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混凝土為什么分強度等級?

混凝土為什么分強度等級?

分類(lèi)：公司新聞
作者：
來(lái)源：
發(fā)布時(shí)間：2020-08-06
訪(fǎng)問(wèn)量：0

【概要描述】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?！?

混凝土為什么分強度等級?

混凝土為什么分強度等級?

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混凝土為什么分強度等級?

【概要描述】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?！?

分類(lèi)：公司新聞
作者：
來(lái)源：
發(fā)布時(shí)間：2020-08-06
訪(fǎng)問(wèn)量：0

詳情

　　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。

　　根據有關(guān)標準的規定，建筑材料強度等級應以材料名稱(chēng)加上其強度標準值來(lái)表達。所以混凝土強度等級以符號C(英文混凝土Concrete的縮寫(xiě))及其后面的立方體抗壓強度標準值劃分為：C10，C15，C20，C25，C30，C35，C40，C45，C50，C55，C60，C65，C70，C75，C80。

　　因為一般工程上不同部位的商品混凝土所受的荷載不一樣，不能完全使用一種強度等級的混凝土。對于承受壓力大的部位，就要用***度等級商品混凝土，對于承受壓力小的部位，就要使用低強度等級的混凝土。因此，混凝土分為不同的強度等級，以適應不同工程的需要，通過(guò)設計計算選用。

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上一個(gè): 中國水泥行業(yè)整合發(fā)展已成為大勢所趨

下一個(gè): 混凝土為什么規定28d的強度為標準強度?

上一個(gè): 中國水泥行業(yè)整合發(fā)展已成為大勢所趨

下一個(gè): 混凝土為什么規定28d的強度為標準強度?

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2020-08-06

混凝土為什么分強度等級?

混凝土為什么分強度等級?

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>

2020-08-06

混凝土為什么規定28d的強度為標準強度?

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。

2020-08-06

為什么混凝土試塊以三塊為一組?

為什么混凝土試塊以三塊為一組?

混凝土試塊是衡量混凝土構件強度的標準，也是以試塊受壓***的強度，作為構件所能具有的強度。因此，除了試塊應按構件一樣制作外，試塊還必須有一定的數量。因為盡管我們盡量作到試塊的混凝土與構件的商品混凝土相同，但終究有一定的差別，如果單靠一個(gè)試塊來(lái)鑒定構件的強度，不具有說(shuō)服力。因此以三個(gè)一組，用三個(gè)試塊的強度平均值作為這一組試塊的強度(在特殊情況下需要去掉部分值)，也是以它定為構件的強度

2020-08-06

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