1.1 reasons
(1) the adaptability of concrete admixture and cement concrete slump loss caused by bad fast.
(2) stationary concrete batching plant , water is not enough, the retarding effect is not ideal.
(3) the weather is hot, some admixture in high temperature failure; moisture to evaporate quickly; bubbles overflow caused by fresh concrete slump loss.
(4) the initial slump is too small, the unit water is too small.
(5) site and stirring station coordination is not good, the tank pressure, traffic time is too long, resulting in concrete slump loss is too large.
(6) the measurement error is large and unstable in concrete mixing and weighing system.
(7) the change of water content of coarse and fine aggregate.
(8) the cement mixed storage, mixed use.
1.2 solution
(1) adjust the concrete admixture to make it fit with the cement. Before construction, be sure to make concrete admixture and cement adaptability test.
(2) the adjustment of concrete mix, increase or decrease the rate of water, sand, concrete initial slump adjusted to more than 200mm.
(3) the addition of appropriate amount of fly ash to replace partial cement.
(4) the amount of concrete admixture is increased, and it is added to adjust the retarding component (especially when the temperature is much higher than the normal temperature).
(5) to prevent water evaporation and excessive bubble overflow.
(6) slag cement or volcanic ash cement.
(7) improving the water holding and cooling device of concrete transport vehicle.
(8) the accuracy of the measurement equipment shall meet the relevant provisions, and shall have a valid certificate issued by the Legal Metrology Department to strengthen the self check and ensure the accuracy of measurement.
(9) to strengthen the detection of the water content of the aggregate, and adjust the mix proportion in time when the change is changed.
(10) into the reservoir, the cement shall be stored and used in accordance with the manufacturer, variety and grade.
Haomei machinery equipment CO., LTD.
Email: ann@haomei.biz
Website: http://www.truck-mixer-cn.com
Office Add: No.14 Waihuan Road, New district, Zhengzhou, China
Tel: +86-371-65621392
Fax:+86-371-86616825