第61章 【原始水泥】
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魏延后来也试着弄了一些混凝土,跟三合土作比较。
三合土和混凝土在硬度上相比,刚开始混凝土要硬一点,混凝土一般3小时就能达到初凝,3天就能凝结;而三合土不一样,早期只能通过人为拍打夯实,达到塑形和变硬的目的,但放置时间久了,石灰和黄土、空气中的二氧化碳等反应会石化,如果混凝土不加钢筋的话,三合土的硬度、耐久性比混凝土强。
魏延还做了个实验,拿起一把铁锤,几锤子抡下去,三合土却没有裂开,只留下一些凹陷;可同等力度下,没有钢筋的混凝土,已经被敲得四分五裂。
魏延明白,混凝土,没有塑性,就是变形能力,一般一敲,就容易断裂。
这也是那些城墙屹立千年而不倒,而现代很多建筑几十年就垮掉的一个原因。
随后,魏延又提出一个关键的要求:“在夯土内外要包裹青砖,筑成砖城。”
李严有些不解:“主公,我们修筑的仅仅是一个新县城,有必要做砖城吗,现在很多郡城还是土城呢。”
魏延严肃地说道:“砖城更坚固耐久,风吹雨淋水浸泡都没太大问题,如果想一劳永逸,日后不必花费太多的时间去修缮城墙,那就做成砖城,另外,砖城在防御投石机、冲车等攻城器械上更有优势。这是我们未来的根本,不可轻忽。”
李严领悟,不过他提出:“主公,三合夯土作为城墙的主体,要先行制作,先行修葺,如果张绣大军来的早,至少有个土城挡一下。”
魏延点点头:“好,在土城修筑完了以后,再在两边包裹大青砖不迟!”
这个时候,作为粘合剂的水泥,应运而生。
原来修筑砖城是有粘合剂的,是把一种草加水加温成粘液,再配以适量的石灰、细沙,搅拌成混合浆而制成的,但是,它的承压能力比水泥沙浆低。
魏延更倾向于把水泥发明出来。
但他上一世没接触过水泥生产,看历史小说的时候,看到制作水泥的桥段,都是一目十行飞掠过去,根本没想过自己有天也会穿越,根本没记那些水泥的配方和生产工艺,更加不知道怎么把现代水泥工艺跟三国时代的实际情况结合起来,只得求教种子神器精灵空空。
因为对于种子神器而言,万物皆有种,水泥这种东西也不例外,包括适合于三国时代的原始水泥制作工艺,也是一个种子,需要魏延用50000积分兑换。
实在太贵了,但魏延实在没辙,只能用50000积分去兑换。
随后,魏延手里出现一张纸,上面详细地写了原始水泥的原料、配方、生产工艺。
他气得手直哆嗦:“一张薄薄的纸竟然要我50000积分,空空你太黑了!”
空空傲娇地说道:“谁让你以前看历史小说不认真呢,一目十行,遇到技术描述就跳过,现在活该!”
魏延无语,赶紧让人抄录几份,省得那份丢了,再被空空讹诈。
他把那张纸交给李严,让他安排人手按照上面的去做制作水泥。
……
此,数百里外的穰城,贾诩已经命人做出大肆收购匈奴马的假象,并且暗地里打造攻城设施。
南阳郡里,已然有山雨欲来的征兆。
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