Polymers in Cement Concrete: This is a presentation made by Dr J D Bapat, at Vision 2030 Seminar on Metamorphosis in Building & Construction Industry, organised by MMROnline, at Mumbai, 31 August 2016. To view photo album please visit: https://goo.gl/photos/XwU5D3kHvX8Sg3t2A

1. VISION 2030
POLYMERS
IN
CEMENT CONCRETE
by
Dr J D BAPAT
Independent Professional
http://www.drjdbapat.com

2. VISION 2030
In Cement Concrete
POLYMERS CAN BE USED IN TWO WAYS
FIBERS
&
WATER-SOLUBLE/DISPERSIBLE FORM

3. VISION 2030
In Cement Concrete
APPLICATION OF POLYMER FIBERS

4. VISION 2030
Polymer Fibers in Cement Concrete
ADDITION OF POLYMER FIBERS BENEFICIAL
ONLY WHEN USED APPROPRIATELY

5. VISION 2030
Polymer Fibers in Cement Concrete
USE OF POLYMER FIBERS ONLY TO IMPROVE
COMPRESSIVE STRENGTH & ELASTIC
MODULUS IS NOT RECOMMENDED

6. VISION 2030
Polymer Fibers in Cement Concrete
POLYPROPYLENE FIBERS MARKEDLY
IMPROVE THE TOUGHNESS INDEX (ENERGY
ABSORPTION & IMPACT PROPERTIES) OF
THE COMPOSITE

7. VISION 2030
Polymer Fibers in Cement Concrete
HIGH EARLY STRENGTH FIBER REINFORCED
CONCRETE (HESFRC) CONTAINING FIBERS
CAN BE USED FOR SEVERAL HIGHWAY-
RELATED APPLICATIONS

8. VISION 2030
Polymer Fibers in Cement Concrete
HESFRC CAN BE USED IN CONVENTIONAL
REINFORCED & PRESTRESSED CONCRETE
STRUCTURES TO REPLACE THE PLAIN
CONCRETE

9. VISION 2030
Polymer Fibers in Cement Concrete
 FIBERS ADDED TO A CONCRETE MIX
EXPRESSED AS % OF TOTAL VOLUME OF
COMPOSITE (CONCRETE & FIBERS),
TERMED "VOLUME FRACTION" (Vf)
 Vf TYPICALLY RANGES FROM 0.1 TO 3%
 ASPECT RATIO (l/d): DIVIDING FIBER
LENGTH (l) BY ITS DIAMETER (d)
 FIBERS WITH A NON-CIRCULAR CROSS
SECTION USE AN EQUIVALENT DIAMETER
FOR CALCULATION OF ASPECT RATIO

10. VISION 2030
Polymer Fibers in Cement Concrete
Example:
 HIGH SPEED TUNNEL OR CHANNEL TUNNEL RAIL
LINK (CTRL), IS A 109 km HIGH SPEED RAILWAY BETWEEN
LONDON (UK) & CONTINENTAL EUROPE
 TUNNEL LININGS INCORPORATED CONCRETE
CONTAINING 1 kg/m³ OF PP FIBERS, DIAMETER 18 & 32 mm
 IMPROVEMENTS: MIX COHESION, IMPROVING
PUMPABILITY OVER LONG DISTANCES, FREEZE-THAW
RESISTANCE, RESISTANCE TO EXPLOSIVE SPALLING IN
CASE OF A SEVERE FIRE, IMPACT & ABRASION RESISTANCE,
RESISTANCE TO PLASTIC SHRINKAGE DURING CURING,
STRUCTURAL STRENGTH, REDUCED STEEL
REINFORCEMENT, DUCTILITY, REDUCED CRACK WIDTH

11. VISION 2030
In Cement Concrete
APPLICATION OF WATER-SOLUBLE/DISPERSIBLE
POLYMERS

12. VISION 2030
Water-Soluble/dispersible Polymers in Cement
Concrete
POLYMER MODIFIED CONCRETE CANNOT BE USED
FOR GENERAL CONSTRUCTION, BECAUSE:
(a) COST: 10—100 TIMES COSTLIER THAN PC BUT
DOES NOT SIGNIFICANTLY IMPROVE
COMPRESSIVE STRENGTH
(b) ADVERSE EFFECT ON FRESH CONCRETE
PROPERTIES, LIKE DIFFICULT MIXING &
HANDLING (.) MAY LEAD TO WORKERS
DISCOMFORT & SAFETY PROBLEMS

13. VISION 2030
Water-Soluble/dispersible Polymers in Cement
Concrete
POLYMER MODIFIED CONCRETE CANNOT BE USED
FOR GENERAL CONSTRUCTION, BECAUSE:
(a) RETARDS CEMENT HYDRATION
(b) DOES NOT WITHSTAND HIGH TEMP, FIRES
(c) ODOR AND TOXICITY

14. VISION 2030
Water-Soluble/dispersible Polymers in Cement
Concrete
SIGNIFICANT INCREASE IN BOND STRENGTH
CAN BE ACHIEVED BY ADDITION OF WATER-
SOLUBLE/DISPERSIBLE POLYMERS TO
CONCRETE

15. VISION 2030
Water-Soluble Polymers in Cement Concrete
CAN BE USED FOR CONCRETE REPAIR (.)
IMPROVES BOND BETWEEN REPAIR MORTAR &
CONCRETE

16. THANKS !!
http://www.drjdbapat.com
Email: consult@drjdbapat.com