无锡汽车厂地坪价格是多少 400-0709-910(请拨打400-0709-910电话，永坚地坪公司)

From gray concrete floor underground car park concrete surface layer from the powder, sand, water from the skin caused by bleeding due in addition, there are also likely to be caused by the lack of curing time or excessive dehydration. Such as curing time is not enough, then sun exposure or dry air caused heavy evaporation, evaporation of surface moisture is greater than the rate of bleeding of concrete, surface moisture will lead to a large number of volatile, slow down or even stop the hydration of cement, cement surface is not fully hydration, the surface layer can not meet the design strength, sufficient surface strength can not be established, then there starting from the powder or sand, from skin and other quality problems.
Fresh concrete mix is ​​different from the particle size, the different densities of cement particles, sand, stone, and other solids and water and other components of concrete pouring in before coagulation, pouring new concrete suspended solid particles under gravity Shen, when there is insufficient water retention capacity of the concrete, pouring new concrete surface will be a layer of water, a phenomenon called bleeding. In the cement coagulation process, high density particles to settle, the density of small precipitation up water, resulting in the separation of solid particles and water, that fresh concrete bleeding and segregation, is inevitable kind trend. This phenomenon can only be slowed, but not eliminated.
About the underground car park from the gray cement floor, underground parking from the gray concrete floor construction requirements

      1, concreting requirements: concrete floor strength design requirements ≥C25,2 meters by foot margin of error ≤ 3mm.
2. Clean the floor: For new poured concrete, use trowel smooth, compacted, should conserve at least 15 days after the grinding, remove the surface of the white base and dust. For the old concrete floor hardener or emery ground,
Clear penetration of substances affect surface oil, paint and loose structure, then thoroughly clean the floor.
3, the old ground is too dry, use clean water to fully wet the concrete surface.
4, the use of a hardener sufficiently wet concrete surface pretreatment, and kept moist for 1-2 hours. It can be applied by brush, roller coating or spraying manner. If the local site dry period, additional material should be kept moist. During this period should be used and so on brush, mop or roller tool constant friction surface, so that the hardening agent can more effectively penetrate into the concrete.
5, when the temperature is high, the surface of the hardener quickly due to water evaporation becomes sticky, spray a small amount of water can dilute the thickened hardener, but the amount should not be excessive.
6, remove the remaining liquid: Use plastic wiper or mop the surface of the remaining liquid cleaned, can also be a lot of clean water, but need to be careful not to have water immersion phenomenon.
7, conservation: dry for 24 hours after the ground is within walking distance open, normal use should conserve seven days and then put into use. Hardener penetration of the active ingredient gradually and cement reaction, often with a damp mop to clean the floor can promote penetration into the concrete inside the gel reaction was continued earlier and get strength and gloss.
8, polishing: With the ground after the finished cement grade is too low with the use of time, the storage time is too long or stored moisture and other poor, poor cement mortar label Factors leading to the ground from the sand 2. The surface layer is too low, After flattening, surface pitting, sand exposed not dense, not light pressure. · Surface layer of low intensity, once used it from the sand. 3. sand particle size is too small, and large surface area, because the volume ratio is often used plastering mortar, the same amount of cement mortar label significantly reduced. In addition, when the clay content of more than 5% of sand, soil cement mortar label significantly reduced. Poor quality of sand is one of the factors leading to the ground from the sand. 4. mortar cement ratio is too large, in the surface layer of soft construction operations, it is difficult to push out the light. After the local surface dehydration, the surface layer of sand - flow water holes and pitting. In addition, as the consistency of the mortar is too thin, the slightest precipitation occurs segregation in the sand around the remaining grout package depopulated live sand, on sand bond strength is small, even in the face of a layer of grout laminated film, its strength is also very low, once used will soon wear, exposing the sand to, which in turn is caused by the weight of the ground from the sand地下停车场混凝土地面起灰混凝土面层的起粉、起砂、起皮除由于泌水引起外，也有可能是由养护时间不足或过分失水而引起。如养护时间不够，则在太阳曝晒或干燥空气中造成水分大量蒸发，表面水分的蒸发大于混凝土的泌水速度，将导致表层水分大量挥发，水泥会减缓甚至停止水化，表层水泥得不到充分的水化，面层就无法达到设计强度，建立不起足够的表面强度，进而出现起粉或起砂、起皮等质量问题。
　　新拌混凝土是由颗粒大小不同、密度不同的水泥颗粒、砂、石等多种固体和水等组成的混合料，混凝土浇筑后在凝结以前，新浇筑混凝土内悬浮的固体粒子在重力作用下下沉，当混凝土保水能力不足时，新浇筑的混凝土表面会出现一层水，这种现象叫做泌水。在水泥等的凝结过程中，密度大的粒子要沉降，密度小的水往上析出，因而产生了固体粒子与水的分离，即新拌混凝土的泌水和离析一样，是不可避免的一种趋势。这种现象只可减缓，但不能**。
关于地下停车场水泥地面起灰,地下停车场混凝土地面起灰施工要求

1、混凝土浇注要求：混凝土地面的强度设计要求≥C25，2米靠尺正负误差≤ 3mm。
　　2、清洁地面:对于新浇注的混凝土，使用抹光机抹平、压实，应至少养护15天 后再打磨、**表面的白碱和浮尘。对于旧的混凝土地面或金钢砂硬化剂地面，
　　**表面的油污、涂料和松散结构等影响渗透的物质，然后彻底清扫地面。
　　3、对过于干燥的旧地面，使用清洁水充分润湿混凝土表面。
　　4、使用硬化剂充分润湿预处理的混凝土表面，并保持湿润1-2小时。可以采用刷涂、辊涂或者喷涂的方式。期间如果局部部位变干，应及时补加材料保持湿润。在此期间应使用毛刷、拖把或者滚筒等工具不断摩擦表面，使硬化剂能更**地渗透到混凝土内部。
　　5、当气温较高时，表面的硬化剂由于水份蒸发的原因很快变粘稠，可喷涂少量水稀释变稠的硬化剂,但用量不宜过多。
　　6、**余液：使用塑胶刮子或拖把把表面剩余液体**干净，也可用大量清水冲洗干净，但需注意不能有积水浸泡现象。
　　7、养护：干燥24小时后地面可步行开放，正常使用应养护七天后再投入使用。渗透的硬化剂**成分逐渐与水泥反应，经常使用湿拖把清洁地面能促进渗透到混凝土内部的凝胶继续反应，能更早获得强度和光泽度 。
　　8、抛光：成品后的地面随着使用时间的用的水泥标号太低,存储时间过长或存储不善受潮等,劣质水泥是导致地面起砂的因素之 2.面层的砂浆标号太低,压平后,表面有麻点,砂粒外露不密实,压不出光来。·面层强度低,一经使用就起砂。 3.砂的粒径太小,而比表面积大,又因抹灰砂浆常采用体积比,同样的水泥用量,砂浆的标号明显降低。另外,砂的含泥量超过5%时,泥土使水泥砂浆的标号大幅度降低。砂的质量不好,也是导致地面起砂的因素之一。 4.砂浆的水灰比太大,在施工操作时面层软,很难压出光来。当地面脱水后,面层砂粒周转出现水孔及麻点。另外由于砂浆的稠度过稀,稍一沉淀就会出现离析,使剩余在砂粒周围过稀的水泥浆包裹不住砂粒,对砂粒的握裹力很小,即使在面层压出一层水泥浆薄膜,其强度也非常低,一经使用很快就会磨损,露出砂来,这又是造成地面起砂的重

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