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type="text/css"></style> <div id="ct" class="ct2 wp cl"> <div class="mn"> <div class="bm_haa cl"> <div class="bm_h cl"> <a href="http://www.oecr.com/portal.php?mod=rss&catid=61" class="y xi2 rss" target="_blank" title="RSS">订阅</a><h1 class="xs2">文章</h1> </div></div> <div class="kjkjb"> <div class="bm vw" style="margin-bottom:0;"> <div class="h hm"> <div class="zxtoux"><img src="http://www.oecr.com/uc_server/avatar.php?uid=54876&size=small" /></div> <h1 class="ph">混凝土为什么会变形？科学家有了新发现 </h1> <p class="xg1"> 时间：2016-8-22 10:33<a class="zz" href="home.php?mod=space&uid=54876">作者：update</a> 阅读<em id="_viewnum">(1230)</em> 评论: <a href="http://www.oecr.com/portal.php?mod=comment&id=4748&idtype=aid" title="查看全部评论"><em id="_commentnum">5</em></a></p> <div class="zxfb" ><a href="http://www.oecr.com/portal.php?mod=rss&catid=61" class="y xi2 rss" target="_blank" title="RSS">订阅</a></div> </div> <!--[diy=diysummarytop]--><div id="diysummarytop" class="area"></div><!--[/diy]--> <div class="s"> <div class="ss"><div><span>导读： </span>对生活在城市中的人来说，建筑用的混凝土已是屡见不鲜之物。不过在这种银灰色的“石块”里可有什么秘密是我们不知道的么？知识产生自好奇。最近，美国科学家就突发奇想要研究混凝土为什么会变形的问题。并给大家展示 ...</div> </div> <!--[diy=diysummarybottom]--><div id="diysummarybottom" class="area"></div><!--[/diy]--> <div class="d"> <!--[diy=diycontenttop]--><div id="diycontenttop" class="area"></div><!--[/diy]--> <table cellpadding="0" cellspacing="0" class="vwtb"><tr><td id="article_content"><span style="color: rgb(67, 67, 67); font-family: 'Classic Grotesque W01', 'Hiragino Sans GB', 'Microsoft YaHei', STHeiti, 'WenQuanYi Micro Hei', Arial, SimSun, sans-serif; font-size: 16px; line-height: 24px; background-color: rgb(251, 251, 251);">对生活在城市中的人来说，建筑用的混凝土已是屡见不鲜之物。不过在这种银灰色的“石块”里可有什么秘密是我们不知道的么？知识产生自好奇。最近，美国科学家就突发奇想要研究混凝土为什么会变形的问题。并给大家展示了他们的研究成果。</span><div><div style="text-align: center;"><p><a href="data/attachment/portal/201608/22/103116lueir88ghkrleiir.jpeg" target="_blank"><img src="data/attachment/portal/201608/22/103116lueir88ghkrleiir.jpeg"></a></p></div><div><span style="background-color: rgb(251, 251, 251); font-size: 16px; line-height: 24px;"><font color="#434343" face="Classic Grotesque W01, Hiragino Sans GB, Microsoft YaHei, STHeiti, WenQuanYi Micro Hei, Arial, SimSun, sans-serif"><div>首先，我们来弄清楚混凝土到底是什么东西。混凝土基本上都是由沙石头和水泥粉混合而成。沙石、水泥粉和水以8：1：1的比例进行混合。沙石中的硅酸钙在水的作用下发生反应，相互黏着连成骨架。一般建筑工地上混凝土需要四周时间才能完全“发育”。混凝土在液态的时候具有可塑性，干燥后变得坚硬无比。在现代建筑中作为理想<a href="http://material.oecr.com" target="_blank" class="relatedlink">材料</a>被广泛使用。</div><div><br></div><div>需要注意的是混凝土的成形可不是一劳永逸的事。建筑师发现一个让他们疑惑不解的现象：混凝土建筑在若干年之后都会发生轻微形变。尽管这已经是建筑界的一个众所周知的常识，不过知其然不知其所以然，直到最近，科学家才解开了其中的诡秘之力。</div><div><br></div><div>看似巍然不动的混凝土内部一直没有停止变化。我们上面说过，在混凝土凝固时，沙石和水反应形成碳酸钙水合物作为混凝土的骨架。原来随着岁月的流逝，这些错综复杂的水合物会逐渐开裂。时间越长，这种内在崩塌就越严重。也就是说，混凝土的坚固只是“暂时的”。在几十年里或许不被察觉，不过这种人工材料还是不能和金字塔那种天然石材比长久。</div><div><br></div><div>这种“溶解-沉淀”的过程并非第一次被人提出，其实地理学家一直用它来解释地球表面的形态演变。不过，这次是这个<a href="http://theory.oecr.com" 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<span class="xg1 xw0">2016-8-23 08:01</span> </dt> <dd>挺感谢乏味的，能坚持下来。</dd> </dl><a name="comment_anchor_7921"></a> <dl id="comment_7921_li" class="ptm pbm bbda cl"> <dt class="mbm"> <span class="y xw0 xi2"> <a href="javascript:;" onclick="portal_comment_requote(7921, '4748');">引用</a> </span> <a href="http://club.oecr.com/space-uid-75655.html" class="xi2 xw1" c="1">arthas_zy</a> <span class="xg1 xw0">2016-8-23 07:01</span> </dt> <dd>占坑编辑ing</dd> </dl><a name="comment_anchor_7915"></a> <dl id="comment_7915_li" class="ptm pbm bbda cl"> <dt class="mbm"> <span class="y xw0 xi2"> <a href="javascript:;" onclick="portal_comment_requote(7915, '4748');">引用</a> </span> <a href="http://club.oecr.com/space-uid-54435.html" class="xi2 xw1" c="1">zjsz168</a> <span class="xg1 xw0">2016-8-23 04:01</span> </dt> <dd>确实还可以。</dd> </dl><a name="comment_anchor_7890"></a> <dl id="comment_7890_li" class="ptm pbm bbda cl"> <dt class="mbm"> <span class="y xw0 xi2"> <a href="javascript:;" 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