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首页> 外文期刊>Magazine of Concrete Research >Enhancements in surface quality of concrete through use of controlled permeability formwork liners
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Enhancements in surface quality of concrete through use of controlled permeability formwork liners

机译：通过使用可控渗透性模板衬里提高混凝土的表面质量

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This report presents results of a study to compare the performance of concrete wall surfaces cast against controlled permeability formwork (CPF) liners with that of concrete surfaces cast against conventional impermeable plywood formwork. Two formwork liners were used, namely 'Zemdrain', a proprietary spun-bonded formwork liner manufac- tured by Dupont, and 'Lotrak FL', a woven geotextile manufactured by Don & Low. A variety of test methods were used to assess performance, including surface hardness, initial surface adsorption, sorptivity, depth of carbonation, chloride penetration and freeze-thaw resistance. In addition, the quality of the surface finish was assessed visually. Two concrete mixes and two different curing regimes were tested. The variation in surface quality of concrete with Depth from the top of the pour was also examined. Results demonstrate that surface qualities of concrete can be Markedly improved by use of CPE liners. The two liners produced identical enhancements in surface quality. They Differed in one aspect of performance only, as cement particles were able to travel through the Lotrak fabric and to Bond to the backing plywood, necessitating cleaning of the plywood after each cast. This problem did not arise with Zemdrain. Eiffectiveness of CPF liners was slightly greater for the lower-grade mix and slightly lower close to the Top of a pour. It is also observed that measured enhancements in performance may be strongly influenced by test duration.
机译：该报告提供了一项研究结果，用于比较用可控渗透性模板（CPF）衬砌浇铸的混凝土墙表面与用常规不渗透性胶合板模板浇铸的混凝土表面的性能。使用了两个模板衬里，分别是Dupont制造的专有的纺粘模板衬里“ Zemdrain”和Don＆Low生产的机织土工织物“ Lotrak FL”。各种测试方法用于评估性能，包括表面硬度，初始表面吸附，吸附性，碳化深度，氯化物渗透性和耐冻融性。另外，目测评价表面光洁度的质量。测试了两种混凝土混合物和两种不同的固化方式。还检查了混凝土表面质量随浇筑深度从顶部开始的变化。结果表明，使用CPE衬里可以显着改善混凝土的表面质量。两种衬板在表面质量上产生了相同的提高。它们仅在性能方面有所不同，因为水泥颗粒能够穿过Lotrak织物并粘结到衬板胶合板上，因此每次浇铸后都必须清洁胶合板。 Zemdrain不会出现此问题。对于低等级混合料，CPF衬板的效力略高，而在浇注顶部附近则略低。还可以观察到，测得的性能增强可能受测试持续时间的强烈影响。

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