Abstract
Concrete railway sleeper has been used in Indonesia since about 1990�s. It has more advantage that is less maintenance, stabile, good quality, shapeable, onsite raw material, and higher loading ability [9-10, 20 - 22]. But It is prone to damage such as cracking and breaking during construction, so it is often thrown away as a solid waste that can contaminate the land and reduce soil fertility. Therefore, it should be utilized in order to be more useful that is used as recycle aggregate. The concrete waste that is taken from broken concrete railway sleeper will be crush as an aggregate as raw material in the concrete to substitute part or all of the normal concrete. It is called recycled aggregate and concrete that is made from recycled aggregate is called recycled concrete. Base on the testing of raw material, the recycled aggregate can be met to the specification as ASTM [1], so it can be used for concrete raw material. Recycled concrete compressive strength result lower the normal concrete compressive strength in the same initial strength design. The strength value of recycled concrete is decrease about 1 � 17% for 25 MPa and 10 � 18% for 30 MPa. It is also happened to tensile strength of recycled concrete that decrease about 2 � 13 % for 25 MPa and 7 � 22 % for 30 MPa.
Highlights
In Indonesia, the railway was designed by Netherland government as a colonialist, but the realization of construction was built since 1864 in Java that is Solo-Yogyakarta [19 – 21, 24]
The test result all aggregates can be used for raw material of concrete, because they meet to ASTM specification that a standard of concrete no exception for recycled aggregate
Note:Normal coarse aggregate content in the recycled concrete is depend on percentage of recycled aggregate content
Summary
In Indonesia, the railway was designed by Netherland government as a colonialist, but the realization of construction was built since 1864 in Java that is Solo-Yogyakarta [19 – 21, 24]. The steel price has very expensive, so the railway construction will become high price Base on the both problems they are wood scarcity and steel rail high price sleeper material, the alternative railway sleeper material must be found the solution. The precast concrete railway sleeper that has produced in workshop will be mobilized to site by truck or trailer transportation It will be loading and unloading by crane or other lifting equipment that compatible in the field conditions. The concrete solid waste is only land fill that is not economical Base on the both problems, the concrete waste that takes rom damaging precast concrete railway sleeper will be used for aggregate in the concrete. The implication of this research is a reduce and increasing economic value the solid waste (concrete waste)
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