Optimization of Cement Grout Mix, on Laboratory Studies (A Case Study: Water-Tightening Grouting of Karaj Tunnel)

Document Type : Scientific - Research

Abstract

Nowadays various types of materials are used for improvement of grout properties. But selection of suitable grout mix is usually chosen based on the experience of the designer. The aim of this research is using laboratory studies and grout mix choice especially for water-tightening grouting.
The procedures flowchart is depicted initially and utilized to choose grout for water-tightening grouting of Karaj water conveyance tunnel. The results obtained from the analysis and investigations of grout mixes have shown in which the purpose of high penetration ability, W/C ratio should be greater than 1.  W/C ratio equal to 2 can be named as boundary of “thick” and “thin” grouts. Associated with bleeding and penetration ability, the best grouts will be achieved at W/C ratio in the range of 1 to 1.5. High percentage of bentonit could be harmful for fresh grout properties. Utilization of Superplastizers in fine cement grouts will be more useful than coarse cement grouts. Also Sodium silicate could reduce setting time of grouts to desired time.
 

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References

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Quarterly Journal of Transportation Engineering
Volume 5, Issue 2 - Serial Number 2
January 2014
Pages 249-262

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History

  • Receive Date: 09 April 2013
  • Accept Date: 03 November 2013

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