第22章 水泥

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凭着脑海中关于土法炼水泥的记忆,尝试配比。
    石灰石、黏土、铁矿石粉末,按照三比一比一的比例混合,入窑煅烧。
    没有温度计,只能靠经验判断火候。
    木柴烧出来的温度不够,卫昭就让人把木柴先烧成木炭,再用风箱鼓风,温度勉强能到。
    第一炉出来,灰褐色的块状物,敲碎了用水一和,凝固速度不错。但强度不够,用力一掰就碎。
    唐岁蹲在旁边,捏着一块凝结物,表情复杂。
    “卫哥,这跟石灰有什么区别?”
    “这不是石灰。这是土水泥。”
    “土……什么?”
    卫昭没急着解释,又调了一炉,这次把铁矿石粉的比例提高了一成,煅烧时间延长了一个时辰。
    出窑后,用石头碾子磨成细粉,再用细筛筛了三遍。
    和上水,混入沙石,制成泥浆,抹在寨墙上一段做了个试验。
    第二天一早,唐岁去检查那面墙,用石头狠狠砸了几下,只砸出几个白印子。
    他眼睛刷地就亮了。
    “卫哥!这玩意儿好硬!”
    卫昭早就知道这结果,甚至还有点遗憾。
    他要是能找到高炉,加温到一千四某度以上,那出来的才是真正的波特兰水泥。
    眼下的土水泥,也就勉强能用的水平。
    但在这种边关小寨,已经足够了。
    接下来的几天,寨子里所有人全部投入修墙工事。
    他们先在寨墙外侧加筑一层土水泥混合沙石的护墙,厚达一尺。
    墙根处,每隔三尺打入一根三尺深的尖木桩,入土部分用水泥浇灌固定,形成一道路障。
    寨门做了双层加固,门洞内加装了闸板,一旦门被撞开,里面还有第二道防线。
    墙头上的弓箭射击位也重新做了布置。
    每隔十步一个垛口,下面垫了土台,弓手站上去刚好露出半个脑袋。
    短短七天,鸡鸣堡寨焕然一新。
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