Concrete Technology

Teacher

Vishal Kumar Singh

Category

Core Courses

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Course Name : Concrete Technology

Code(Credit) : ABC01(1-2-0)

Course Objectives

  • To study properties of cement, sand and aggregate.
    To determine the correct proportion of cement, sand and aggregate ratio for the concrete.
    To perform tests for cement, sand and aggregate
    To perform tests for concrete.
    To supervise and monitor concrete casing and casting for building construction.

Learning Outcomes

  • Demonstrate test and analysis of cement, aggregate, sand, effect of water cement ratio.
    Prepare concrete, carry out simple formwork and reinforcement with the application of modern Power Tools.
    Prepare reinforcement of different R.C.C. members i,e, Foundation, beams, columns, slabs, Retaining Wall, etc.
    Erect scaffolding and make the intricate formwork at different locations.
    Prepare a bar bending schedule and demonstrate bar bending and calculate the estimated quantity of materials.
    Make different types of arches and lintels with chajja.
    Layout different types of vertical movement according to shape, location, materials by using stair, lift, ramp and escalator.

Course Syllabus

Module I: Cement Properties (7hrs)

Theory:-
Definitions and terms related to concrete technology. Applications of concrete technology and modern trends, Cement, types of cement, relevant IS codes, comparative study of their physical & chemical properties, the significance of different properties, hydration of cement, selection of cement, storage of cement, factors affecting the strength of cement, rejection of cement. (1 hrs)

Practice:-
Test cement for consistency, setting times & strength. (4 hrs)
Perform test and analyse the effect of water-cement ratio (w/c) on the strength of cement. (02 hrs)

Module II : Aggregate/Sand (6hrs)

Theory:
Aggregate, classification (IS : 383), Grading, Characteristics (grading, fineness modulus), Bulking of fine aggregate, Deleterious substances, factors affecting the strength of concrete. Water, water quality, water requirement for hydration & workability, the effect of impurities present in water, Admixture, the meaning of terms, functions, classification, waterproofing and permeability reducing admixture. Construction Chemicals, Interpretation of specifications manufactures, Meaning of terms, functions, Classification (IS : 4082), waterproofing and permeability reducing admixture. (2hrs)
Practice:
Perform sieve analysis on aggregate and determine to grade. (02 hrs)
Determine the presence of silt and clay and Perform a test to determine bulking of sand. (02 hrs)

Module III : Preparation of Cement Concrete (5hrs)

Theory:-
Preparation of concrete Methods used, merits and demerits of methods, tools and equipment used and precautions to be taken for the following processes, batching, mixing, transportation, placing, compaction, curing, finishing, strength & durability requirements (IS : 456 - 2000), stripping of formwork, application of modern power tools, classification & specifications of concrete, classification of concrete according to grade, weight & methods of mixing ready mixed concrete, self-levelling concrete. (1hr)
Practice:-
Prepare concrete and lay at required places using power tools, perform workability tests. (2hrs)
Test strength of concrete. (2 hrs)

Module IV: PCC & RCC (6hrs)

Theory:
Nominal mixed and design mixed concrete, properties of concrete- workability & consistency, segregation, bleeding, strength, durability, impermeability, volume, stability, R.C.C. members for foundation, beams, columns, slabs, retaining wall etc. Scaffolding & formwork - Definitions of common technical terms used in Scaffolding, formwork. Types & applications Different materials used in formwork. Methods and tools used for formwork. Safety precautions to be observed in scaffolding and formwork Defects in formwork Shuttering /removal of formwork. Maintenance & repair of formwork Plain cement concrete (PCC) & Reinforced cement concrete. Properties of PCC & RCC in the green state and hardened state Importance of formwork and reinforcement in construction. (2hrs)

Practice:
Prepare reinforcement for foundation, beams, columns, slabs, Retaining Wall etc. (2 hrs)
Erect scaffolding & make formwork at different locations (02 hrs)

Module V : Reinforcing Bars (5 hrs)

Theory:-
Bar bending Technical terms & their meanings, Symbols, conventions used in bar bending, specifications of material, physical properties of reinforcing bars, estimate the quantity of material. (1 hr)
Practice:-
Making of shuttering & supports with uprights and wedges for Arches, Lintels and Lintels with Chajjahs. (2hrs)
Cutting, bending & placing of reinforcement. (2hrs)

Module VI: Reinforcement in Concrete (5 hrs)

Theory:
Structural elements & characteristics (simply supported, continuous, fixed, cantilever, overhang), the importance of the use of reinforcement in concrete, tools used in bar bending correct use of tools, different operation in bar bending (straightening of bars, cutting of bars, bending of bars, placing of bars, binding of bars, fixing of cover blocks). (1hr)
Practice:
Spanning of opening with a semi-circular arch, making centring, cutting of templates for voussoirs & preparing voussoirs, setting uprights of the arch. ( 02 hrs )
Construction of arch & removing the casing. (02 hrs)

Module VII: Stair/Lift and Escalator (2hrs)

Theory:
Use of relevant BIS codes & tables, Guidelines for laying reinforcement. Arches: - Technical terms-. types ,centring Lintel :-types,wooden, brick, stone, steel & RCC. Chajjas – characteristics, Centring & Shuttering, Stairs: Technical terms, the relation between tread & rise, Types of stairs, construction details of brick, stone & RCC stairs. Spiral stairs with precast concrete steps. The basic concept of lift and Escalator.

Session Plan

Session 1

Lecture 1 (1hr)

Topic: Properties of Concrete

Description: Definitions and terms related to concrete technology. Applications of concrete technology and modern trends, Cement, types of cement, relevant IS codes, comparative study of their physical & chemical properties, the significance of different properties, hydration of cement, selection of cement, storage of cement, factors affecting the strength of cement, rejection of cement.

Presentation_Properties of Concrete

Session 2

Practice 1 (4hr)

Objective: To test cement for consistency, setting times & strength. (4 hrs)

Description: Perform the consistency test for the cement, perform initial setting time test, also perform cubic strength test of the concrete (M20, M25, M30 and M35).

Outcome: Results of consistency of concrete, initial and final setting time of concrete. Validation of cubic strength test of concrete.

Session 3

Practice 2 (2hrs)

Objective: To perform the workability test of concrete, Perform test and analyse the effect of water-cement ratio (w/c) on the strength of cement. (02 hrs)

Description: It is selected from various workability test based on the structural members, concrete strength, transportation, selection of aggregation etc. Calculation of the water-cement ratio.

Reference

Session 4

Lecture 2

Topic: Factors affecting the strength of concrete.

Description: Aggregate, classification (IS : 383), Grading, Characteristics (grading, fineness modulus), Bulking of fine aggregate, Deleterious substances, factors affecting the strength of concrete. Water, water quality, water requirement for hydration & workability

References: NPTL
14 factors affecting the strength of concrete

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