What are the disadvantages of water reducing admixtures in concrete

The limitations are increased drying shrinkage due to higher water content, cement concrete, and paste-to-aggregate ratio. Higher air contents may be required to provide adequate resistance to freezing, thawing, and salt scaling, and higher air contents reduce strength. Too much water added to the mix means that excess water is retained inside the concrete after finishing the curing process. This will often result in the formation of small cracks as the water eventually evaporates over time, reducing the concrete's compressive strength. When a concrete mixture is too wet, it causes more shrinkage during the drying process than is needed. As a result, the concrete has a great likelihood of cracking, and those cracks are likely to be a fairly good size. Concrete can also be protected against the water with acrylic, polyurethane, and polyurea-based materials that provide waterproofing in areas exposed to direct water and sunlight, such as roofs and terraces. All of these practices are applied directly to concrete surfaces. If a high amount of moisture is present in the concrete (over 3 lb according to a calcium chloride test), it is best to use a moisture vapor barrier coating. If the moisture content of the concrete is less than 4%, you can use a penetrating concrete waterproofing sealer. If you are looking for high quality, high purity and cost-effective water-reducing agent, or if you require the latest price of water-reducing agent, please feel free to email contact mis-asia.