| IV. BRIDGE ENGINEERING
A. COMPLETED PROJECTS
|1. Preparation of Draft Specification for use of High Performance Concrete (HPC) for Pavement and Bridges made with indigenously available materials (B-32)|
April 2000 to July 2002
|Present Status and Progress|
|The final report was submitted to the Ministry after incorporating its observation. Subsequently it was further sent to the experts for their comments. Finally the extract of the report along with the comments of the experts has been sent to IRC so that the findings may take place in the guidelines for the use of HPC being formulated by IRC.|
|The recommendations for the use of HPC for Roads & Bridges works are enclosed herewith. However, some of the basic features of the research scheme are:
(i) Laboratory investigation has been carried out using OPC 43 grade for M40 grade concrete for pavements and OPC 53 grade for M60 grade cement for bridges.
(ii) Fly ash samples from Dadri plant and Talcher plant have been used in the proportion of 15% by weight of cementitious material.
(iii) Silica fume named “Elkem” has been used in proportion of 10% by weight of cementitious material in the study.
(iv) Superplasticizers namely “SP3000 (G)” has been used in proportion of 0.6 – 2.0% by weight of cementitious material in the study.
The HPC pavement are found to be having longer service life as compared to conventional concrete pavement made with ordinary Portland Cement of 43 or 53 grade. Sequential construction procedures for rigid pavements are given in IRC: 15 – 2002. The same may be adopted for HPC pavements. There is not any major change in the construction of HPC roads using HPC except the addition of defined quantities of mineral and chemical admixtures as suggested in the present specification. The difference is only the mixing procedure of Portland cement, fine aggregate, coarse aggregate, silica fume and/or fly ash.
|Final report has been submitted to the Ministry|