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08-06 

中國水泥行業(yè)整合發(fā)展已成為大勢所趨

籌劃重組的天山股份，復牌后股價(jià)在上周上演了“過(guò)山車(chē)”走勢。復牌首日，即8月10日其股價(jià)一字漲停;隨后的8月11日、8月12日，再連獲兩個(gè)漲停板;8月13日開(kāi)始回調;8月14日，跌幅擴大至9.38%，逼近跌停。根據重組方案，天山股份若成功整合中國建材旗下的水泥資產(chǎn)，將超過(guò)海螺水泥成為行業(yè)新龍頭。

08-06 

首先應當知道混凝土強度等級是什么?；炷翉姸鹊燃壥歉鶕炷亮⒎襟w抗壓強度值人為劃分出來(lái)的，它是混凝土的特征強度。根據現行有關(guān)標準、規范規定混凝土立方體抗壓強度是按標準方法制作的邊長(cháng)為150㎜的標準尺寸的立方體試件，與ISO試驗方法一致的溫度為20士2℃,濕度為95%以上的標準養護室，養護***28d齡期，按標準試驗方法測得的混凝土立方體抗壓強度?！?/article>

08-06 

混凝土為什么規定28d的強度為標準強度?

混凝土是靠水泥的膠結作用，逐漸硬化，而抗壓強度的。由于水泥的結硬不是一下子就完成，而是隨著(zhù)時(shí)間的增加而變化的。在正常的養護條件下，前七天抗壓強度增長(cháng)較快，7d~14d之間增長(cháng)稍慢，而28d以后，強度增長(cháng)更是比較緩慢。因此28d以后抗壓強度為標準強度，作為設計和施工檢驗質(zhì)量的標準。顯然，如果以小于28d的強度作為標準強度，則商品混凝土的性能不能充分發(fā)揮。如果以大于28d的強度作為標準強度，雖然混凝土的性能可以充分發(fā)揮，但由于達到標準強度的時(shí)間過(guò)長(cháng)，影響了施工進(jìn)度。

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