北欧桦木胶合板（建筑模板）的水份平衡问题
<p style="font-size: 18px; line-height: 40px; text-align: left; margin-bottom: 30px;"><span style="color: green;">最近一年多时间以来，国际铁矿石价格暴涨，中国国内的钢材价格也翻了倍地上涨。国内越来越多的大型施工单位放弃了钢模板，而选用进口木模板来进行混凝土的浇筑施工。</span></p>
<p style="font-size: 18px; line-height: 40px; text-align: left; margin-bottom: 30px;"><span style="color: green;">原因很简单：</span>1.<span style="color: green;">价格因素</span> 2.<span style="color: green;">混凝土浇筑的质量</span></p>
<p style="font-size: 18px; line-height: 40px; text-align: left; margin-bottom: 30px;">3.<span style="color: green;">低碳环保因素</span></p>
<p style="font-size: 18px; line-height: 40px; text-align: left; margin-bottom: 30px;"><span style="color: green;">然而，夏天到了，高温多雨。施工单位在户外面板拼装的时候，常会遇到暴雨，</span><span style="color: green;">然后太阳出来暴晒的天气。这种情况下很容易发生面板表面起皱，打孔位置有膨胀的现象，这些都是自然的情况：</span></p>
<p style="font-size: 18px; line-height: 40px; text-align: left; margin-bottom: 30px;"><img src="https://mmbiz.qpic.cn/mmbiz_jpg/hM33jw2zFuV9dflo3JdjT2WRuNEt5Zu7AQrYrshATUHFJ71HGHbOx1pQt1COFxyacvmjNVr8zMUjNaLsCGxpAw/640?wx_fmt=jpeg&tp=webp&wxfrom=5&wx_lazy=1&wx_co=1" style="width: 100%; margin-bottom: 20px;"></p>
<p style="font-size: 18px; line-height: 40px; text-align: left; margin-bottom: 30px;"><span style="color: green;">举例来说，</span>Riga®<span style="color: green;">里加板</span><span style="color: green;">，两面的覆膜都是</span>220g/m2<span style="color: green;">的，在正常使用周期内，吸水性能为</span>150g/m2*7<span style="color: green;">天。这个吸水特性，是多次使用后的稳定透水性能，可以使得混凝土浇筑表面形成光滑密致的原浆表面。这时的模板内部含水率约为</span>27%<span style="color: green;">左右。</span></p>
<p style="font-size: 18px; line-height: 40px; text-align: left; margin-bottom: 30px;"><span style="color: green;">但由于模板出厂时非常干燥，其内部含水率只有</span>8%<span style="color: green;">，因此在模板前几次浇筑时都会有一个水份进入模板内部的水份平衡快慢问题。在安装孔和新切割没封边的侧边，普遍会有吸水不均匀而产生的不均匀膨胀现象。在经过</span>3-5<span style="color: green;">次的实际浇筑后，模板内部的水份会从</span>8%<span style="color: green;">慢慢升高到</span>27%<span style="color: green;">，在最后水份平衡后，这些起皱膨胀现象都会慢慢消退的。在这个过程中，模板表面的一些细微的膨胀痕迹，不会对混凝土浇筑带来影响，色泽上也基本保持一致的。</span></p>
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