Introduction
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This document discusses concrete technology and quality control in concrete. It provides information on the components of concrete, including cement, fine aggregate, coarse aggregate, and water. It describes different types of concrete according to binding material and purpose. The document also discusses properties of good concrete, grades of concrete, and quality control measures including testing of fresh and hardened concrete through slump tests, compression tests, split tensile tests, and flexural tests. Maintaining quality control is important from the production of materials through handling, mixing, transporting and placing concrete.
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Introduction
- 1. Concrete Technology Dr. Mohd. Zameeruddin Assistant professor, Department of Civil Engineering, MGM’s College of Engineering, Nanded (m.s) BlogSpot: mzsengineeringtechnologies Email: zameerstd1@hotmail.com; md_zameeruddin@mgmcen.ac.in
- 2. Concrete Materials Cement Fine Aggregate Coarse Aggregate Water Admixtures River Sand Fine Aggregates Coarse Aggregates © mzsengineeringtechnologies
- 3. Concrete Materials Modern concrete invariably have additional ingredients other than four components mentioned earlier 1. Chemical admixtures: (accelerators, set retarders, water reducers, etc) 2. Chemical admixtures: (Fly ash, Silica fume, Rice hush ash, and other pozzolanic material) © mzsengineeringtechnologies
- 4. Components of Concrete Concrete is made up of components sachets, aggregation of stones, which we called as aggregate embedded in cement mortar that is a cement-sand mortar, in his hardened state concrete is an aggregation of stones or similar hard material embedded in what we call cement-sand mortar. The aggregates, aggregates in normal concrete forms this skeleton matrix; it is about 60 to 65 percent by volume and rest all is 25 percent is a paste; now paste means cement and water, that combines to paste. © mzsengineeringtechnologies
- 5. Advantages and Disadvantages of Concrete Advantages Lower life cycle cost Mould-ability Robustness (Resistance against slide) Can be designed for desired property Disadvantages Lower tensile strength Lower ductility (brittle) © mzsengineeringtechnologies
- 6. Properties of Good Concrete 1. Strength 2. Durability 3. Density 4. Workability 5. Water Tightness 6. Resistance to wear and tear Types of Concrete 1. According to binding material used 2. According to design 3. According to purpose According to binding material used a. Cement concrete b. Lime concrete c. Cement-lime concrete According to design a. Plain cement concrete (PPC) b. Reinforced cement concrete (RCC) c. Pre stressed cement concrete (PSC) d. Precast concrete According to purpose a. Vacuum concrete b. Air entrained concrete c. Light weight concrete d. Pump concrete e. Self compacting concrete © mzsengineeringtechnologies
- 8. Grades of Concrete IS 456: 2000 (rev) © mzsengineeringtechnologies
- 9. Quality Control in concrete 1. The variation of quality of constituent materials 2. Variation in the mix proportion 3. Variation in the quality of batching and mixing 4. The quality of overall workmanship and supervision at the site. Poor, Good, Fair The field control i.e. inspection and testing, is an important factor to be considered for quality control. Concrete should be tested at its fresh and hardened stages to assess their strength. Accelerated strength tests by which a reliable idea about the potential 28 day strength can be obtained within few hours are effective control tools. © mzsengineeringtechnologies
- 10. Where does quality control begin? It begins in the production of material used in concrete (Sampling and testing): •Portland cement •Pozzolana •Coarse and Fine Aggregate Quality Control in concrete © mzsengineeringtechnologies Uniformity of concrete production will be no greater than the uniformity of materials used in the concrete.
- 11. Quality Control in concrete How does quality control continue? •Handling and stockpiling •Batching and Mixing •Sampling and testing fresh concrete •Transporting and placing the freshly mixed concrete. © mzsengineeringtechnologies
- 12. To know the quality of concrete, We can do the several tests. Tests on Fresh Concrete: •The Slump test •The Compacting Factor Test Tests on Hardened Concrete •Compression Test •Tensile Strength Test (Split Cylinder Test) •Flexural Strength Test Quality Control in concrete Slump Test Compression Test Split tensile Test Flexural Test © mzsengineeringtechnologies