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08-06 

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

08-06 

關(guān)于混凝土砂率的知識

一、混凝土砂率定義：砂率是指混凝土中砂的質(zhì)量占砂、石總量的百分率。調整砂率的目的時(shí)使骨料的空隙率達到最小，從而使粘聚性、流動(dòng)性、保水性三者均衡。二、砂率對混凝土骨料的影響：在商品混凝土中，砂占骨料的百分比用砂率表示，砂率的變化會(huì )引起混凝土骨料的總比表面積和空隙的變化，從而對混凝土拌合物的和易性具有較大的影響?？偟膩?lái)說(shuō)，砂率變動(dòng)會(huì )引起骨料以下幾個(gè)方面的變動(dòng)?！　?.隨著(zhù)砂率的增加，粗骨料的用量減小，粗骨料總的空隙降低。一般來(lái)說(shuō)，在粗骨料在空隙率不變的情況下，粗骨料空隙的大小與粗骨料用量有關(guān)，粗骨料用量越大，粗骨料間的空隙也越大，需要填充的砂漿體積也就越多?！　?.砂率的變動(dòng)引起砂在骨料中的比例大小的變動(dòng)，隨著(zhù)砂率的增大，砂的數量增加，粗骨料數量減少。在商品混凝土中，粗骨料的空隙用砂來(lái)填充，隨著(zhù)砂率的增大，填充粗骨料空隙的砂的總的數量越來(lái)越大，填充越來(lái)越密實(shí)，砂石混合骨料空隙率也越來(lái)越小。當砂率增大到某一值時(shí)，粗骨料的空隙會(huì )達到最小值，再增加砂率，過(guò)多的砂會(huì )“擠開(kāi)”粗骨料，造成空隙增加。由此可見(jiàn)，混合骨料的空隙率隨著(zhù)砂率的增加先增大后減小?！　?.砂率的變動(dòng)會(huì )引起骨料的總比表面積發(fā)生變化。一般來(lái)說(shuō)，生產(chǎn)商品混凝土所用的粗細骨料的表觀(guān)密實(shí)相差不大，砂的平均粒徑小于粗骨料的平均粒徑。在質(zhì)量相同的情況下，砂的顆粒數量遠遠大于粗骨料顆粒的數量，因此，砂的比表面積要大于粗骨料的比表面積。在混凝土拌合物中，隨著(zhù)砂率的增加，骨料總的比表面積也隨之增加增加。在混凝土體系中，水和膠凝材料組成的漿體包裹在骨料的表面起潤滑作用，骨料的比表面積越小，包裹在表面的漿體越厚，骨料間的摩擦力越小，混凝土的工作性也越好，反之亦然。

08-06 

混凝土基本知識，快來(lái)看看

普通混凝土是以水泥為膠凝材料，用砂、石作為細、粗骨料，加水拌和按一定比例攪拌而成的拌合物。在整個(gè)混凝土家族中，普通混凝土使用最早，用途最廣，今天鄭州混凝土廠(chǎng)家恒基建安砼站為砼友帶來(lái)幾點(diǎn)相關(guān)基礎知識，供砼友們學(xué)習：

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