Mangangka, Isri R.
(2017)
The use of Local Aggregate for Eco-Drainage Component, Rigid Porous Pavement.
In: Annual International Conference on Engineering 2017, Manado.
Abstract
Implementation of environmentally friendly drainage system (eco-drainage) is an effort to reduce the environmental quality degradation, including quality and quantity of runoff. With eco-drainage concepts, stormwater management is not only focused on runoff quantity, but more integrated in quantity and quality management with additional objectives of amenity, landscapes and aesthetics, water conservation and ecological restoration.
The eco-drainage concept is implemented through three methods: detention system, retention system and infiltration system. The use of "porous pavement" in light-load road construction is one method of infiltration systems. Porous pavement as an alternative to conventional impermeable pavement has many advantages in terms of rainwater management. The porous pavement surface causes stormwater infiltrates and percolates into the base course and sub-base of the road and then to sub-grade. The advantages of porous pavement is to reduce peak discharge, improve groundwater refill and improve the quality of surface water (runoff).
To increase the carrying capacity of porous pavement construction, pore size and quantity must be reduced, on the other hand to increase infiltration capacity, the size and quantity of pore should be increased. This study aims to produce aggregate compositions on concrete mixtures for rigid porous pavement construction, which is strong enough with adequate infiltration capacity. The optimal aggregate composition was obtained through laboratory experiments based on several mixed concrete design compositions. Samples were made according to different aggregate compositions, then tested their strength (carrying capacity) and their infiltration capacity. The best aggregate composition is obtained by sample that has adequate strength to support vehicle load and also has sufficient infiltration capacity.
Rigid porous pavement construction design is expected to be applied to road construction with light load as an eco-drainage component. In order to have economic value, this research utilize local aggregate with previously prepared for different gradations. This study used two aggregate types based on the source of the collection, aggregates from Kinilow, Tomohon City (Kinilow Aggregates) and aggregates from Lansot, North Minahasa Regency (Lansot Aggregates).
In addition to obtaining an optimal combination of the strength of this rigid porous pavement construction and infiltration capacity, this study also aims to determine the relationship between this combination with the aggregate properties. This relationship is obtained through statistical analysis of multivariate analysis.
The results of statistical analysis indicate a relationship between the strength of the construction and the properties the aggregate. The results show the same trend of relationship between carrying capacity and infiltration rate for samples from both Kinilow Aggregates and Lansot Aggregates. However, the study results also show the differences of the construction strength and the infiltration capacity and their correlation to the properties of the aggregates. The results also show that both local aggregates are very suitable to be used for construction material of porous concrete pavement. Samples with minimum aggregate size of 2.36 mm still have more than enough infiltration capacity to infiltrate runoff from high intensity rainfall with 5 minutes duration for 10 years and 20 years return period design rainfall. Furthermore, Samples with minimum aggregate size of 9.525 mm, which have very big infiltration capacity, still have adequate carrying capacity to be used for street pavement.
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