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第397章 生石灰遇水显神迹(1 / 2)

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石灰石磨粉是个气力活,需要将放在臼子中的石灰石用石杵反复捶打,直至石灰石粉末化。

吴里正带来的石臼子不小,能将所有煅烧后的石灰石一次性装下,但沈筝还是让牛储二人分两次凿粉。

贪多嚼不烂这个道理大家都懂。

清晨的河风凉悠悠的,布坊四周都没有建筑挡风,吹得沈筝抱紧了双臂。

石杵被高抬又放下,拳头大小的石灰石逐渐破碎、成粉。

余时章看着牛储动作,侧身问道沈筝:“凿成粉的,就是生石灰粉了?”

沈筝点点头,在心中估算着此次凿粉需要的时间,为往后大量煅烧石灰石做着打算。

“现在是生石灰粉,加水和匀后,就是熟石灰了,铺地需要熟石灰。”

余时章吸收着新鲜知识,“那用熟石灰,黄土,还有细沙混合成的东西铺成的地,叫什么地?”

沈筝一瞬不瞬地看着牛储动作,答道:“叫三合土,这种地面不是铺上就能用的,要分层捶打夯实。正如下官昨日与您说的那般,锤得越好,往后管得越久。”

她打了个比方:“说不准往后下官人都没了,这地还在。”

余时章瞪了她一眼:“大清早的,说得什么话。”

他又顿了顿,看着摆放在旁的黄土和细沙,又看了看不远处的河道,“那地不怕水?下大雨什么的,怎么办?会被冲垮冲散吗?”

“不会。”沈筝笃定摇头,“石灰和黄土混合,有良好的吸水性,再加上河边的细沙,除非地面被长期泡在水中,不然普通的雨水对三合土地面造不成任何伤害。比如连下几日的大雨,他们将能吸收的雨水吸收了,不能吸收的雨水就会渗透到地底,或是向一旁流去。”

她指了指头上,又说:“但凡雨后出了太阳,三合土晾干不过一日的功夫。”

余时章点了点头,但他看待事物很全面,“那这地,有什么怕的?”

他还是有点不信,靠这些东西做出来的地面,能任何弊端都没有。

沈筝低头想了一会儿,若说三合土的弊端,还是有的,但这一弊端在如今的大周,可以忽略不计。

她又给余时章打了个比方:“弊端......不太‘牢固’应当算吧?比如下雨时同时有三四辆载货的马车压在上面,地面会凹陷,土可能会移位。”

余时章顿时不知道说什么好。

这也算弊端?

他神情复杂,“没了?”

沈筝又仔细想了会儿,突然“哦”了一声,“这三种原料混合的比例也很重要,特别是黄土。”

她毫不嫌脏,抓起一把黏糊糊的黄土在手中揉搓。

“若是黄土加多了,地面遇水会变得湿滑,走在上面可能会打滑。若是黄土少了,地面粘黏度不够,可能会开裂。”

余时章顶着复杂的神情,低头想了一会儿,“那这三种原料的比例,当如何?”

沈筝蹲下身,将手中的黄土放了回去,又抓起一把河沙细看。

吴里正命人挖河沙时,选的都是表层晾晒干的河沙。这种河沙一粒是一粒的,其中只含有极少的泥土。

她将河沙摊在掌中,轻吹一口气,一粒粒河沙飘散而下,像是下了场小沙雨。

这河沙在沈筝眼中,就是极为标准的细沙。而用细沙配制三合土,只需要用标准比例便好。

她开口道:“一份石灰粉,两份黄土,四份细沙,混合后加入少许水,便可以铺在地面上,开始拍打夯实了。”

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