High Water Retention Agent Construction Grade HPMC Used in Drymix MortarJune 7th 2023
Cellulose for concrete. It is made from a special plant species in the alpine region through a series of unique chemical treatments and mechanical processing. It has the characteristics of natural hydrophilicity, high strength and high modulus, because it is a plant Cells naturally divide and grow and are not made artificially, so that the surface has a strong grip. Obon Concrete Cellulose can effectively control the micro-cracks caused by plastic shrinkage, dry shrinkage, temperature change and other factors of concrete, prevent and inhibit the formation and development of concrete original cracks, and greatly improve the anti-cracking and anti-permeability performance and erosion resistance of concrete , Increase the toughness of concrete, thereby increasing the service life of concrete.
Concrete specialty cellulose itself has excellent characteristics, such as natural hydrophilicity, excellent binding power, huge fiber specific surface area, and higher toughness and strength. After being added to concrete, it will be immersed in water and under external force. , The formation of a large number of uniformly distributed fine fibers can effectively prevent the plastic shrinkage, dry shrinkage and temperature changes of the concrete from causing cracks to significantly improve the mechanical properties of concrete.
In the hardening process of concrete, the hydrate of cement and water reacts, causing the shrinkage of the concrete volume. In the later stage, the free water in the concrete evaporates and causes drying shrinkage. These shrinkage stresses exceeding the tensile strength of the cement matrix will produce microscopic changes in the concrete. crack. About 70% of the development of micro-cracks is completed in the 3-7d gel period, when the tensile strength of concrete is less than 1MPa. After adding Obon concrete cellulose to the concrete, the fibers can be easily and evenly dispersed in the concrete to form a chaotic support system, which disperses the directional stress of the concrete, prevents the occurrence and development of the original cracks in the concrete, and eliminates or reduces the original micro The number and scale of the cracks greatly improve the anti-cracking and anti-seepage ability of the concrete, improve the toughness of the concrete, and thus extend the service life of the concrete. In addition, because the fiber itself has a certain strength, the fiber is evenly dispersed in the concrete and forms an anchoring effect, which can absorb a certain amount of destruction energy in an instant.
The effect of cellulose on concrete
1. Cellulose helps to absorb the function of concrete members when they are impacted, and due to the crack resistance effect of fibers, when concrete is subjected to impact load, the fibers can prevent the rapid expansion of internal cracks, so it can effectively enhance the impact resistance of concrete Sex and toughness.
2. Because of the good crack resistance effect of cellulose, the occurrence and development of cracks are greatly reduced, and the internal porosity is reduced, which slows the corrosion and penetration of water corrosive and chemical media in the external environment, chloride salts, etc., due to cracks A large number of reductions reduce the number of rusty channels for the main reinforcement of the structure, so that the durability of the concrete is greatly improved and enhanced.
3. Cellulose presents a three-dimensional distribution in concrete, which can effectively reduce the stress concentration at the tip of the microcrack, weaken or eliminate the tensile stress caused by the shrinkage of concrete or mortar, and prevent the occurrence and expansion of microcracks.