High Performance Concrete Using Fumed Silica

WELCOME

SEMINAR REPORT ON

HIGH PERFORMANCE CONCRETE USING FUMED SILICA

PRESENTED BY

APARNA G KRISHNA

S7 CIVIL

ROLL NO. 11

GUIDED BY Mrs. S. USHA Asst Professor Dept. of Civil Engineering

INTRODUCTION

• High performance concrete is a concrete having low water binder ratio. A value of 0.4 is suggested as boundary between usual concrete and high performance concrete.• It has high strength and durability. For high durability low permeability is required and to reduce permeability silica fume is used

DEFENITION

• It should have maximum water cement ratio of 0.4, a maximum durability of 80% and a minimum compressive strength of 69Mpa at 28 days.

DURABILITY OF HPC

From durability point of view, it is important to achieve low permeability as quick as possible.

FUMED SILICA

SiCl4+2 H2O SiO2 + 4HCl

MECHANISM OF HPC

EXPERIMENTAL STUDY

Materials

• Cement

• Water

• Coarse aggregate

• HRWRA

DESIGN MIX

Ratio of Cement fine and Coarse aggregate = 1: 1.35:1.68

W/(C+P) ratio = 0.31

Slump = 25 to 50mm

RESULTS AND DISCUSSIONS

Age

3 day

7 day

28 day

Average compressive strength

(Mpa)

24

40

63

Age

3 day

7 day

28 day

Average compressive strength

(Mpa)

31.5

43

64.5

Age

3 day

7 day

28 day

Average compressive strength

(Mpa)

32

43.5

66

Mineral admixture such as fumed silica is an ideal constituent' for high performance concrete as it has the inherent ability to contribute to continued strength development through their pozzolanic / cementations reactivity and to enhance durability and chemical resistance through their pore refinement and reduced sorptivity characteristics.

CONCLUSION

1. B.N.Krishnaswami & J.K. Dattetreya,(march 2007), Durability Aspect Of High Performance Concrete,Indian concrete journal , page 31-39

2. Dr.A.K.Mullick,(September 2005), High Performance Concrete In India, Indian Concrete journal, page 7-12

3.M.S.Shetty, Text book of concrete technology

REFERENCE

THANK YOU