Question

what concrete components does the scope of the concrete work include

Answer 1

CONCRETE COMPONENTS WHICH SCOPE OF THE CONCRETE WORK INCLUDE-:

1. MATERIAL -

(A) DELIVERY STORAGE AND HANDELLING -  All materials shall be so delivered, stored, and handled as to prevent the inclusion of foreign materials and the damage of materials by water or breakage.

(B) WATER -  Water for concrete construction shall be clean and free of oil, acids, salts, or other deleterious materials.

(C) PORTLAND CEMENT -  Portland cement shall conform to NL59 and NL 71 “Type P or PA”, or ASTM Standard Specifications C 150 Type I or Type 1A latest edition, if not exist in NL.

(D) SAND (FINE AGGREGATE) -  It shall be well graded from coarse to fine aggregate and not contain more than 1% clay or 1% coal or lignite when tested according ASTM methods.

(E) COARSE AGGREGATE-  Coarse Aggregate shall be composed of hard, strong crystalline rock free form shale or other soft materials and free from any adherent coating or vegetable matter.

(F) BASE-  Unless the plans show differently, the base under all concrete work shall be a minimum of 6 inches deep and shall be constructed of selected gravel or crushed stone of such size that 100% will pass a 2 inch sieve and 98% will be retained on a No. 200 sieve.

2. FORMS-   Forms shall conform to the shape, lines grade and dimensions indicated on the drawings. They shall be substantial and sufficiently tight to prevent leakage of mortar, and shall not deflect under the weight of the wet concrete or construction loads. They shall be properly braced or tied together so as to maintain position and shape, and insure the safety of workmen and passerby. All forms shall be cleaned and oiled each time they are used.

3. FORM TIES -   Form ties approved by the engineer shall be used. These ties shall be adjustable in length and of such types as to leave no metal closer than one and one-half inches of the concrete surface.

4. OILING FORMS: The UConcrete side surface of wood forms shall be oiled before any concrete is placedU. All forms shall be greased with an approved form oil or with a good grade cup grease thinned with kerosene.

5.REMOVING FORMS-    All wall forms shall be removed when the concrete has thoroughly hardened, in which forms may be removed after 2 days.

6. PROPORTIONING-    The proportions specified are based on surface dry aggregate and Portland cement in standard unopened cloth or paper sacks as packed by the manufacturer considered as weighing 94 pounds per sack. All measurements of cement fine and coarse aggregate shall be made separately. Measurements shall be based on the weight of actual dry lose weight per cubic foot of fine and coarse aggregates used. Weighing equipment shall be arranged to permit making compensation for changes in the weight of aggregates due to moisture.

7. MIXING-   Concrete shall be mixed in a batch mixer for not less than 1-1/2 minutes after all the materials are in the mixer drum. Mixing shall continue until there is a uniform distribution of materials and the mass is homogenous in consistency and color.

8. CENTRAL OR TRANSIT MIXED CONCRETE-   Concrete from a central plant or mixed in transit mixer trucks may be used if it complies with these specifications. The Engineer will have free access to the batching plant and mixing plant at all times to sample all materials and inspect the work performed for this project.

9. PREPARATION FOR PLACING- Before beginning a run of concrete, all exceeding water shall be removed from all trenches and foundations, all equipment and forms shall be cleaned and oiled, and reinforcement shall be cleaned of ice or other foreign coatings. Concrete shall not be placed until all reinforcement is securely and properly fastened in its correct position, no until all sleeves, hangers, pipes, conducts, bolts, or any other fixture required to be embedded therein has been placed and anchored by the Contractor.

10. HANDELING - Concrete shall be handled from the mixer to forms as rapidly as possible by methods, Uwhich shall prevent any separation or loss of ingredientsU while transporting the concrete.

11. PLACING -   Placing concrete before initial set has occurred, and in no event after it has contained its water content for more than one hour. Place all concrete on clean, damp surfaces, free from water, or upon properly consolidated fills, but never upon soft mud, dry porous earth, or frozen ground.

12. DEPOSITING AGAINST OTHER CONCRETE- Before depositing new concrete on or against concrete that has hardened, the forms shall be retightened, the surface of the hardened concrete shall be roughened as required, thoroughly cleaned of foreign matter, and moistened with water.

13.PROTECTION AND CURING-    Provide adequate protection against rain, sleet, and snow before and during placement and finishing of concrete. Provide adequate protective measures to maintain the temperature of the concrete as specified.

14. DEFECTIVE WEATHER-    Any concrete work not formed as shown on the plans or for any reason is out of alignment or level or shows a defective surface shall be considered as not conforming with the intent of these specifications and shall be removed form the job by the Contractor at his expense unless the Engineer grants permission to patch the defective area which shall be done in accordance with the following procedure.

15.SURFACE FINISH OF CONCRETE-   After removal of forms, all metal devices used to tie forms together and hold them to correct alignment and location shall be removed in such a manner that no metal shall remain within less than 2 inches of the surface of the concrete.

16. FLOOR FINISH-    

17. TESTING AND REPAIRS-    Two compression test cylinders from each floor, slab, wall, and footing shall be made under the supervision of the Engineer, and one of each pair shall be crushed at 7 days and the other at 28 days.