ABOVE  AND 0.50 FOR M10 / M15 CONTRACTOR / MIX DESIGNER TO

CARRY OUT THE NECESSARY INITIAL (PRELIMINARY) TESTS.

FOR CONCRETE GRADES M20 AND ABOVE APPROVED ADMIXTURE SHALL BE USED AS PER MIX DESIGN  REQUIREMENTS.

About Author:

I am Thomas Britto here to share my experiences in the civil engineering field to all my readers.Today many students are struggling to buy books at high prices. So I decided to start a blog and share my experience and knowledge with all my readers.

Let's Get Connected: Twitter | Facebook | Google Plus