24m预应力折线屋架施工计划(国外英文资料).docVIP

24m预应力折线屋架施工方案(国外英文资料) Fine aggregate rate were used to improve the strength of the concrete, and mixed compound admixtures, improve the workability, grading report provided by the professional test units, concrete mixing when in each of the raw materials by weight meter allowable deviation. (1)??? Cement, mixed mixed materials plus or minus 2%; (2)??????? The thickness of the aggregate is plus or minus 3 percent (the percentage of water is deducted by the measured amount); (3)??????? Water, admixture solution plus or minus 2%. 7, concrete mixing time shoulds not be too long or too short, generally within 2 minutes, concrete transportation should maintain its uniformity, no separation, no segregation, do not leak slurry, concrete to irrigate point, should be stipulated by the slump. Support to check the template, concrete casting steel and embedded parts, etc., accurate, and placing of concrete, concrete dao vibration, appropriate combination both ends to the middle, especially under the end several more concrete, ensure the concrete pouring is close-grained, concrete casting when there is no construction joints, vibration must be close-grained, instant light, on the surface of concrete to fill out the construction record in a timely manner. Concrete pouring is completed, will be within 3 hours of coverage and water conservation, early curing not less than 7 days and nights, especially in autumn and winter construction of concrete curing, keep the concrete surface has enough wetting condition, notice heat preservation, concrete curing heat preservation measures should be based on the construction of climatic conditions and the cost of raw materials and artificial cost. The test blocks are maintained under standard conditions, and the first batch of concrete must be produced for 3 days, 7 days and 28 days. In case of the design of the component, the initial strength of the component shall reach 30% of the design strength.???? Should be not less than 425 # ordinary P