载在《道路建筑材料试验指导书》人民交通出版社,P55-P56。版权归人民交通出版社所有。NU
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粉煤灰烧失量试验NU
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(GB/T 176-96)NU
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(一)、目的与适用范围NU
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测定粉煤灰的含炭量,粉煤灰中的含炭量过多会影响其活性、对混合料强度有明显影响。NU
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(二)、仪器设备NU
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1、天平:不应低于四级,精度至0.0001g。NU
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2、铂、银或瓷坩埚:带盖,容量15~30ml。NU
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3、马弗炉:隔焰加热炉,在炉膛外围进行电阻加热。应使用温度控制器,准确控制炉温,并定期进行校验。NU
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(三)、试验步骤:NU
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1、先称取空瓷坩埚的质量m0,然后称取粉煤灰试样约1g(m1),精确至0.0001g,然后将粉煤灰置于已灼烧恒量的瓷坩埚内,将盖斜置于坩埚上。NU
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2、将瓷坩埚放在马弗炉内,然后从低温开始逐渐升高温度,在800~950℃下灼烧15~20min。NU
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3、将瓷坩埚取出置于干燥器中冷却至室温,称量。反复灼烧,直至恒量(见恒重说明)(m2)。NU
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恒重说明:经第一次灼烧、冷却、称量后,通过连续对每次15min的灼烧,然后用冷却、称量的方法来检查恒定质量,当连续两次称量之差小于0.0005g时,即达到恒重。NU
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(四)结果整理NU
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粉煤灰烧失量的质量百分数XLOI按下式计算,准确至0.1%.NU
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XLOI=((m1-(m2-m0))×100/m1NU
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式中:XLOI----粉煤灰烧失量的质量百分数,%;NU
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m0---空瓷坩埚的质量,g;NU
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m1----粉煤灰试样的质量,g;NU
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m2----灼烧后粉煤灰试样和瓷坩埚的合重,g。NU
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取样方法和评定标准见GB 1596-2005NU
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Word版本:[upload=doc]viewFile.asp?ID=4440[/upload]
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