A water sorptivity test for martar and concrete

Abstract

This paper describes a test rig to measure the uni-directional water absorption of mortar and concrete. The test data acquisition is controlled by purpose written software installed on a PC and the results are utilised directly to obtain the sorptivity measured in g/mm2/minl/2 . As an example the apparatus was used to obtain the sorptivity of mortar in which the ordinary Portland cement was partially replaced by ground waste brick obtained from different sources. The results presented demonstrate the validity of the test, and the apparatus and the methodology are shown to be of sufficient sensitivity in detecting the differences between the sorptivities of the various mortars tested. The variation in the sorptivity with curing time and mixture composition was determined. The paper also gives the results of total water absorption tests conducted on the sorptivity test specimens, after being reconditioned, and the results of compressive strength tests for all the mortars investigated. RI~SU MI ~

Statistical view of evaluating concrete-surface-layer permeability tests in connection with changes in concrete formula

“…The principle of the test is the determination of the rate of water absorption (measured using a calibrated glass capillary) with a concrete cover of known area at a constant water pressure of a 200 mm water column. More can be found in [19][20][21] .…”

Porosity and Sorptivity of Aerated Concrete with Different Aluminium Powder Content

“…The weight of water absorbed was obtained at ten different times (1, 4, 9, 16, 25, 36, 49, 64, 81and 100 minutes) and the absorbed volume of water per unit area of absorbing surface was calculated for each. The cumulative water absorption i is proportional during the initial absorption period to the square root of the elapsed time t [23]. (5) where : is the cumulative volume of water absorbed per unit area; S, the sorptivity measured in mm 3 per mm 2 per min 1/2 and t, time in min.…”

Durability Study of Geopolymer Paste Blended with Blast Furnace Slag

“…Sorptivity is considered to be an important property associated with durability of cement concrete specimens [24]. Due to the capillary rises the water ingress into a non saturated cement concrete.…”