P.R. BINGEL1, J.J. BROOKS2 and J.P. FORTH2 1 School of the Built Environment, Leeds Metropolitan University, Brunswick Building, Leeds LS2 8BU 2 School of Civil Engineering, University of Leeds, Leeds LS2 9JT
The results of creep tests on clay brickwork panels constructed with a 1:3 (by volume) hydraulic lime: sand mortar are presented. Two sizes of panel were tested in order to determine creep in the bed face and header face directions. For comparative purposes, similar tests were also carried out on panels constructed using the same bricks and a 1:2:9 (by volume) cement (OPC): hydrated lime: sand mortar. In view of the apparent very low compressive strength of the mortar made with hydraulic lime, loading was not applied until 150 days after construction of the brickwork. In the header face direction, creep of the brickwork built with the 1:3 hydraulic lime mortar was similar to that of the brickwork built with 1: 2: 9 cement mortar after 600 days under load. Surprisingly, creep of the 1:3 hydraulic lime mortar brickwork in the bed face direction was less than that in the header face direction and only 46% of that in the 1: 2: 9 cement mortar brickwork. Further creep tests are required on brickwork built with hydraulic lime mortar, in particular to clarify the apparent anomalous behaviour with respect to anisotropy of creep. The testing of 75mm mortar cubes for estimating the in-situ compressive strength of hydraulic lime mortar in the brickwork joints may also be inappropriate.