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Concrete structure quality control in practice
- 1. By Md. Hachnayen Ahmed 163 BSCE CONCRETE STRUCTURES QUALITY CONTROL IN PRACTICE
- 2. OBJECTIVES Introducing themain 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 PortlandCement 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 Planningand preparation of the entire process Scaffolding Formwork Reinforcement Concrete casting Care and Protection
- 6. CAUSES EARLY DETERIORATION OF CONCRETEIN 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 Qualitysystem 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 forpoor 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 timeand attentation
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