M&S highlight: Jensen and Hansen (1995), A dilatometer for measuring autogenous deformation in hardening Portland cement paste

TY - JOUR

T1 - M&S highlight

T2 - Jensen and Hansen (1995), A dilatometer for measuring autogenous deformation in hardening Portland cement paste

AU - Lura, Pietro

AU - Kovler, Konstantin

N1 - Funding Information: An unsolved issue with measuring techniques of autogenous deformation was the fact that the volumetric and linear techniques on cement pastes yielded very different results. In [], some fundamental problems with the volumetric technique were pointed out, including the large effect of reabsorption of bleeding water and issues with entrapped air. In 2002, O.M. Jensen started to work with a master student [] on a much more important issue of the volumetric method, the early water absorption into the sample through the membrane when the samples are immersed in a water bath in the buoyancy method. This problem of the volumetric method had been observed by other authors (e.g. []) but its importance had not been fully understood. In 2003, Pietro Lura moved to DTU (to which O.M. Jensen had returned as professor) with a project funded by the Technical Research Council of Denmark (STVF). Work performed in 2003 and 2004 showed that water absorption alone would invalidate all volumetric measurements performed in a water bath. However, by changing the bath to paraffin oil (and the membrane from latex to polyurethane) the absorption of buoyancy liquid could be avoided and volumetric measurements and linear performed with corrugated tubes were nearly identical []. This unambiguous confirmation of the corrugated tubes method with a completely different measuring technique motivated an effort to standardize the corrugated tubes method, in particular the simpler and more affordable implementation with the manual measurements. After discussion with ASTM and setting up a committee, the first drafts of the future standard were written by Pietro Lura and O.M. Jensen in 2005. The ASTM C1698-09 Standard Test Method for Autogenous Strain of Cement Paste and Mortar was first published in 2009 []. In the meantime, a revised version (ASTM C1698-19) has been published.

PY - 2022/1

Y1 - 2022/1

KW - Autogenous deformation

KW - Measuring techniques

KW - Shrinkage

UR - http://www.scopus.com/inward/record.url?scp=85123762673&partnerID=8YFLogxK

U2 - 10.1617/s11527-021-01853-0

DO - 10.1617/s11527-021-01853-0

M3 - مقالة مرجعية

SN - 1359-5997

VL - 55

SP - 1

EP - 5

JO - Materials and Structures/Materiaux et Constructions

JF - Materials and Structures/Materiaux et Constructions

IS - 2

M1 - 39

ER -