Water retention: HPMC, as a water retention agent, can prevent excessive evaporation and loss of water during the curing process. Temperature changes significantly affect the water retention of HPMC. The higher the temperature, the worse the water retention. If the mortar temperature exceeds 40°C, the water retention of HPMC will become poor, which will adversely affect the workability of the mortar. Therefore, in high-temperature summer construction, in order to achieve the water retention effect, high-quality HPMC products need to be added in sufficient amounts according to the formula. Otherwise, quality problems such as insufficient hydration, reduced strength, cracking, hollowing, and shedding caused by excessive drying will occur. question.
Bonding properties: HPMC has a significant impact on the workability and adhesion of mortar. Greater adhesion results in higher shear resistance and requires greater force during construction, resulting in reduced workability. As far as cellulose ether products are concerned, HPMC exhibits moderate adhesion.
Flowability and workability: HPMC can reduce friction between particles, making it easier to apply. This improved maneuverability ensures a more efficient construction process.
Crack resistance: HPMC forms a flexible matrix within the mortar, reducing internal stresses and minimizing the occurrence of shrinkage cracks. This increases the overall durability of the mortar, ensuring long-lasting results.
Compressive and Flexural Strength: HPMC increases the flexural strength of mortar by strengthening the matrix and improving the bonding between particles. This will increase resistance to external pressures and ensure the structural stability of the building.
Thermal performance: The addition of HPMC can produce lighter materials and reduce weight. This high void ratio helps with thermal insulation and can reduce the electrical conductivity of the material while maintaining a constant heat flux when subjected to the same heat flux. quantity. The resistance to heat transfer through the panel varies with the amount of HPMC added, with the highest incorporation of the additive resulting in an increase in thermal resistance compared to the reference mixture.
Air-entraining effect: The air-entraining effect of HPMC refers to the fact that the cellulose ether contains alkyl groups, which can reduce the surface energy of the aqueous solution, increase the air content in the dispersion, and improve the toughness of the bubble film and the toughness of pure water bubbles. It is relatively high and difficult to discharge.
Gel temperature: The gel temperature of HPMC refers to the temperature at which HPMC molecules form a gel in an aqueous solution under a certain concentration and pH value. Gel temperature is one of the important parameters for HPMC application, affecting the performance and effect of HPMC in various application fields. The gel temperature of HPMC increases with the increase in concentration. The increase in molecular weight and the decrease in the degree of substitution will also cause the gel temperature to increase.
HPMC has a significant impact on the properties of mortar at different temperatures. These impacts involve water retention, bonding performance, fluidity, crack resistance, compressive strength, flexural strength, thermal performance and air entrainment. . By rationally controlling the dosage and construction conditions of HPMC, the performance of the mortar can be optimized and its applicability and durability at different temperatures can be improved.
Post time: Oct-26-2024