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得到了推进。然而，渔业废弃物的利用远远落后。笔者一直在进行网壳回收利用的研究，在以往的研究中，网壳烧焦的网壳砂浆都是膨胀的。试验的结果是，普通砂浆没有改变长度，但掺入烧焦贝壳粉的替代砂浆发生了很大的膨胀，导致其膨胀的因素是蛤粉中含有的氧化钙(CaO)。由于CaO和H_2O反应生成的氢氧化钙(Ca(OH)_2)导致砂浆膨胀，HP10(用文蛤粉替代10%)最初膨胀后没有变化，因为人们认为文蛤粉和水的反应在一天后就结束了。

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.