造成映山红石材风化的物理原因

作者: youyistone 日期: 2016-09-07 10:08:26 人气: - 评论: 0

映山红石材经过长期的使用,最容易出现的一个问题就是风化,而造成它的风化的原因有很多,其中物理作用就是一大原因。

这物理作用一般包括以下几个原因:

一、粘裂作用:胶粘是石材安装方法中的一种,其残留在石材表面的粘胶因老化作用使粘接石材的胶结矿物产生松弛作用,使石材内部松弛,表面易剥落,从而加速石材的老化。

二、等植物的作用:在有水、温度适宜的条件下,苔藓、霉菌等有机物的孢子囊着附在石材的表面,开始发育生长,使石材表面形成各种各样的有机的色斑,这些有机物为了生存,与空气中的二氧化碳、二氧化硫、二氧化氮等物质相抗争,改变石材的表面纹理结构。另外,这些植物死后与水形成有机酸而加速石材的老化,使石材产生剥蚀的现象。

三、热能的作用:石材因日间受热而膨胀,夜间受冷而收缩,产生热胀冷缩现象,且石材中含有许多不同的矿物质,其膨胀系数不同,而发生粒状剥蚀或块状的崩解。

四、水的冻融亦可使石材风化:温度下降到00C以下,水结成冰,造成石材吸水后结冰的急剧膨胀,使石材崩解碎裂。

五、紫外线的照射:石材本身具有许多毛细孔,且毛细管越小毛细现象越显著。因此,石材吸水后,在阳光(紫外线)的辐射下,水份在石材的毛细孔中的蒸发速度随之加快,水份中带有对石材侵蚀的物质对石材的侵蚀速度也会加剧,从而引起石材的老化。

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