Location

Arlington, Virginia

Session Start Date

8-11-2008

Session End Date

8-16-2008

Abstract

Most of the data available from the cement industry and the literature exhibits performance of concrete cubes cured in normal water. Even the literature related to the durability of concrete deals mostly with concrete cured in normal water (closer to potable water in characteristics). However, the bored-cast-in-situ piles are cured in the ground water. The development of strength of concrete of bored cast-in-situ piles depends upon the quality of ground water. The effect of sulphates and chloride is well established and most of the codes stipulate permissible limits of pH, sulphates and chlorides contents in the ground water. In the last 20 years, authors have come across a number of situations where inspite of water being certified as satisfactory, from chlorides-sulphate point of view the pile shafts have shown deterioration beyond the conceivable limits. The authors have been working on the problem to establish the effect of quality of water with reference to Ryzner index and Marble test; a parameter that plays a significant role in deciding the quality of water and Marble test as proposed by DIN. The research work involves curing of cubes of same mix in a chemically analyzed ground water as well as normal water. The properties of the concrete like cube strength, elasticity, permeability and setting time are compared. Three types of cement in three grades of concrete are used. The cubes are tested for cube strength for 1, 7, 14, 28, 45 and 90. The findings of the research programme shall be presented into the paper

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

International Conference on Case Histories in Geotechnical Engineering

Meeting Name

Sixth Conference

Publisher

Missouri University of Science and Technology

Publication Date

8-11-2008

Document Version

Final Version

Rights

© 2008 Missouri University of Science and Technology, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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Aug 11th, 12:00 AM Aug 16th, 12:00 AM

Deterioration of Bored Cast in Situ Piles Due to Aggressive Water

Arlington, Virginia

Most of the data available from the cement industry and the literature exhibits performance of concrete cubes cured in normal water. Even the literature related to the durability of concrete deals mostly with concrete cured in normal water (closer to potable water in characteristics). However, the bored-cast-in-situ piles are cured in the ground water. The development of strength of concrete of bored cast-in-situ piles depends upon the quality of ground water. The effect of sulphates and chloride is well established and most of the codes stipulate permissible limits of pH, sulphates and chlorides contents in the ground water. In the last 20 years, authors have come across a number of situations where inspite of water being certified as satisfactory, from chlorides-sulphate point of view the pile shafts have shown deterioration beyond the conceivable limits. The authors have been working on the problem to establish the effect of quality of water with reference to Ryzner index and Marble test; a parameter that plays a significant role in deciding the quality of water and Marble test as proposed by DIN. The research work involves curing of cubes of same mix in a chemically analyzed ground water as well as normal water. The properties of the concrete like cube strength, elasticity, permeability and setting time are compared. Three types of cement in three grades of concrete are used. The cubes are tested for cube strength for 1, 7, 14, 28, 45 and 90. The findings of the research programme shall be presented into the paper