硅酸盐水泥熟料的主要矿物组成有哪些?它们加水后各表现出什么性质
推荐回答(2个)
硅酸盐水泥主要有4种矿物成分:硅酸三钙(c3s),硅酸二钙(c2s),铝酸三钙(c3a),铁铝酸四钙(c4af)。四种矿物对水泥性质的影响也不一样,1)
c3s:是硅酸盐水泥熟料中最重要的矿物,含量占熟料的50%以上,c3s加水调和后,凝结时间正常,水化较快,早期强度高,因此强度增进率较大。其28天强度、一年强度是4种矿物最高的,它的体积干缩性较小,抗冻性较好。因此一般希望熟料中有较多的c3s。2)
c2s:与水作用时,水化速度较慢,早期强度低,但28天以后强度仍能较快增长,一年后可接近c3s。它的水化热较低,体积干缩性小,抗水性和抗硫酸盐侵蚀能力较强。c3s和c2s通称为硅酸盐矿物,它们是熟料中的主要成分,占熟料的70%以上,也是熟料强度的主要来源,硅酸盐水泥的名称也由此而来。3)
c3a:与水结合后,水化迅速,凝结硬化较快,如果不加石膏等缓凝剂,易使水泥急凝。它的早期强度较高,后期强度增长较少,甚至倒缩。它的水化热较高,干缩变形较大,抗硫酸盐侵蚀和抗碱性都较差,它的脆性、耐磨性较差。4)
c4af:水化硬化速度较快,早期强度较高,仅次于c3a。与c3a不同的是它的后期强度也较高,类似于c2s。它的水化热较低,干缩变形小,耐磨,抗冲击,抗硫酸盐侵蚀能力强。c3a和c4af以及熟料中组成不定的玻璃体和含碱化合物等,填充在c3s和c2s之间,统称为中间相。中间相在熟料煅烧至一定温度熔融成液相。液相是反应生成c3s的必要条件,一定的液相量和较低的液相粘度是形成主要矿物c3s不可缺少的。因此,一般情况下,c3a和c4af必须有一定的数量,从而保证一定的液相量。此外,水泥在生产过程中还要掺加一定量的混合材,对水泥性能也产生影响,所以水泥也分为好多种类和强度等级。
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硅酸盐不泥熟料的主要矿物成分有:硅酸三钙C3S、硅酸二钙C2S、铝酸三钙C3A,和铁铝酸四钙C4AF.
这些矿物成分对水泥性质如下:
C3S
C2S
C3A
C4AF
凝结硬化速度
快
慢
最快
28天水化热
大
小
最大
中
强度
高
早期低
后期高
低
耐腐蚀性
差
强
最差
中
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