PROPERTIES OF WATER-RETENTIVE INTERLOCKING CONCRETE BLOCK MIXING WITH BLENDED VOLCANIC ASHES FROM MT. SHINMOEDAKE AND MT. SAKURAJIMA VOLCANOS IN SOUTH KYUSYU

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  • 南九州における新燃岳と桜島の火山灰を混合配合した保水性インターロッキングブロックの特性

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The utilization of volcanic ashes from Mt. Shinmoedake（T）and Mt. Sakurajima（S）volcanos in South Kyushu, Japan was studied to use the water-retentive interlocking concrete block（WRILB）to grasp a maximum mixing volume rate of both ashes. Firstly, both ashes were confirmed to be able to mix into WRILB from the ASR test’s results although containing ASR properties in both ashes by a XRD analyzing. Secondary, the experiment was done to compare the bending strength, the height absorbed water and the capacity of water-retention, as the JIS standard for the WRILB, after producing 10-type-WRILB without volcanic ash and with 9 combined ashes by 3-volume ratio blended T and S, i.e. 3：7, 5：5 and 7：3, and 3-volume rate of 20, 30 and 40％ mixing as fine aggregate. As the result, the maximum mixing volume rate of volcanic ashes for WRILB was recommended 30％ with 5：5（T：S）volume ratio as blending both ashes, while thinking about the reduction of volume of volcanic ash accumulation.

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