000003021 001__ 3021
000003021 005__ 20141118153411.0
000003021 04107 $$acze
000003021 046__ $$k2010-09-22
000003021 100__ $$aIslam, Md.T.
000003021 24500 $$aStress rate sensitivity of masonry units bound with hydraulic lime mortar

000003021 24630 $$n2.$$pHistoric Mortars and RILEM TC 203-RHM Final Workshop
000003021 260__ $$bRILEM Publications s.a.r.l., 157 rue des Blains F-92220 Bagneux - France
000003021 506__ $$arestricted
000003021 520__ $$2eng$$aIt is well established that most construction materials behave differently under static and dynamic loading. The stress-rate sensitivity of concrete, steel and rock has been intensively investigated. However, the literature on the timedependent response of masonry joints is scarce, particularly with regard to bond behaviour in historical stone masonry. This paper describes the dynamic response of sandstone masonry units bound with hydraulic lime mortars. A drop weight impact machine was used to generate stress rates in the range of 1kPa/s to 107kPa/s. The dynamic impact factor and stress rate sensitivity were evaluated for the flexural strength of the mortar and for the bond strength and further, the pattern of failure was noted for each mix and loading rate. Based on a related study, polypropylene micro-fibres were incorporated at 0%, 0.25% and 0.5% volume fraction into the mortar. Results show that although hydraulic lime mortar is stress rate sensitive, the dynamic impact factor is overestimated by existing CEB-FIP models. Further, the stress rate sensitivity of the bond strength decreased with an increase in the fibre content. Also, where as the mode of failure in the masonry units under quasi-static loading was through fracture at the mortar-block interface, the failure plane transferred to within the mortar under dynamic loading, particularly with fibre reinforcement.

000003021 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000003021 653__ $$a

000003021 7112_ $$a2nd Conference and of the Final Workshop of RILEM TC 203-RHM$$cPrague (CZ)$$d2010-09-22 / 2010-09-24$$gHMC2010
000003021 720__ $$aIslam, Md.T.$$iBindiganavile, V.$$iChan, R.
000003021 8560_ $$ffischerc@itam.cas.cz
000003021 8564_ $$s428300$$uhttps://invenio.itam.cas.cz/record/3021/files/page_1059.pdf$$y
             Original version of the author's contribution as presented on CD, , page 1059.
            
000003021 962__ $$r2907
000003021 980__ $$aPAPER