Cold Mix Essay

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COLD MIX TECHNOLOGY
5.1. Cold mix Technology
Cold mix can be defined as a bituminous mixture which contains mineral aggregate, water and binder (i.e. bitumen emulsion) prepared by a suitable device like cold mix plant, concrete mixer or a modified hot mix plant.
Cold emulsion mixes are classified by their use, composition and storability. They are basic aggregate-asphalt emulsion mixes. To determine the grade and percent of emulsion used, as well as the workability, stability, strength and moisture susceptibility mix designs are required. Mixes are designed for purpose (construction) and climate.
5.2. Design of cold mix
Parameters like, source of aggregate, curing condition and curing time etc. varies the properties of cold mixes. As a result of which no universally accepted mix design method for cold mixes are there for these reason. But Marshall Method is popularly used to design emulsified mixes and is based on the research conducted at the University of Illinois. This method is applicable for low volume traffic load to base course mixture. For low to medium traffic volume road Cold mix is used in surface course also. Procedure for the cold mix design
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For example, coating test will be started using slow setting emulsion at about 3 percent added water. When aggregate is mixed with water sixty seconds of mixing time is sufficient. Bitumen emulsion is added afterwards and then mixed for about 1 minute until even coating is obtained. With an additional increment of 1 percent water by weight of dry aggregate new batch will be prepared. Coating of aggregate in excess of 50 percent shall be considered acceptable. The best bitumen coating on the mineral aggregate is the optimum pre-wetting water contentment and this optimum water content will be mixed in all subsequent

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