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The local and central governments of Taiwan have been spending a great deal of budget and resource on emergency relief and infrastructure recovery due to increasing occurrence of typhone and severe storm in many areas especially in mountain and along major rivers where landslide and flood are frequent natural hazards in the region. The study was conducted to investigate the feasibility of using the weathered-rock debris soils from landslide along several rivers in the Nantou area as recycled aggregate material for making concrete products that are the most common material for construction in Taiwan.
A series of laboratory tests for water/cement ratio of 1.5,1, 0.5 were designed and conducted to investigate concrete properties including physical properties and compression strength of the concrete specimen cylinder at 3, 7 and 28 days after pouring. In addition, the laboratory tests also include workability/slump test and abrasion test from which the results were studied and compared with that of standard concrete specimen using ordinary aggregate in the industry to better understand the possible application of the studied landslide debris soils for some specific construction purposes, especially in remote areas.
The results of the study revealed that the concrete specimens using the recycled aggregate have a 28-day compression strength ranging from 31 kg/cm2 to 194 kg/cm2, about 11% to 66% of the ordinary standard concrete. In general, the study results preliminarily conclude that the concrete using the weathered-rock debris soils from landslide can be used for construction projects such as secondary structural element, controlled low strength material (CLSM), gravity-type retaining wall, rigid pavement in farm field, and some industrial passage with a width less than 3 meters. The results of the study provide useful information not only for better use of the studied recycled construction material but also for reducing the cost of cleaning landslide debris along rivers due to natural hazards in central Taiwan.
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