RCCIntroduction.pdf

RCC I Ammu S Kerala PSC Expert  List of Important Codes IS 456:2000 – Code of practice for plain and reinforced concrete IS 800: 2007 – LSM for the design of steel structures IS 800: 1984 – WSM method of design for steel structures IS 875:1987 Part I – Dead load...

RCC I Ammu S Kerala PSC Expert  List of Important Codes IS 456:2000 – Code of practice for plain and reinforced concrete IS 800: 2007 – LSM for the design of steel structures IS 800: 1984 – WSM method of design for steel structures IS 875:1987 Part I – Dead load Part II – Imposed Load Part III – Wind Load Part IV – Snow Loads Part V – special load & load combinations 1343 : 1980 – prestressed concrete List of Important Codes IS 1893 :2002 – criteria for earthquake resistant design of structures IS 3370: 1965 – code of practice for concrete structures for the storage of liquids. IS 10262: 2009 – guideline for concrete mix proportioning IS 13920: 1993 – code of practice for ductile detailing of concrete structures subjected to seismic forces List of Important Codes SP 6 (1) : 1964 – Hand book for structural engineers SP 16:1980 – Design Aid for reinforced concrete to IS 456:2000 SP 23: 1982 – Handbook on concrete mixes SP 24 : 1983 – explanatory handbook on OS 456:2000 SP 34 : 1987 – Handbook on concrete reinforcement and detailing IS 456:2000 5 Sections and 8 annexures 3 sections and 3 annexures are important  SECTION 2 MATERIAL, WORKMANSHIP INSPECTION & TESTING Materials Cement  SECTION 2 MATERIAL, WORKMANSHIP INSPECTION & TESTING Materials Aggregates  SECTION 2 MATERIAL, WORKMANSHIP INSPECTION & TESTING Materials Water  SECTION 2 MATERIAL, WORKMANSHIP INSPECTION & TESTING Materials Admixture Mineral admixture Fly ash Silica fume Rice husk ash Chemical admixture Accelerating admixture – calcium chloride, fluosilicate, tri ethanolamine Retarding admixture – sodium tartrate , tartaric acid Water reducing or plasticizer – calcium lignosulphate  SECTION 2 MATERIAL, WORKMANSHIP INSPECTION & TESTING Materials Reinforcement  SECTION 2 MATERIAL, WORKMANSHIP INSPECTION & TESTING Concrete Manufactured in 2 ways Nominal mix Design mix  Strength of concrete Compressive strength of concrete Tensile strength of concrete Tensile strength of concrete  Characteristic Compressive strength As per IS 456: 2000 value of strength below which not more than 5 % of the test results are expected to fail, Denoted by fck  Mean strength It is th strength in which 50% of the test results are expected to fall and 50 % are expected to pass, the strength is called mean strength Confidence limit It is the maximum probability of a test result shall be within the range of Characteristic Compressive strength Characteristic Compressive strength  Youngs modulus of elasticity of concrete As per IS 456: 2000 the youngs modulus of elasticity of concrete is Grades of concrete  Effect of creep on Youngs modulus of elasticity of concrete Long term youngs modulus of elasticity of concrete is Grades of concrete Shrinkage of concrete Thermal expansion of aggregates Workability  Workability Four tests for measurement of workability Compaction factor test – preferable for low workability Slump test – for low, medium and high value varies from 25 to 150 Vee bee test Flow test  Workability Work Range of slump values Concrete for road works 20-28 mm Ordinary RCC works 50- 100 mm Columns retaining walls 12- 25 mm Mass concrete 75-175 mm  Workability Slump in mm Compacting factor 0- 25 mm 0.78- 0.80 25- 75 mm 0.85- 0.87 50- 100mm 0.92- 0.935 100- 150 mm 0.95- 0.96 THANK YOU