High-strength non-shrink grouting material is composed of high-intensity materials as aggregates, cement as the binder, supplemented with high fluidity, slight expansion, and anti-segregation substances. Simply add a certain amount of water at the construction site, mix thoroughly, and it is ready for use. It is mainly used for secondary grouting of equipment foundations, reinforcement of beams, slabs, and columns, as well as emergency road repair projects.
Construction Steps:
1. Prepare mixers, grouting equipment, molds, and maintenance materials. Clean the grouting area and moisten the concrete surface in advance.
2. Set up formwork and seal the connections with cement (sand) mortar and plastic tape to ensure no water or mortar leakage.
3. Add water at 12-15% of the slurry weight and mix (mechanical stirring for 2-3 minutes, manual stirring for more than 5 minutes)
4. Pour the well-mixed grout into the grouting area from one direction. Use bamboo sticks or steel rods for guidance if necessary, and gently vibrate or tap the formwork for proper compaction.
5. After completion of construction, immediately cover with plastic film and then place straw curtains or cotton blankets for moist curing for 3-7 days.
6. Use temperature between -10℃ and 40℃. Strictly prohibited to add any admixture or external material to the grouting material.
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Room Temperature Care
1. Prior to grouting, the average daily temperature should not fall below 5°C. After grouting is complete, apply curing agent promptly or cover with plastic film, and use wet straw bags to maintain moisture. When using plastic film, ensure the surface of the cementitious grouting material is tightly covered to retain condensation water within the film. Avoid watering the grout surface; instead, apply the curing agent.
2. The grouting material should be kept moist, and the curing time must not be less than 7 days.
3. When using rapid-setting, rapid-hardening cementitious grouting materials, the curing measures should be carried out according to the method required by the product.
High-Temperature Maintenance
Take measures 24 hours prior to grouting to prevent the grouting area from direct sunlight or other heat radiation.
2. Implement appropriate cooling measures to ensure that the temperature of concrete foundation and the bottom plate of equipment in contact with the cement-based grouting material does not exceed 35°C.
The slurry temperature upon mold entry should not exceed 30°C.
4. After grouting, it is essential to promptly implement moisture retention and maintenance measures.
Winter Maintenance
1. During winter construction, if there are no special requirements for strength gain in the project, after grouting is completed, part of it should be covered with plastic film and insulated materials promptly. The initial curing temperature should not be lower than 5°C. Do not water during negative temperature curing.
After demolding, if the surface temperature of the cementitious grouting material exceeds the ambient temperature by more than 20°C, insulation material should be used for protection.
3. If the ambient temperature falls below the low construction temperature required for cementitious grouting materials or if an accelerated strength increase is needed, artificial heating and curing methods can be employed; the curing measures should comply with the relevant provisions of the current standard "Regulations for Winter Construction of Civil Engineering Projects" JGJ104.
