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用离心法生产的管芯,在承口立面即b点周围经常出现露砂露石现象。管芯口径越大,露砂露石的深度就越深。这种现象的出现,不但影响了产品的外观质量,同时,也经常引起承口端面和纵向钢筋渗水。根据多年的生产经验和对制品的破型发现,形成这一现象的主要原因是在b点周围环绕着一圈不规则的水泡层。这圈水泡层是怎样产生的呢? 离心压力管的管芯,通常采用三次加料成型,管芯壁厚在38～69mm之间。第一次料加至承口b点上3～5mm位置,经高速离心后,多余水分被排除,所形成的净浆层表面高度低于b点3～5mm。在所形成的净浆层和砂浆层内仍含有较多的水分,特别是6～
The cores produced by centrifugation often exhibit sanding and dewdrops around the b-point of the socket facade. The larger the caliber of the core, the deeper the depth of the exposed sand. The emergence of this phenomenon has not only affected the appearance quality of the product, but also often caused the water in the socket face and longitudinal reinforcement. According to many years of production experience and the discovery of broken products, the main reason for this phenomenon is that an irregular layer of blisters surrounds point b. How is the bubble layer generated? The core of the centrifugal pressure tube is usually formed by three times of feeding and the wall thickness of the core is between 38 and 69mm. The first material was added to the point 3~5mm on the point b of the socket. After high-speed centrifugation, excess moisture was removed, and the height of the formed slurry layer was lower than that of the b point by 3 to 5mm. In the formed slurry layer and mortar layer still contains more water, especially 6 ~