Inspection and Quality Work Checklist for Concrete Placement - lceted

Inspection Checklist for Concrete Placement | Pre, Post and during Placement

To achieve greater strength and durability of the structural inspection of concreting works is important. So we need to make all the checks during the inspection of concrete as a checklist. The checklist will be the record of concrete placement and quality control measures taken on the site

 

 

 

We should have 3 types of checklists for concreting work

1. Checklist for Equipment and Material Preparation

2. Checklist for During Construction

3. Checklist for After concreting

We have explained all three types of checklists below,

STEP 1: CHECKLIST FOR CONCRETING WORK (Equipment and Material Preparation)

1. Aggregate for concrete material:

A.  Excessive dust is screened out from coarse aggregate.

B.   Size of aggregates is satisfactory as per specification.

C.  Stone chips must be made of crushed stone or boulder

D.  Both coarse and fine aggregates are free from all organic and deleterious materials.

E.   Aggregates are well stored on a brick flat solling platform.

F.   Percent wear of stone chips is below 30% tested by Los Angles Abrasion test.

G.  Compressive stone of stone aggregate shall not be less than 36.1 MPa or 5240 Psi.

H.  Laboratory tests confirm specifications mentioned in Sl. No. (8) and (9)

 

2. Grading of coarse aggregates:

A.  19mm sieve size- passing 95-100% is confirmed.

B.   9mm sieve size- passing 25-55% is confirmed.

C.  No. 4 (4.76mm) sieve size- passing 0-10% is confirmed.

D.  No. 8 (2.38mm) sieve size- passing 0-5% is confirmed.

E.   Sieve analysis is done and the report confirms the above criteria

 

3. Cement for concrete:

A.  Types of cement are CEM-1 as per specification.

B.   Quality of cement is satisfied as per specification.

C.  Cements are well stored, not in a moist environment.

D.  Laboratory test is done and the report confirms the above criteria

 

Other materials for concrete:

A.  Admixture as per specification is presented.

B.   Water is free from salt and other impurities.

C.  Spare Vibrator machines and vibrator nozzles are available.

D.  Proper levelling Instrument is available at the site.

E.   Aggregate measuring box and sand filter are present at the site.

F.   Slump testing apparatus is present at the site

G.  Cylinder testing equipment is present and in good condition.

 

STEP 2: CHECKLIST FOR CONCRETING WORK (During Construction)

 

 

 

1. Mix proportion is checked by the engineer:

a)   Volume of concrete is estimated and the target time is set.

b)  Admixture is used as per design specification

 

2. Manpower for concreting:

a)   Site Engineer are present while mixing and placing concrete.

b)  Work assistant at the mixing point is deputed to count and control the batch as per concrete pouring slip and load count slip.

c)   Manpower for mixing is enough with respect to the volume of work

d)  During casting sufficient shuttering men are kept for constant watch on the prop.

 

3. Adequacy of materials:

a)   Mixing portions of cement, aggregates and sand are investigated as per design specification.

b)  Adequate Materials such as cement, aggregates and sand are presented with respect to the volume of work.

c)   Aggregates are properly soaked

d)  Aggregates are well graded.

 

4. Preparation at the site for concreting:

a)   For bonding with old concrete, the edges of old concrete are to be broken to give a firm bonding.

b)  Grouting is used for construction joints. Electrical conduit is ensured in the proper place.

c)   Rain protection is arranged. Clear covers are monitored before placing concrete.

d)  Casting sequences are decided as per the consent of the engineer in charge.

 

5. Adequacy of equipment:

a)   Chutes, and concrete buckets are cleaned and ready for use.

b)  Adequate Vibrator nozles are checked and ready for use.

c)   Tower crane for vertical lifting is provided.

d)  Thickness checking device is provided.

 

6. Mixing of Concrete:

a)   Measured quantity of materials as per proportion are dumped in the drum of mixture machine.

b)  Mixing is executed with the required quantity of water for a period of not less than 2 minutes after all materials including the water are in the drum.

c)   Proper water-cement ratio is ensured by measuring slump as mentioned below:

a. Footing, pile cap, mass concrete 2" maximum

b. Precast pile, column, beam, slab 2.5" maximum

c. Ready mix concrete (with admixture) 4.0" maximum

 

7. After mixing concrete:

a)   Workability of concrete is adequate (slump is proper).

b)  Cubes/ Cylinders are taken from the mixing for testing.

c)   Slump test is conducted and found OK.

 

8. Placing of concrete:

a)   Water is sprayed on the surface of the shutter/ steel shutter.

b)  Concrete is placed within 30 minutes after mixing the water.

c)   Height of free fall concrete is within 3 feet.

d)  Concrete is layed from one end, then continuously proceeded to the other end.

e)  Fresh concrete is deposited against concrete which is in position within 45 minutes.

f)    Thickness is checked at 3’-0’’ interval over the concrete slab.

g)  Frequent movement of labours/others over reinforcement is avoided during casting. Use of plain sheet as a walkway for carrying concrete at the place.

h)  During casting, immediate remedial measures are taken in case props get loosened.

 

Compaction of Concrete:

a)   For beam and column, concrete compaction is done properly by the vibrator.

b)  Compaction is done within 15 minutes after the fresh concrete is placed in position.

c)   Vibrating is stopped as soon as the laitance of mortar appears on the surface. (Excessive vibration segregates the mix.)

d)  Vibrating is executed properly in the vertical placement of the vibrator.

e)  Vibrating is executed without touching the re-bar.

f)    Proper surface vibration of slab surface with thick & plain wooden plank.

 

STEP 3: CHECKLIST FOR CONCRETING WORK (After concreting)

 

 

a)   Movement over a concrete surface is avoided within 24 hours.

b)  Concrete surface is kept wet with water till the removal of formwork.

c)   Keys in the column-lift are provided for subsequent concreting in the proceeding days.

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