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第61章 【原始水泥】

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这个时代的筑城技术远没有明清时代发达,大部分城池都是土城,就像那个荆州城(不是襄阳,是江陵)原来在东汉时期也是土城,一直到南宋时期,才开始建砖城。龙腾小说网ltxs520.com

后世考古记载,历史上关羽在荆州镇守十年,修缮城墙,用的是灰黑色黏土和黄褐色沙土,夯土,逐层夯筑,夯层厚,夯窝呈圆形。

对魏延而言,那样的筑城技术实在太过落后,别说土城根本承受不起后来的投石车、霹雳车了,光是雨淋和水浸,就要花费大量的人力物力去修缮,也难怪关羽在荆州镇守十年花费了大量时间去修缮城墙。

从这个义阳新城开始,魏延要给这个时代树立一个筑城的榜样。

不过,他只有理念,上一世他只是一个初级技术人员,缺乏调配人手统管整个大项目的经验,这一世,他家的坞堡也只是夯土而建,不是砖城,他需要一个能够统管这个大项目的人才。

现在他身边只有邓芝一个政治大才,便问邓芝,能不能肩负起这个重任。

邓芝笑道:“主公,属下从未有过筑城经验,但李严李正方却曾负责宛城城池的修缮,他应能担当此等重任。”

魏延猛然想起,李严在犍为太守上,凿通天社山,修筑沿江大道,大兴土木,把郡城整修一新,以致“吏民悦之……观楼壮丽,为一州胜宇”。此人善于建筑,又有筑城经验,行事作风又雷厉风行,绝对能担当此等重任。

魏延连忙让邓芝前去换回李严,由邓芝暂代平春县尉,而李严为义阳县丞,主要负责义阳新城修筑。

邓芝刚出魏家坞堡,便在门外遇到了李严。

原来李严也想到这个问题,行不数里,便打道回府,特来请缨。

“真乃英雄所见略同!”李严和邓芝两人相视一笑,交接事宜。

李严担负起筑城重任,统御十余万军民修筑新城。

魏延跟他交代了一些要求:“首先,夯土用三合土。”

这里重点强调一点,三合土绝对绝对不是砌砖用的粘合剂,而是一种夯土。

三国时期还没有出现三合土,一直到东晋时期,才在普通夯土里添加一定数量的沙和石灰,以此形成的三合土,比普通夯土更为坚实,达到刀锥不入的地步。

夯土两边包砖这个放在后面说。

有人问为什么不用混凝土,原因很简单,目前水泥还没出来,就是出来了,以这个时候的产量,顶多够粘合砖石,根本不足以弄出城墙的主体,再说成本上也是问题。

李严一脸诧异:“主公,何为三合土?”

魏延让人找来一些石灰、黄土、沙石,按照六三一的比例混在一起,然后掺入一点桐油,桐油主要是起黏合作用,相当于混凝土里面的水泥浆。

把这些材料搅拌完了,然后堆在一个正方形的模子里,再命人用木槌反复地敲,要拍到表面光滑为止,这敲打动作十分关键,能起到凝结固化的作用。

敲敲打打小半个时辰后,一盒硬邦邦的干沙石竟然敲出水来,变成一整块黄黄的泥土。

魏延跟李严说道:“这种三合土,敲打次数越多,放置时间越久,也越坚固,你命人多做些大模子,往里面按比例放石灰、黄土、沙石。敲打几天,然后堆砌起来。”

多日后,这些三合土已经干透,硬邦邦的,和石头一样,用铁锹拍打三合土表面,结果不碎,只留下一道道白色的划痕。

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