This document discusses quality control in concrete structures construction in Bangladesh. It identifies common causes of early concrete deterioration such as unwashed aggregates, muddy water, and excess water in mixes. It emphasizes the importance of contractor quality control plans, proper design documentation by construction engineers, and quality procedures during all stages of mixing, placing, compacting and curing concrete. Adhering to quality control can prevent errors and reduce maintenance costs by ensuring strict monitoring and rectification of faults during construction.

1. By
Md. Hachnayen Ahmed
1 63
BSCE
CONCRETE STRUCTURES QUALITY
CONTROL IN PRACTICE

2. OBJECTIVES
 Introducing the main causes of deterioration of concrete
structure in Bangladesh
 Show the concept and tools that are available to us
 Show the necessasity of Contractor and Engineering
plan prior to starting the works.

3. CONCRETE BASICS
 Portland Cement
 Aggregates (both fine &
Coarse)
 Water

4. CAUSES OF DETERIORATION
 Exposed to Weathering
 Exposed to Environment
(e.g. parking garage, exterior
balcony slab etcetera)
 Chemical reaction within the
cement matrix, aggregate and
moisture
 Fire, because of shock
heating

5. LEGAL FRAMWORK
 Planning and preparation of the entire process
 Scaffolding
 Formwork
 Reinforcement
 Concrete casting
 Care and Protection

6. CAUSES EARLY
DETERIORATION OF
CONCRETE IN BANGLADESH
 Un-Sieved Aggregates
 Un-Washed Aggregates
 Overly wet sand
 Mud water for mixing
 Rusted reinforcement
 Excess water in mix
 Excess fine aggregates
 Poor mixing ratio
 Lack of cover concrete
 Placing of concrete from a
large height by labor
 Brick efflorescence

7. CONTROCTORS QUALITY CONTROL
PLAN
 Appoint a responsible person
 Ensure the expertise , experience, independece and
impartiality of responsible person
 Submit a rough concrete design
The Contractor's documentation procedures will be subject
to approval of the Engineer before the start of the work and
to compliance checks during the progress of the work.

8. CONCRETE CONSTRUCTION ENGINEER
 Ensure or prepare correct and detailed design
documentation.
 Documentation include the quality and reliable
performance
 Design the technical documentation (site use only)
 Preparatory work (planning)
 Scraffolding and form work (before and after casting)

9. QUALITY CONCRETE PREPARATION
 Quality control procedures implement appropriate
mixing, proper compaction, correct placement and
adequate curing.
 Quality control prevents temptation of over design
 Quality control ensures strict monitoring of every stage of
concrete production and rectification of faults. Quality
control reduces maintenance costs.

10. CONCRETE WORK PERFORMANCE
Quality system in this process includes the following
activities
 Analysis of the project documents
 developing the concrete structures quality performance
plan
 Erection of scaffolding and formwork
 Casting and compaction of concrete
 Proper Curing of Concrete
 Cultivation and protection of concrete
 Actions to be carried out after the casting

11. ERRORS AND IMPROVEMENTS
• During the execution of concrete construction, errors
occur at all stages. In order to eliminate errors it is
necessary to perform the following:
 A detailed study of project documentation
 Aligning of the potential doubts before the start of
concrete works
 Quality assurance performance of reinforced concrete
structures
 Document and define all activities within the process
 It is necessary to hire professional

12. ERRORS AND IMPROVEMENTS
 Planning and providing training for all the participants
whose work affects quality
 Defining a procedure to eliminate non-compliance
performance
 Creating a concrete quality performance plan that will
elaborate the performance of the construction in
accordance with the available resources and
organizations.

13. CONCLUSION
• Causes for poor quality can be summarized as
ignorance, poor materials, poor design, poor detailing,
and poor workmanship, improper quantity of cement,
improper concrete mix, excess water, inadequate
compaction, substandard forms, inadequate curing,
inadequate cover etc and above all the lack of technical
knowledge.

14. For your time and
attentation

15. Any Questions ?