第六十八章 吃人有理
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修桥铺路并非易事，但总体来说，修桥的难度要比修路高一些。网址找回邮件：ltxsba@gmail.com而且和一千五百年后不同，唐朝的关中地区，河道不说堪比江南，但绝对算得上河流丛生。
而且这些河流之间，还夹杂着大量的沟坎，宛若炮弹坑的灌水塘，以及汉朝使用至今的灌溉渠。坎儿井这般的玩意儿，各种各样的原上，都有痕迹。
平日里还不觉得如何，但这几年战事颇多。轮换的军旅时常要从长安地区走一遭，皇帝几次从朱雀门阅兵外加视察，路桥都让人不省心。
以这个年代的生产力，寻常的木桥，能够承载一军一次顺利通过，就算是非常不错的质量。
然而往往发生的情况就是，两百里的距离内，军粮运转需要的时间，只要有两三座桥，可能就会花费超过平地运输五六倍的时间。
贞观三年时候，唐军在河北就遇到过这种尴尬，好在贞观三年的唐军已经蜕变成了狂战士。没吃的一时半会儿也不会闹，冲过去抢就是了。
面对当下天王级大佬们的胃口，老张现在并非是去做大市场还是如何，而是首先解决现实需求。
皇帝朝廷以及百姓还有不入流的商人，都需要在关洛地区行走的更加畅通。
而张德在贞观五年，就疯狂地推销前朝李春的赵州桥。
在滑轮组等新式工具的帮助下，石拱桥的施工难度并不大，真正制约完工时间的，反而是对石块的打磨。然后就是长期使用后的桥面铺装开裂以及渗水。
河南道，尤其是洛阳地区，就出现过制作不佳的石拱桥因黄河而垮塌。
因地制宜，此时的长安地区，水资源还是相对丰富的，于是问题并非是路面渗水，反而是拱土填料湿软，产生形变，让石拱桥水平推力降低，耐压性下降。
解决这个问题不难，两样东西，一是水泥，二是煤灰。
后者很好解决，两京甚至是太原，如今中户人家以上，都开始使用石炭，好一点的都用上了煤球，门第之家，自然都是张德所属河西煤矿的无烟煤。
但是水泥缺口极大，生产难度除开煅烧这个问题，就是粉碎。木制球磨机的使用条件当然是水力资源，所以这就限制了很多水泥需求缺口大，却又不能当地大规模生产的地方。
像塞北地区，尉迟恭在草原大兴土木，主要就是修建乌堡、棱堡、藏兵所还有粮洞。这些都需要大量的水泥来支撑草原控制这个战略工程，甚至青料塔修建，都只是配套工程。
再比如吐蕃高原地区，棱堡修建就更加迫切，寻常的关隘终究容易被打破。虽说人们常说堡垒往往都是从内部攻破的，然而技术上来说，还是前者要靠谱一些。
“江西要兴办水泥，倒是好的。不过像庐陵诸地，獠人时常作乱，岭南灰糖，已经鲜有走此处北上，反而是溯流北上，走的海路。”
张德所说的江西，自然是江南道西边一块，主要就是岳州、洪州、饶州。
这三州在一条线上，东西两个大湖，水网极为发达。鱼米资源对“忠义社”来说，已经不算是卖点，这一条线上的卖点在于丰富的人力、很丰富的水力、极为丰富的原材料。
真正让人眼馋的，正是饶州的独特土壤。
往后数百年风流的瓷都，就是在饶州。而且无解的是，其中有几种特型黏土，只有这里有，全世界独此一家别无分店。
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