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    预防混凝土表面出现起砂起尘的原因是什么?
    来源:http://www.jndmzp.com   时间:2016-9-29 16:59:15
    1、 要使混凝土有足够的强度等级,特别是面层混凝土要有足够的强度。
    1, to make the concrete has sufficient strength grade, in particular, the surface layer of concrete should have sufficient strength.
    2、 保证新拌混凝土有合理的水灰比,特别是表面层的混凝土的水灰比,应避免各种加大混凝土面层水灰比的操作方法。
    2, to ensure that the new concrete has a reasonable proportion of water cement ratio, especially the surface layer of concrete water cement ratio, should avoid all kinds of increase the water cement ratio of concrete surface layer of the operation method.
    3、 新拌混凝土本身要具有较好的保水性,防止严重的泌水导致混凝土表层水灰比过大。混凝土路面、地面施工中要从配合比及组成材料的选择出发,要注意控制水灰比不宜过大、外加剂不要过掺,以及凝结时间要适宜。水泥的凝结时间不宜过长,比表面积不宜过小;砂、石集料要符合国家质量要求,尤其要注意砂中0.315mm以下的颗粒含量,不宜使用细砂。
    3, fresh concrete has its good water retention, prevent serious bleeding resulting in water cement concrete surface is too large. The ground construction of concrete pavement, to form material from the mix and the choice of attention should be paid to control the water cement ratio should not be too large, not too admixture doped, and the setting time should be appropriate. The setting time of cement should not be too long, the specific surface area should not be too small; sand and stone aggregate to meet the national quality requirements, in particular, should pay attention to the sand in the following 0.315mm particle content, should not use fine sand.
    4 、施工过程要防止振捣过度造成混凝土严重的离析与泌水。
    4, the construction process to prevent excessive vibration caused by serious segregation and bleeding of concrete.
    5、注意及时养护,既要防止混凝土表面硬化之前被雨水冲刷造成混凝土表面水灰比过大,又要防止混凝土中的水分在表层建立起强度之前散失。尤其是掺有粉煤灰或矿渣的混凝土,养护时间不少于l4天
    5, pay attention to timely maintenance, it is necessary to prevent concrete surface hardening before being washed by surface water cement ratio of concrete is too large, but also to prevent the concrete water in the surface is established before the loss of strength. Especially the concrete with fly ash or slag, the curing time is not less than L4 days
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