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CT Lecturing Approach

The document discusses the teaching of concrete technology and the mechanism of plasticizers and super plasticizers in concrete. It explains how plasticizers disperse cement particles and retard hydration reactions by forming a film on cement particles.

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jayanth
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78 views1 page

CT Lecturing Approach

The document discusses the teaching of concrete technology and the mechanism of plasticizers and super plasticizers in concrete. It explains how plasticizers disperse cement particles and retard hydration reactions by forming a film on cement particles.

Uploaded by

jayanth
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOC, PDF, TXT or read online on Scribd
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NEW HORIZON COLLEGE OF ENGINEERING

Pedagogical Methods /Innovative Teaching Pedagogy Report


Department Civil Academic 2021-22
Engineering Year
Course Code 19CIV43 Course. Concrete Technology Semester: IV
Name
Total No of Name of the Dr.Vinay Kumar B M Date 21.04.2022
Students 76 Faculty

Topic Name: Mechanism of Plasticizers


In this class lecturing approach is adopted for teaching.

The mechanism of the plasticizers and super plasticizers in the concrete is


explained in the teaching:
1. Dispersion:
Portland cement being very fine, its particles have a tendency to move and collect
Brief report in pockets of the wet concrete forming bunch of particles. In other words cement
about the has a tendency to flocculate in wet concrete. These bunch of cement particles or
incorporated flocculations entrap certain amount of water used in the mix. Thus the total water
teaching used in the mix is not available for producing fluidity in the mix.
Pedagogy The principal active components of water reducing admixtures are surface active
agents which concentrate at the interface between two immiscible phases, which
alter the physicochemical forces at the interface
When plasticizers are used, their surface active agents are attracted and hold at
the surface of cement particles i.e. the surface active agents are adsorbed on the
cement particles. Due to this adsorption the cement particles get negatively
charged and produce repulsive force on the particles, which repulse the particles
away from each other and neutralize the force of attraction of the particles
resulting in stabilizing their dispersion
2. Retarding Effect
The plasticizer gets adsorbed on the surface of cement particles and forms a thin
film. This film prevents the surface hydration reaction between the water and
cement particles as long as sufficient molecules of Plasticizer are available at the
particle or solution interface. The quantity of available plasticizer will decrease
progressively as the polymers become entrapped in hydration products.
Snapshot

Dr.Vinay Kumar B M

Faculty HOD

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