Highway Research Record

New Concept & Study of Tolerance Factors which Results Determination of Crust Thickness after Consolidation with regard to Old as well as New Pavements

Duration: : April 2004
Research Institute, UP PWD, Lucknow (R,I)

Scope and Objectives
On newly constructed road by different stone-ballast with the passage of time, there is deduction in crust thickness. In this project, reduction in crust thickness in old as well as new pavements with the passage of time shall be made with respect to IRC & MoSRTH code. In addition to this, deduction in crust thickness with passage of time shall also be made where local earth is being used in place of screening material as specified in IRC & MoSRTH code.

It is proposed to conduct the project through the following steps:
(i) After scrapping painted surface and removing undulations in first 500 m reach of km. 3 of Mohantalganj MDR-52, WBM grade     II, 10 cm loose & Shankargarh stone ballast shall be laid over it.
(ii) In second 500 m reach, WBM grade II & III shall be laid with local earth instead of screening and binding material.
(iii) In first 500 mt. reach of fourth km. WBM grade II & III with Shankargarh stone ballast shall be laid as per MoSRTH      specification. Traffic shall be allowed over it for 6 months without laying surface dressing. Cost evaluation of deduction in         crust thickness shall be made (without painting work)
(iv) In next 500 m reach of km. 4 & 5 (0-500), Kabrai stone ballast shall be used. Deduction in crust thickness shall be      evaluated for this type of ballast.
(v) Laboratory testing for physical properties of the available stone ballast, voids in loose state of stone ballast, density achieved      in case of graded and non-graded stone ballast shall be done. The comparison of the fieldwork and the laboratory work     shall be studied in detail.

Significance/Utilisation Potential
The study will provide factual information with regard to reduction in crust thickness with the passage of time.

The proposal is in the initial stage and has been placed for approval.