3. Time for seam cutting after paving

The time of initial seam cutting refers to the time experienced after the concrete is smoothed and formed.In actual construction, the important factors affecting the formation of concrete placement slump is not only the temperature, humidity, wind speed, the content of pavement thickness and concrete additive itself, such as the wind speed on the impact of the construction difficulty is very big, the wind speed larger place to determine the time of cutting sewing, as the case may be, in general, when the average temperature 10 ℃, day and night it started cutting seam time is 4 days, every add the average temperature of 5 ℃, its start slitting time reduced by 1 day.

4. Main factors affecting slump of pavement concrete

(1) gradation changes.Because water and cement to the same volume of aniseed and fine material package has a big difference, such as in the same water content and water-cement ratio of the case, the slump of fine concrete is far less than the slump of coarse concrete.Therefore, in the process of concrete production, continuous feeding should be carried out to the bone bin as far as possible to ensure that the aggregate gradation in the bin remains relatively stable, thus ensuring the gradation stability of concrete.

(2) change of water content.The change of water weight in mixing station can be known intuitively, but the water content of sand and stone and its change are difficult to grasp.Especially when the water content in sand changes greatly, the slump of concrete is very obvious.Especially the construction of the rainy season, more attention should be paid to the water content in the aggregate, water weighing should be deducted from the water content.

(3) cement temperature.Generally, the cement bin is only about 100t, and the amount of cement in the mixing building of HZS50 is more. Sometimes, when the cement is hit into the cement bin, the cement temperature has not cooled down and starts to stir. In this way, the slump degree decreases due to the high temperature of the delivered concrete.

(4) dosage of water reducing agent.The dosage of water reducing agent should not be too much, otherwise it will make some of the physical and chemical properties of concrete changes greatly, thus affecting the quality of concrete.So in the specific production process, the amount of superplasticizer should be relatively stable, will play a better role.

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