Detailed description:

The SJ_S type CA mortar funnel is mainly used for CA mortar flowability testing, mixing, and forming. It is widely used in high-speed railway CA mortar testing and has been widely used on the Qinshen Expressway, Jinghu Expressway, Wuhan Guangzhou Expressway, and Guangzhou Shenzhen High speed Railway. It is made of brass and has the advantages of easy use and accurate data.

The CA mortar flowability test face is carried out using the "funnel method", with a funnel volume of 640ml, an upper diameter of lining ф 70mm, a lower diameter of middle ф 10mm, and a height of 450mm. It is made of brass or stainless steel, and the prepared mortar is injected into the funnel. The outlet valve is opened and the timer is started. The time it takes for the mortar to flow out completely from the leak is the flowability of the mortar - t (measured in seconds). The test method for working time is the same as that for flowability, but the same sample is tested every 5 minutes and a flowability curve is drawn, which corresponds to the relationship between flowability and cumulative time. The time that mortar experiences within the designed range of fluidity. The working time of mortar is T (measured in minutes).

Instructions for using SJ_S type CA mortar funnel: The flowability and working time of CA mortar are important indicators to ensure the quality of on-site pouring construction of CA mortar for slab track.

To determine the flowability index of CA mortar, a funnel with a volume of 650ml was used for testing. The mixed mortar was injected into the funnel, and the time it took for all the mortar to flow out from the outlet was the flowability. Appropriate flowability is crucial for the performance and pouring quality of mortar. If the flowability is too small, the mortar material will segregate, affecting its strength and durability; If the flow is too large and the mortar is viscous, it is difficult to fill the space between the track board and the foundation tightly, which directly affects the quality of the pouring.

There are many factors that affect the flowability of CA mortar. Under the conditions of mixing method and feeding sequence, the flowability varies with temperature, additives, mix proportions of main raw materials, and water cement ratio.

The working time of CA mortar refers to the time it takes for CA mortar to be within the specified range of fluidity. This time should be relatively long without affecting the on-site grouting construction of the mortar. Considering the transportation process and the time required for pouring operations from the mortar mixing station on site, it is stipulated that the working time of CA mortar should not be less than 30 minutes.