第7章水泥破壁:雪魄预警先遣袭

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    第7章水泥破壁:雪魄预警先遣袭(第1/2页)
    石灰石源源不断地运回寨子,阿铁带着人按照向拯民给的图样,也在寨子东南角靠近水源的空地上,成功垒起了三座馒头状的土窑。窑体用粘土混合茅草夯筑而成,看上去敦实厚重。
    接下来,就是最关键的一步——烧制石灰。
    向拯民指挥着寨民们将大块的石灰石和干柴交替着填入窑内,直到填满,然后封住窑顶,只留几个透气孔,最后在底部的火膛点燃了熊熊烈火。
    “大火连续烧三天三夜,不能停!”向拯民对负责看守火窑的岩生等人再三叮嘱,“火候是关键,直接关系到石灰的质量。”
    烈焰升腾,热浪扑面。三座土窑像三个巨大的火炉,日夜不停地吞吐着火焰,映得半边天都泛着红光。寨民们轮流值守,添柴加火,不敢有丝毫懈怠。空气中弥漫着烟火气和一种石头被灼烧的独特气味。
    所有人都眼巴巴地望着这几座土窑,心里既期待又忐忑。向大哥说的那种神奇“水泥”,真能从这烈火中诞生吗?
    三天后,熄火,等待窑体自然冷却。
    当向拯民带着人,小心翼翼地扒开尚有余温的窑顶时,所有人都屏住了呼吸。窑内,原本青灰色的石灰石,果然变成了雪白色的块状物,质地酥松,用手一捏就能碎开。
    “成了!这就是生石灰!”向拯民拿起一块,脸上露出了如释重负的笑容。
    “这就是石灰?”阿铁好奇地拿起一块,左看右看,“这不还是石头吗?只不过颜色变了。”
    “别急。”向拯民让人取来一桶水,然后用木棍夹起一小块生石灰,缓缓浸入水中。
    “嗤——!”
    一股白汽猛地从水桶里窜起,伴随着剧烈的沸腾声!那块生石灰在水中翻滚、膨胀,最后竟自行碎裂、解体,化成了一桶浑浊的白色浆糊状物体!
    “这……石头化了!真的化了!”围观的寨民们发出一片惊呼,眼珠子都快瞪出来了。这景象在他们看来,简直如同法术!
    “这不是化,这叫‘消化’。”向拯民用木棍搅动着桶里的石灰浆,“现在它变成了熟石灰,也就是我们要用的石灰膏。”
    他接着解释道,单用石灰膏,凝固后强度不够,还需要混合粘土和细沙。他指挥着寨民们将石灰膏、筛好的粘土粉和干净的细沙,按照大概“三份石灰,一份粘土,六份细沙”的比例(这是他根据记忆和现场材料调整的大致配比)混合在一起,加水反复搅拌、捶打,直到成为一种粘稠均匀的灰褐色泥浆。
    “向大哥,这……这泥巴真能筑墙?”覃家寨派来学习的一个年轻工匠忍不住质疑道,他叫石根,是覃家寨手艺最好的泥瓦匠的儿子,“我们祖辈都是用黄泥掺稻草,或者直接用石头垒,这粉末子加水,能结实吗?”
    不仅是他,很多巴寨的人心里也在打鼓。这看起来和普通泥巴没啥区别的东西,能挡住唐崖的刀枪?
    向拯民知道,空口无凭,必须用事实说话。他早就让人用木板做了几个一尺见方的木框模子。他亲自动手,将搅拌好的水泥砂浆倒入木框里,用木板抹平表面。
    “大家看好,这是今天刚和的料。”向拯民指着那几个木框,“我们等上一天,最多两天,看看它会变成什么样。”
    等待是煎熬的。所有人的心都悬在那几个不起眼的木框上。
    第二天下午,好奇的人们就围了过来。向拯民在众人的注视下,拆掉了一个木框。里面的水泥已经凝固成了灰白色的硬块,表面粗糙,但摸上去硬邦邦的。
    “岩生,你来,用力砸一下试试。”向拯民对力气最大的岩生说道。
    岩生搓了搓手,抡起旁边准备好的大木槌,嘿呦一声,用力砸了下去!
    “砰!”
    一声闷响。木槌被弹了起来,那块水泥块只是被砸掉了一个小角,主体纹丝不动,甚至连裂纹都没有几条!
    “我的娘诶!”岩生看着手里震得发麻的虎口,又看看那块坚硬的水泥,嘴巴张得能塞进一个鸡蛋。
    围观的人群瞬间炸开了锅!
    “这么硬?!”
    “这比一般的石头还结实啊!”
    “神了!真是神了!”
    石根和那几个覃家寨的工匠更是扑到近前,用手摸着、敲打着那块水泥,脸上全是难以置信的震撼。他们是行家,太清楚这意味着什么了!如果用它来筑墙,那该是何等坚固!
    疑虑瞬间烟消云散,取而代之的是狂喜和无穷的动力!
    “快!快和料!”
    “趁着天气好,赶紧筑墙!”
    “对!把寨墙都换成这个!”
    不用向拯民再多说,所有人都像打了鸡血一样,投入到热火朝天的筑墙工作中。男人们负责搅拌水泥砂浆、搬运石块(向拯民采用了石砌内核,水泥抹面加固的结构,更节省材料和时间),
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