Mix ratio design When preparing concrete, firstly, according to the requirements of workability, strength, durability, etc., the raw materials should be reasonably selected and the proportion of the materials should be determined to achieve economical application. The design of the concrete mix ratio is usually carried out in accordance with the requirements of the water-cement ratio rule. The calculation of the amount of material is mainly based on the assumed bulk density method or the absolute volume method. Concrete mixer Concrete mixer: According to different construction requirements and conditions, concrete can be stirred at the construction site or mixing station. The concrete mixture with good fluidity can be used as a self-dumping mixer; the fluidity is small or the dry hard concrete should be stirred by a forced mixer. Before mixing, the ingredients should be mixed according to the mixing ratio to control the weighing error. The feeding sequence and mixing time have an effect on the quality of the concrete, and should be strictly controlled to make the components of the components evenly mixed. Transportation and filling Conveying and filling: Concrete mixes can be transported to the construction site using hoppers, belt conveyors or mixer trucks. The filling method can be done manually or by means of machinery. Concrete pumping and filling concrete mixes are highly efficient and can reach hundreds of cubic meters per hour. Whether it is a concrete cast-in-place project or a prefabricated component, the compactness of the concrete after the filling must be ensured. The method mainly uses vibration tamping, and some use centrifugal, extrusion and vacuum operations. Fluid concrete mixed with some high-efficiency water reducer can not be shaken. Conservation The purpose of conservation is to create appropriate conditions of temperature and humidity to ensure or accelerate the normal hardening of concrete. Different curing methods have different effects on concrete performance. Commonly used conservation methods include natural conservation, steam curing, dry and wet heat curing, autoclaved curing, electric heating curing, infrared curing and solar energy conservation. The time of maintenance experience is called the maintenance cycle. For comparison purposes, test specimens that specify the performance of concrete must be cured under standard conditions. The standard curing conditions adopted in China are: temperature 20 ± 2 ° C; humidity not less than 95%. Stainless Steel Elbows,Stainless Steel Vertical Check Valve,Non-Return Valve,Check Valve ZHITONG PIPE VALVE TECHNOLOGY CO.,LTD , https://www.ztongvalve.com