A basic study on the development of interlocking concrete block using Shinmoedake volcanic ash for an environmental improvement

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The volcanic ash, from Shinmoedake erupted in the last of January, 2011, kept high absorption as concrete aggregate. The experiment was done to clear the upper limit volume rate of mixing with the ash into the retentive interlocking concrete block for an environmental improvement, comparing with Sakurajima's volcanic ash. The rate indicating the bending strength of above 3.0 MPa was 30% for Shibnmoedake's ash and 20% for Sakurajima's ash respectively, and increasing Sakurajima's ash led to make the bending strength small and the retentive rate large because of its fine ash. Furthermore, using ash of 3:7, 5:5, and 7:3 of blending volume rate with the former ash vs the latter one in the ash-mixing volume rate of 20, 30, and 40% was tested. The 5:5 blending volume rate in 30% ash-mixing volume rate was recommended to keep enough bending stress and required block functions for retentive interlocking concrete block.