Development of concrete expansion material using the surf clam shells of industrial waste

近年来，工业废物的有效利用已被提出。然而，渔业废物的利用远远落后。作者对海蛤的回收利用进行了研究。在以往的研究中，烧制蛤壳的砂浆是膨胀的。实验结果表明，普通砂浆的长度没有发生变化，而“掺烧蛤壳粉的替代砂浆”的长度却发生了很大的膨胀。导致其膨胀的因素是蛤粉中所含的氧化钙。CaO与H2O反应生成的氢氧化钙（Ca(OH)2）使砂浆膨胀。HP10（10%用蛤粉代替）起初膨胀后没有变化，认为是一天后蛤粉和水的反应结束。

Recently,effective use for industrial waste has been advanced. However,the use of fisheries waste is far behind. The author has been conducting a study on the recycle of surf clam.In the past researches,the mortar with burnt shells of surf clam expanded. As a result of the experiment,normal mortar did not change the length,but "alternative mortar mixed with burnt surf clam shell powder" turned to great expansion .The factor that caused it to expand is calcium oxide(CaO) included in clam powder. The mortar expanded due to calcium hydroxide(Ca(OH)2) derived by the reaction of CaO and H2O.HP10(10% replaced with clam powder) did not change after it expanded at first because it is thought that the reaction of clam powder and water finished after one day passed.