Highway Research Record No. 39 - Indian Roads Congress

a. proJeCtS reporteD For tHe FIrSt tIMe
1. Development of Low Energy (Warm) PMB and
CRMB mixes.
Date of Start : 01/04/2011
Date of Completion (Targeted) : 31/03/2013
CSIR-Central Road Research Institute, New
Delhi – 110 025 (R)
Scope and Objectives
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Development of low energy PMB and CRMB
mixes.
Mechanistic characterization of low energy mixes.
Methodology
laboratory Study of Materials, Design of Mixes,
Performance testing, Inferences, observations.
Interim Conclusions/Supporting Data
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Polymer modified warm mix asphalt leads to
significant reduction in temperature related to
pavement construction such as mixing, lay down,
and compaction of bituminous mixtures.
Results of void analysis indicate that polymer
modified bitumen mix containing 2 Per cent warm
mix additive can be compacted at 15-25°C lower
temperature to achieve design voids in mix.
Indirect tensile strength ratio indicate better
performance of polymer modified warm mix asphalt
compared to traditional hot polymer modified mix.
• The modified mix with 2 Per cent surfactant has
higher resistance to permanent deformation
and higher creep recovery at high temperature
indicating better performance of warm polymer
modified mixes.
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laboratory performance of polymer modified
bitumen warm asphalt mixes is better than
conventional polymer modified bitumen mixes
indicate suitability of these mixes for road
construction under heavy traffic.
Reports/Publications
laboratory performance of polymer modified warm mix
asphalt. IRC Journal Accepted.
Further information/Copy of report can be obtained
from
Dr. P. K. Jain, Chief Scientist & Head, Flexible Pavement
Division, Central Road Research Institute, New Delhi
– 110025, Mobile 9910113992, phone 011-26311117,
Fax 011-26845943, e-mail ID: pramodj.crri@nic.in
ROAD RESEARCH IN INDIA 2011-12 9
2. Study on Use of Emulsion Based Warm Mix
Asphalt Using Half Warm Aggregates for
Bituminous Road Construction
Date of Start : 01/10/2011
Date of Completion (Targeted/Actual):
31/12/2014
I. CSIR-Central Road Research Institute New
Delhi – 110 025 (R)
II. Yala Construction
Scope and Objectives
The objective of this study is to investigate performance
of half warm mixes (emulsion based) on a National
Highway in India to draft guidelines for large scale
constructions and to reduce carbon footprint.
Methodology
Evaluation of Materials, Design of Mix, Construction of
Experimental Section using hot mix plant with minor
modifications and periodic performance evaluation for
three years.
Interim Conclusions/Conclusions/Supporting Data
The study presented in the present paper is aimed to
design half warm mixes using half warm aggregate and
bitumen emulsion heated to a moderate temperature
of 70+10°C. The results of performance parameters
such as rutting, resilient modulus, creep deformation,
and retained strength upon immersion in water are
also investigated. A pilot field study has also been
conducted dealing with construction of 1 km long test
section for study of the performance of half warm dense
mixes using bitumen emulsion on a National Highway
(NH-27, km 160.00 to 160.932 near Gondal, Rajkot) in
Gujarat.
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Half warm asphalt mixtures manufactured using
cationic bitumen emulsion investigated in laboratory
have properties identical to traditional hot asphalt
mixture.
Performance properties like rutting resistance,
indirect tensile strength ratio resilient modulus and
static creep test results are acceptable.
The WMA mixture appears to have good coating,
and workability at a temperature of 80-90°C
WMA mixture can be manufactured laid with
conventional construction equipment.
The energy saving due to reduced fuel consumption
is high.
WMA can be stored if laying is not feasible due to
adverse weather, Paving window is wider.
Reduces global warming.