Anhui Yulong New Material Technology Co., Ltd. is a company mainly engaged in water-retaining and tackifiers. Our company produces water-retaining tackifiers. This product has excellent water retention, workability, pumpability and adaptability. It can improve the water retention of concrete and avoid segregation and bleeding; improve the sensitivity of water-reducing agents and improve the anti-sag properties of accelerating agents. Used in the compounding and synthesis of water reducing agents and accelerating setting agents, it can not only improve product performance but also reduce production costs.
In real life, bleeding is one of the most common phenomena in the concrete production process, and it has a great impact on concrete, thereby affecting the quality of concrete. The causes of bleeding in concrete were analyzed, the impact of bleeding on concrete was discussed, and practical and effective countermeasures were proposed.
2 Under normal circumstances, if we achieve scientific design, reasonable operation, and qualified materials for the mix ratio of concrete, we can make appropriate adjustments to the quality and appearance of the concrete by using water-retaining tackifiers, etc. However, we have almost no direct adjustment measures for the bleeding phenomenon of concrete. This is because the bleeding phenomenon of concrete has always been a relatively difficult technical problem, and the bleeding phenomenon of concrete is affected and restricted by many unfavorable factors. Below, the author carefully combines his own actual situation to conduct an in-depth analysis and discussion of the impact of bleeding on concrete, and proposes effective countermeasures and measures.
1 Analysis of the impact of bleeding phenomenon on concrete
The impact of bleeding phenomenon on concrete is extremely important, and its analysis is particularly important and critical. We know that after bleeding occurs in concrete, defects will generally appear, and the compressive and tensile strengths of the areas where bleeding occurs will be further reduced, thus reducing the overall strength of the concrete to a great extent.
Generally speaking, bleeding does not have a great impact on the strength of concrete. However, the impact on the durability of concrete is extremely critical and must be paid enough attention to. In fact, the impact of bleeding on the durability of concrete is mainly due to the fact that after water is secreted from the inside of the concrete to its surface, small channels from the inside to the outside are formed in the concrete. These channels first reduce the anti-penetration ability of concrete, and have a great impact on the anti-permeability performance of concrete. This must attract our sufficient attention and actively take effective measures to solve and implement it.
Second, the bleeding phenomenon has a greater impact on the corrosion resistance and frost resistance of concrete. This is because corrosive substances generally enter the interior of the concrete more easily through small channels and reach the location of the steel bars. Corrosion or rust of steel bars can also directly cause some corrosion or reaction with hydration products. For the same reason, due to the existence of bleeding phenomena and small channels, concrete that has been corroded by wind, frost, rain and snow for a long time can quickly reach a saturated state. Generally speaking, saturated concrete will cause certain freezing, thawing or damaging effects on concrete under the effects of freezing and thawing cycles, which is absolutely not allowed for concrete. In addition, the bleeding phenomenon that occurs after concrete is poured, when the water evaporates beyond a certain level, will produce a certain degree of plastic shrinkage on the surface of the concrete due to the influence of capillary contraction. Since the density of sand and gravel is greater than the density of cement slurry, uneven settlement and shrinkage are prone to occur. If the concrete is not sufficiently plastered or maintained in time before it solidifies, a certain degree of cracks will occur. The resulting cracks will seriously affect the quality and durability of concrete.
2 Analysis of the causes of bleeding in concrete
2.1 Materials
Materials are the key cause of bleeding in concrete.
Materials affect the bleeding phenomenon of concrete to a certain extent, which is mainly related to its particle shape, thickness, reactivity, etc. Generally speaking, the finer the material used in concrete, the larger its surface area, and the greater the amount of water required. In fact, more water is needed for wetting. At the same time, if the material used in concrete is relatively fine, its reactivity increases, and the amount of water required for the reaction also increases. As the amount of water increases, the amount of water forming the bleeding phenomenon will inevitably decrease accordingly, thereby achieving the purpose of reducing the bleeding phenomenon. In addition, the materials used in finer concrete generally refine the pores, etc., thereby reducing the connection effect of the concrete pores, causing the number of bleeding channels to decrease, and the length of the bleeding channels to increase, which will inevitably lead to The bleeding phenomenon of concrete is reduced accordingly� Ground to induce air. In addition, on the basis of ensuring the quality and level of construction, water consumption should be reduced as much as possible.
3.4 Improving the bleeding phenomenon
Improving the bleeding phenomenon is an important strategy to prevent the bleeding phenomenon in concrete. In this regard, we can gradually improve the phenomenon of concrete bleeding by adding external materials. Generally speaking, external materials such as water-reducing agents are composed of a mixture of various molecules. Therefore, we must further optimize the molecular weight ratio of external materials such as water-reducing agents on the basis of reducing bleeding and ensuring the water reduction rate, so that the external materials can achieve the best ratio.
4 Conclusion
The phenomenon of concrete bleeding has always been a problem in construction construction. In this regard, we must conduct an in-depth analysis of the reasons for the bleeding phenomenon in concrete, and actively adopt appropriate water-retaining and thickening agents to improve performance, so as to better control or reduce the bleeding phenomenon in concrete, and continuously improve The quality of the concrete and the level of building construction. </p
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