Highway Research Record No. 39 - Indian Roads Congress

a. proJeCtS reporteD For tHe FIrSt tIMe
1. Investigation of Causes of Longitudinal
Cracking in Concrete Pavements on National
Highways
Date of Start : June 2012
Date of completion : March 2013
CSIR – Central Road Research Institute, New
Delhi-110 025 (R)
Scope & Objective
Concrete pavements at many locations have been
constructed in the last 8-10 years under NHDP.
These concrete pavements have been designed and
constructed for the design life of 25-30 years. The
structural failure at some of these concrete highways,
for examples Indore By-pass, Kanpur-Allahabad,
Balasore-Orissa, Chittorgarh – Mangalwar, have
occurred because of full depth longitudinal cracking. A
thorough investigation of causes of longitudinal cracking
is urgently required to help built better concrete roads
in future. The objective of the project is to carry out
detailed investigation and possible ways of avoidance
of such cracking.
Methodology
The investigation will be carried out by taking concrete
cores over the longitudinal joints and cracks to measure
the in-situ strength of concrete, to measure the depth of
saw cut and crack. Surface strain gauges will be used to
measure dynamic strain induced at the top of concrete
slabs under traffic loads. Axle load survey and traffic
survey will be conducted and the data will be utilized
for stress – strain analysis.
Significance/ utilization Potential
Premature failure, as has happened at the location of
the proposed project, of concrete pavements which
are expected to provide long lasting durable roads,
is a major concern for the development of such
pavements in the country. The findings of the project
will help the agencies involved in the development of
highways especially that of concrete to take care in
future construction of such pavements that will not fail
prematurely.
Further information/ Copy of report can be obtained
from
The Director, CSIR- Central Road Research Institute,
Mathura Road, New Delhi-110025, Mobile:
+919841293435, phone: 011-26848917, Fax: 011-
26845943, e-mail ID: director.crri@nic.in , binod.crri@
nic.in
ROAD RESEARCH IN INDIA 2011-12 19
2. Utilization of Waste Foundry Sand in Pavement
Quality Concrete and Dry Lean Concrete
Date of Start : August 2012
Date of completion : August 2014
CSIR – Central Road Research Institute, New
Delhi-110 025 (R)
Scope & Objective
Foundry sand is a waste of foundry industries. The
objectives of the study are:
I. To evaluate the engineering properties of foundry
sand
II. To evaluate the properties of Pavement Quality
Concrete (PQC) and Dry lean Concrete (DlC)
mixtures prepared with foundry sand as partial
replacement of natural sand.
III. To develop the methodology of possible beneficial
use of foundry sand in PQC and DlC mixes for
road construction.
Methodology
Foundry sand will be collected from metal casting
industries. Engineering properties like gradation,
fineness modulus, water absorption, specific gravity,
strength etc. of all the materials including foundry sand
will be tested in the laboratory. Control concrete mixes
for PQC and DlC will be designed for two-three different
water –cement ratios using natural sand/crushed stone
dust as fine aggregate. Different amounts of foundry
sand then will be used as partial replacement of fine
aggregate used in the control mixes. Samples will be
prepared in the laboratory with different contents of
foundry sand at all the water-cement ration. Samples
will be tested for various properties of concrete like
compressive and flexural strength, drying shrinkage,
abrasion resistance etc. Based upon the analysis of
test results, the feasibility and extent of using foundry
sand in concrete will be determined.
Significance/ utilization Potential
The study will lead to possible innovative utilization of
foundry sand in construction of concrete roads apart
from its present use in land fill application. The use
of waste foundry sand, if could be feasible, will not
only provide for its better utilization but also will help
in conserving the precious natural resource of natural
sand.
Further information/ Copy of report can be obtained
from
The Director, CSIR- Central Road Research
Institute, Mathura Road, New Delhi-110025,