Highway Research Record

II. PAVEMENT ENGINEERING AND PAVING MATERIALS
1. SOIL STABILISATION, LOW GRADE MATERIALS AND LOW VOLUME ROADS
NEW PROJECTS
Study and Measures of Road Construction in Presence of Harmful Salts in UP

Date of Start: April 2004
Research Institute, UP PWD, Lucknow (R,I)

Scope and objectives

Harmful salts are sometimes found in soil. It badly damages the roads and its ingredients. The present study is to develop a method of construction of road in presence of harmful salts and to study the existing techniques for construction of road in salt infested area.

Methodology
It is proposed to conduct this project under following steps:
(i) Collection of soil samples from salt infested area.
(ii) Soil classification and testing of present harmful salts in collected soil as per Indian Standards.
(iii) Study of the salts present in the soil (salt /soil profiles with the change of the season) (iv) Study and analysis of the      prescribed standard limits of the salts.
(v) Four reaches of 500m length each shall be taken for the treatment. In first reach, polythene sheets of 0.8 mm thickness      and borrowed earth shall be provided. In second reach, soil stabilization with hydrated lime shall be carried out and      subsequent to stabilization Australian Babool shall be planted on shoulder slopes. In third reach, cement and bitumen      cutback  shall be used to stabilize the soil and local grass shall be promoted over it. In fourth reach, coir-rope/coir-net shall      be used for the stabilization of the soil.
(vi) After treatment, at every six months interval soil samples shall be collected and the presence of harmful salts shall be       evaluated for two years.
(vii) In addition to this, effect of salts on bricks used in brick-edging shall be evaluated. Decomposition of the size and shapes of       the bricks shall be studied.

Utilisation Potential
The study will provide new factual information regarding the measures to be taken for the road construction in areas infested by harmful salts.

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