Laboratory Studies on Cold Bituminous Mixes with NanoTac Additive and its Effect on Curing Time

Ashish C. Biradarpatil*, Jaya R.S**
* Postgraduate, RASTA – Center for Road Technology, Bangalore, India.
** Assistant Professor, RASTA – Center for Road Technology, Bangalore, India.
Periodicity:June - August'2017
DOI : https://doi.org/10.26634/jce.7.3.13609

Abstract

Research and application of hot mix is being done on a large scale across the world. In a country like India, Cold mix technology is lagging behind in both research and application fields which is quite observable. In cold mix technology, there is no heating of the aggregates and bitumen which are the prime reason for the environmental pollution as in case of the hot mix technology. Besides environmental problem, cold mix technology is economical as the heating cost of aggregates and bitumen is saved.

The cold mix can be produced using the same hot mix plant. Different agencies and researchers have developed different mix design procedures for cold mixtures with a little change in each of them. The main objective of the present work is to improve the properties of cold mix. For preparation of the mixes, aggregate gradation has been taken as per MORTH specification for BC – 2, emulsion content has been varied regularly from 7% to 10% for dense graded mixes. In the present study, a conventional cold mix Bituminous Concrete (BC) is designed as per asphalt institute manual and is compared with the cold mix bituminous concrete which is prepared with different dosages of liquid additive. The additive is varied in three dosages of 0.2%, 0.4%, and 0.6% and it is added to the bitumen emulsion prior, to mix with the aggregates and mixed with a mechanical mixer for 10 min. For each dosage, optimum residual bitumen content is found out separately by varying emulsion content. From the Optimum Residual Bitumen Content (ORAC), the specimens were made to check the indirect tensile stiffness test at three different curing conditions of, one day curing at 25 oC, seven days curing at 25 oC and 40 oC to check the rate of gain in strength of cold mixes. From the results obtained from the indirect tensile strength after adding the additive, there was a notable increase in one day strength.

Keywords

Cold Mix Technology, Indirect Tensile Strength, NanoTac Additive, Marshal Mix Design, Pre-Wetting Water Content

How to Cite this Article?

Biradarpatil, A.C., and Jaya, R.S. (2017). Laboratory Studies on Cold Bituminous Mixes with NanoTac Additive and its Effect on Curing Time. i-manager’s Journal on Civil Engineering, 7(3), 41-48. https://doi.org/10.26634/jce.7.3.13609

References

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