Construction and maintenance measures:
⑴ During grouting, the average daily temperature should not be lower than ℃. After grouting, the exposed parts should be sprayed with curing agent or covered with plastic film in time, and covered with wet straw bags to keep them moist. When covered with plastic film, the exposed surface of the cement-based grouting material should be covered tightly to keep condensation water in the plastic film. When watering is inconvenient, curing agent can be sprayed on the surface of the grouting material.
⑵ The grouting material should be kept in a moist state, and the curing time should not be shorter than that.
⑶ When using fast-setting and fast-hardening cement-based grouting materials, maintenance measures should be carried out according to the methods required by the product.
⑷ During winter construction, when the project has no special requirements for strength growth, [] after grouting is completed, the exposed parts should be promptly covered with plastic film and covered with insulation materials. The initial curing temperature should not be higher than ℃. Do not water during maintenance under negative temperature conditions.
⑸When the difference between the surface temperature of the cement-based grouting material and the ambient temperature after the formwork is removed is greater than ℃, it should be covered and cured with
thermal insulation materials.
⑹ If the ambient temperature is lower than the minimum construction temperature required for cement-based grouting materials or the strength needs to increase
, artificial heating maintenance methods can be used. The maintenance measures should comply with the current national standard "Construction Engineering
Cheng Dong Period Construction Regulations". &
Special grouting material for large steel structure installation