Recycled coarse aggregate water absorption testing method and system

Abstract

The invention relates to the technical field of recycled coarse aggregate measurement, and discloses a recycled coarse aggregate water absorption testing method and system, and the method comprises the following steps: measuring the mass m1 of dried recycled coarse aggregate; putting the mesh basket containing the recycled coarse aggregate into water at a preset temperature to enable the recycled coarse aggregate to stand in the water for 1440 minutes, and respectively collecting the water mass MT and M1 of the recycled coarse aggregate when the water absorption duration is T and 1440 minutes; taking out the recycled coarse aggregate, wiping to a saturated surface dry state, and measuring the mass m2 of the recycled coarse aggregate in the saturated surface dry state; and calculating the water absorption rate WT of the regenerated coarse aggregate when the water absorption duration is T, wherein WT=(MT+m2-m1-M1) / m1*100%. By setting T, the water absorption rate of the recycled coarse aggregate at any moment within 0-1440 min can be obtained, the early water absorption rate of the recycled coarse aggregate is tested, especially the water absorption rate of the recycled coarse aggregate in the first 10 min, and the influence of the recycled coarse aggregate on the slump of cement concrete can be conveniently estimated.

Description

technical field [0001] The invention relates to the technical field of measuring recycled coarse aggregates, in particular to a method and system for testing the water absorption of recycled coarse aggregates. Background technique [0002] The traditional method of testing the water absorption of primary coarse aggregate is to soak the primary coarse aggregate in water for 24 hours, then take out the primary coarse aggregate, wipe it with water-absorbing material until it is saturated and dry, weigh it, and calculate the water absorption after drying. However, due to the large mortar content in the recycled coarse aggregate, the fast water absorption rate, and the large water absorption capacity, the recycled coarse aggregate is close to saturation within 5-10 minutes of putting the recycled coarse aggregate in water. When the original coarse aggregate water absorption test method is used to test the water absorption of the recycled coarse aggregate, the water absorption tes...

AI Technical Summary

Problems solved by technology

[0003] After the regenerated coarse aggregate is taken out of the water, it takes at least 5 minutes to wipe the regenerated coarse aggregate to the surface-dry state with water-absorbing materials. The degree of wiping is different; and the recycled coarse aggregate is still absorbing water continuously during the wiping process, so the specific time for the calculated water absorption rate at this time will not be determined, and the shorter the soaking time of the recycled coarse aggregate in water , the more limited the method of using the above method to test the water absorption rate is, the water absorption rate may even be higher when soaked for 5 minutes than when soaked for 10 minutes

Images