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.
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.
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.
