Sodium-based bentonite waterproof blanket manufacturers analyze common issues in waterproof engineering:
At Shuimu Engineering Materials Co., Ltd., we specialize in producing high-quality sodium-based bentonite waterproof blankets and have gained extensive experience in construction projects. Today, we'd like to share some of the challenges often encountered during waterproofing work:
The definition of waterproof materials is not always clear-cut. As waterproofing technology continues to evolve, the range of available materials has become increasingly diverse. In general, waterproof materials are used to prevent rainwater, groundwater, industrial and domestic water supply and drainage systems, corrosive liquids, as well as moisture and vapor from the air that can penetrate into buildings. These materials are collectively referred to as waterproofing solutions.
Common problems in waterproof engineering include:
One major issue is the high moisture content in basement substrates. Waterproof membranes typically require a moisture content of no more than 9%, but in reality, the moisture level on the base surface of basements often exceeds 30%, and in some cases, especially in trenches, it can be as high as 80-90%. Under such conditions, the success rate of using traditional waterproof membranes is nearly zero. To address this, inorganic waterproof coatings or a combination of inorganic coatings with cement-based polymer flexible coatings are recommended for application on wet surfaces.
Another common misconception is that a 1-meter thick basement floor doesn't need waterproofing. However, concrete thickness alone does not guarantee waterproofing. While concrete can act as a barrier, it cannot fully prevent seepage. Concrete is made up of cement and aggregates, and during the hydration process, only about 25-27% of water is needed for the chemical reaction. However, to achieve proper workability during mixing, up to 40-50% water is typically added. Once the hydration process is complete, the excess water evaporates, leaving behind capillary channels that allow water to seep through.
Some people believe that self-waterproofing structures can replace traditional waterproofing methods. This technique involves adding expansion agents like UEA or AEA during the concrete mixing process. The idea is that these agents generate expansion stress (0.2–0.7 MPa) to counteract the shrinkage stress caused by cement hydration. However, there are three strict requirements for this method:
1. The additive must be evenly distributed throughout the concrete.
2. Due to its low dosage, the concrete mix must not be too thin.
3. The additive is highly sensitive to moisture. If exposed to water before it fully reacts, it may expand prematurely, which can be harmful to the structure.
In large-scale construction, meeting these conditions is extremely challenging. For example, adding 8% of the additive to a large batch of sand and cement mixture is nearly impossible to do uniformly. If not properly mixed, areas with too much additive may cause excessive expansion, while areas with too little may result in insufficient expansion. This imbalance can lead to cracks at the interface. Additionally, if the concrete is too wet and the additive floats, it may expand in the wrong place, further compromising the integrity of the structure.
At Shuimu Engineering Materials Co., Ltd., we specialize in producing high-quality sodium-based bentonite waterproof blankets and have gained extensive experience in construction projects. Today, we'd like to share some of the challenges often encountered during waterproofing work:
The definition of waterproof materials is not always clear-cut. As waterproofing technology continues to evolve, the range of available materials has become increasingly diverse. In general, waterproof materials are used to prevent rainwater, groundwater, industrial and domestic water supply and drainage systems, corrosive liquids, as well as moisture and vapor from the air that can penetrate into buildings. These materials are collectively referred to as waterproofing solutions.
Common problems in waterproof engineering include:
One major issue is the high moisture content in basement substrates. Waterproof membranes typically require a moisture content of no more than 9%, but in reality, the moisture level on the base surface of basements often exceeds 30%, and in some cases, especially in trenches, it can be as high as 80-90%. Under such conditions, the success rate of using traditional waterproof membranes is nearly zero. To address this, inorganic waterproof coatings or a combination of inorganic coatings with cement-based polymer flexible coatings are recommended for application on wet surfaces.
Another common misconception is that a 1-meter thick basement floor doesn't need waterproofing. However, concrete thickness alone does not guarantee waterproofing. While concrete can act as a barrier, it cannot fully prevent seepage. Concrete is made up of cement and aggregates, and during the hydration process, only about 25-27% of water is needed for the chemical reaction. However, to achieve proper workability during mixing, up to 40-50% water is typically added. Once the hydration process is complete, the excess water evaporates, leaving behind capillary channels that allow water to seep through.
Some people believe that self-waterproofing structures can replace traditional waterproofing methods. This technique involves adding expansion agents like UEA or AEA during the concrete mixing process. The idea is that these agents generate expansion stress (0.2–0.7 MPa) to counteract the shrinkage stress caused by cement hydration. However, there are three strict requirements for this method:
1. The additive must be evenly distributed throughout the concrete.
2. Due to its low dosage, the concrete mix must not be too thin.
3. The additive is highly sensitive to moisture. If exposed to water before it fully reacts, it may expand prematurely, which can be harmful to the structure.
In large-scale construction, meeting these conditions is extremely challenging. For example, adding 8% of the additive to a large batch of sand and cement mixture is nearly impossible to do uniformly. If not properly mixed, areas with too much additive may cause excessive expansion, while areas with too little may result in insufficient expansion. This imbalance can lead to cracks at the interface. Additionally, if the concrete is too wet and the additive floats, it may expand in the wrong place, further compromising the integrity of the structure.
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