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target="_self"><strong>珊瑚砂</strong></a>由于含堿性物質，經過其過濾的pH值一般為7.0～8.5，不斷釋放的鈣離子、鎂離子能為海水生物生存提供較高的硬度和穩定的酸堿度，因而適合用于養殖海水魚的海水過濾系統中。使用8－16個月后需要更換。由于含豐富的孔隙結構，還可作為生物過濾系統的載體，大量培養硝化細菌。屬海洋天然濾材，***大的特點是微孔豐富，適宜大量的生化細菌生存，可作為下（內）層鋪設濾材。 </p><p>利用<a href="http://www.gxyouxi.com" target="_self"><strong>珊瑚砂</strong></a>取代天然河砂進行混凝土的配合比設計，系統研究了珊瑚砂混凝土的抗折強度、抗壓強度、劈裂抗拉強度、干燥收縮以及早期抗開裂性能，同時用相同配合比參數的河砂混凝土進行對比。此外，還對珊瑚砂混凝土的抗氯離子滲透性、抗碳化性等耐久性以及水化產物的微觀結構進行了分析。試驗結果表明，珊瑚砂混凝土的抗壓強度要低于河砂混凝土，而抗折強度、劈裂抗拉強度則相差不大；珊瑚砂混凝土的干燥收縮性能、早期抗開裂性能、抗氯離子滲透性以及抗碳化性均要好于河砂混凝土。珊瑚砂由于其凸凹多孔，使得其界面過渡區的黏結力要大于河砂混凝土，這極大改善了其界面的結構性能。 </p><p>珊瑚是珊瑚蟲分泌出的一種有機石灰質方解石。珊瑚蟲是一種海筒狀腔腸動物，幼蟲階段的珊瑚蟲是白色的，它們依附在已化為珊瑚石的祖輩遺骨堆上依靠觸手捕捉食物，為了能更多地捕捉食物和吸收陽光，珊瑚蟲便向上生長，還向前后左右不斷擴展從而形成樹枝狀的生物群體，并不斷分泌出石灰質方解石形成自己的軀殼，就是這樣一代代的堆積而成巨大的珊瑚石。珊瑚是珊瑚蟲分泌出的一種有機石灰質方解石。珊瑚蟲是一種海筒狀腔腸動物，幼蟲階段的珊瑚蟲是白色的，它們依附在已化為珊瑚石的祖輩遺骨堆上依靠觸手捕捉食物，為了能更多地捕捉食物和吸收陽光，珊瑚蟲便向上生長，還向前后左右不斷擴展從而形成樹枝狀的生物群體，并不斷分泌出石灰質方解石形成自己的軀殼，就是這樣一代代的堆積而成巨大的珊瑚石。</p><p><br/></p></p> <hr /> <p> <a 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