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Answer:
In a high temperature environment (>35°C), the retarding effect of hydroxycarboxylate retarders (such as sodium gluconate) will be significantly weakened. The following measures are recommended:
1. Dosage adjustment: For every 5°C increase in temperature, the retarder dosage needs to be increased by 0.02%-0.03% (based on the total amount of adhesive), but the total dosage must not exceed 0.3% (to avoid strength shrinkage);
2. Composite use: Use lignin sulfonate retarding components (such as wood calcium) to extend the setting time through multiple mechanisms;
3. Process coordination: Cover the heat insulation film immediately after pouring to reduce the evaporation rate of surface moisture
Answer:
This phenomenon is usually related to the excessive C3A content in cement (>8%) or abnormal gypsum morphology. Suggestions:
1. Adjust the molecular structure of the water reducer: introduce more carboxylic acid groups during synthesis to enhance the adsorption competition for C3A;
2. Add stabilizing components: add 0.1%-0.2% triethanolamine or sodium thiosulfate to delay the initial hydration of cement;
3. On-site emergency plan: replace 20% of the mixing water with ice water (≤10℃) and reduce the system temperature by 5-8℃.
Note: It is necessary to analyze the mineral composition of cement through XRD and optimize the formula in a targeted manner.
Answer:
The whitening is caused by the migration and precipitation of incompletely reacted sodium methylsilane in the waterproofing agent. Solution:
Prefer high-polymerization products: choose silicone-acrylic emulsion waterproofing agent with polymerization degree>80%;
Control the dosage: the solid dosage is strictly limited to 1.2%-1.5%, and excessive dosage will lead to salt enrichment;
Process optimization: After construction, use 60℃ hot air circulation for 2 hours to promote complete cross-linking of siloxane.
Data support: After SEM testing, the surface porosity of the optimized mortar is reduced to 0.8%, and the risk of salt precipitation is reduced by 76%.
Answer:
Traditional calcium nitrate antifreeze is easy to cause later strength loss in -10℃ environment. It is recommended to:
Use a composite antifreeze system:
Early strength component: sodium nitrite (3%) + triisopropanolamine (0.05%)
Antifreeze component: urea (2%) + ethylene glycol (1.5%)
Air entraining component: rosin thermopolymer (0.02%)
Combined with heat storage curing: Immediately cover with 50mm thick flame retardant insulation cotton after pouring, maintain positive temperature curing > 72h;
Restriction conditions: Concrete mold temperature ≥ 5℃, antifreeze dosage does not exceed 5% of the total amount of adhesive.
Project case: A complex project in Harbin applied this solution, and the R28 strength reached 102% of the design value in -15℃ environment.
Yunshengguang Technology: High-efficiency additives, quality assurance, sincerely invite you to join hands for a win-win situation!
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