Utilization of Bantak and Merapi Volcanic Ash for Porous Paving Block as Drainage Control in the Prambanan Temple Yard

A novel solution for drainage control at the Prambanan Temple Compounds involves the use of porous paving blocks made from volcanic materials, specifically bantak and Merapi volcanic ash. These blocks, with an optimal mixture containing 30% volcanic ash, demonstrate superior permeability compared to traditional paving blocks and soil, with a coefficient of 1.93 cm/s—8 times faster than normal blocks and 18 times faster than the temple's current soil. This innovation effectively eliminates ponding during rainfall, reducing runoff levels by up to 81.6% and preventing water accumulation entirely due to their permeability exceeding local rainfall intensity (1.5×10⁻³ cm/s). Additionally, these blocks exhibit a strength capacity of 6.05 MPa, supporting forklift loads up to 9 tons, ensuring durability in high-traffic areas.

Rifa’i, A. (2017). UTILIZATION OF BANTAK AND MERAPI VOLCANIC ASH FOR POROUS PAVING BLOCK AS DRAINAGE CONTROL IN THE PRAMBANAN TEMPLE YARD. International Journal of GEOMATE, 12(31). https://doi.org/10.21660/2017.31.70607