Abstract
The worldwide use and implementation of roller compacted concrete (RCC) is growing because of its good technical and economic advantages especially here in turkey. Chemical admixtures basically used for conventional concrete to increase its strength and produce a good quality concrete, and there are so many companies produce chemical admixtures for conventional concrete but only few companies produce chemical admixtures for roller compacted concrete (RCC). We were able to find the only company in turkey “Lyxor” to produce chemical admixtures for RCC; meanwhile this research aims to dictate the effectiveness of some chemical admixtures for roller compacted concrete (RCC) mixtures. We have conducted a test method to characterize some of the properties of RCC and these include the compressive strength and flexural strength with direct shear test. In this research we have used mainly 2 different types of chemical admixtures which include 3 types of superplasticizers which are Nanoment SP – Superplasticizers, Nanoment MR – Midrange Plasticizer, Nanoment HP – New Generation Superplasticizers, and the other type is Nano Aer – Air Entraining chemical admixture. We have conducted the test method by preparing 3 different RCC samples using each chemical admixture and tested them constantly within 3 and 28 days comparing them with 3 different None-admixed RCC samples which was prepared with the same procedure, and in the final we have prepared the test result table of each and every sample and the comparison chart as well. In the last part some recommendations and suggestions for the use of these chemical admixtures are mentioned.
Highlights
Introduction and Literature ReviewTransportation is an important part of history and has always played a major role in human gatherings and development of civilization
The accidental discovery of air entraining chemical admixture showed that this admixture is able to prevent freeze thaw damages in roller compacted concrete (RCC) mixture and it became the first chemical admixture to be used in RCC mixtures and the way was opened for the development of other kinds of chemical materials used in RCC and marketing of so many chemical admixtures [4]
With appropriate dosage use of superplasticizers in RCC water reduction of 12% can be achieved and 40% of increase in compressive strength will be gained by first day and flexural strength will be increased by 10% in 3 days
Summary
Transportation is an important part of history and has always played a major role in human gatherings and development of civilization. It’s been said that John Louden McAdam was the man who designed the first modern highways using inexpensive paving materials of soil and stone aggregates and he designed the roads a few feet higher than the surrounding areas to cause water to drain away from the surface [2]. Some believe that it was first used with Portland cement in 1879 in Scotland [3]. For many years concrete recipes contained only Portland cement, coarse and aggregates, sand and water. Companies were found, and chemical admixture industries came into begin. To determine the benefits of chemical admixtures on RCC, researches had been done and published, here we have summarized some of them
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