Construction and Maintenance of High Strength Non - shrinkage Grout Material at Different Temperatures
Different from the traditional concrete, high strength non-shrink Grout material to its durability as the primary technical indicators, by improving the material before and after the hardening of the performance, improve the durability of the Grout material structure and reliability. Curing is very important in the process of high-strength non-shrinkage Grout material structure formation. High-strength non-shrinkage Grout material is more sensitive to the condition of curing, more strict quality control, and good early maintenance of high strength non-shrink Grout material Significantly.
As the high-strength non-shrink Grout material in energy saving, food, engineering economy, labor protection and environmental protection and other aspects of significance, its application in civil engineering is rapidly promoting, therefore, to strengthen the high-strength non-shrinkage Grout material curing, And the method of high-strength non-shrinkage Grout material performance and mechanism of action is particularly important!
The following is the construction and maintenance of high strength non-shrink Grout material at different temperatures:
First, winter construction
Daily average temperature below 5 ℃ should be in accordance with the winter construction and meet the following requirements:
1. Before the Grout should take measures to preheat the base surface, so that the temperature maintained at 10 ℃ or more, and remove the water; 2. should not exceed 65 ℃ warm water mixing and cement-based Grout material, slurry into the mold temperature At 10 ℃ above; 3. Before freezing, the compressive strength of cement-based Grout material shall not be less than 5Mpa.
Winter construction and maintenance:
1. Winter construction, engineering strength growth without special requirements, the Grout after the exposed part of the plastic film should be covered in time and covered with insulation materials. The initial curing temperature should not be lower than 5 ℃. Do not wate in negative temperature conditions. 2. After the demoulding of cement-based Grout material surface temperature and ambient temperature difference is greater than 20 ℃, should be covered with insulation materials protection. 3. If the ambient temperature is lower than the minimum construction temperature required by the cement-based Grout material or the need to speed up the growth, the artificial heating and maintenance mode can be adopted. The conservation measures should conform to the relevant provisions of the existing national standard "Construction Rules for Winter" JGJ104.
Second, high temperature climate construction
Groove before the site temperature is greater than 35 ℃, should be high temperature climatic environment construction and meet the following requirements:
1. Take measures before the Grout to prevent the Grout site by direct sunlight or other heat radiation; 2. Take appropriate cooling measures, and cement-based Grout material contact with concrete foundation and equipment floor temperature is not greater than 35 ℃; 3 slurry into the mold The temperature should not be greater than 30 ℃; 4. Grout should be taken after the timely maintenance measures.
Third, room temperature conservation
1. Before Grout, the daily average temperature should not be less than 5 ℃, after the completion of the part of the Grout should be timely spraying curing agent or plastic film, covered with wet grass bags to keep moist. When covered with plastic film, the exposed surface of cement-based Grout material should be tightly covered, keep the plastic film within the condensate, Grout material surface inconvenience watering, spray curing agent. 2. should keep the Grout material in a wet state, curing time shall not be less than 7 days. 3. When using quick-setting quick-hard cement-based Grout material, the curing measures should be carried out according to the method of product requirements.