Publications de Pietro Lura | EPFL Graph Search

Young's modulus and creep of calcium-silicate-hydrate compacts measured by microindentation

Karen Scrivener, Pietro Lura, Zhangli Hu

In this paper, compacts of synthetic calcium silicate hydrate (C-S-H) with 0.8-1.5 calcium-to-silicon ratio (Ca/Si) and 30-80% porosity were prepared by one-direction cold pressing. The Young's modulus and the creep of C-S-H compacts were measured by micro ...

Pergamon-Elsevier Science Ltd2020

Visco-elastic behavior of blended cement pastes at early ages

Karen Scrivener, Pietro Lura, Zhangli Hu, Adrien Jean Régis Maurice Hilaire

This study aims at elucidating the visco-elastic behavior of hardening blended cement pastes, focusing on uni-axial basic compressive creep tests at early loading ages. Cement pastes with Portland cement only or blended with quartz or fly ash (both at a su ...

ELSEVIER SCI LTD2020

Basic creep of cement paste at early age - the role of cement hydration

Karen Scrivener, Pietro Lura

In this work, the uniaxial creep in compression during the first days of hydration is studied experimentally on cement pastes with w/c of 0.50. to order to assess the effect of the evolving microstructure on creep, the so-called equivalent systems are empl ...

Pergamon-Elsevier Science Ltd2019

Intrinsic viscoelasticity of C-S-H assessed from basic creep of cement pastes

Karen Scrivener, Julien Ston, Pietro Lura, Zhangli Hu, Adrien Jean Régis Maurice Hilaire

This paper investigates the fundamental mechanisms behind the effect of supplementary cementitious materials (SCMs) on the basic creep behavior of cement pastes. The intrinsic creep properties of the C-S-H gel are assessed based on measurements of uniaxial ...

Pergamon-Elsevier Science Ltd2019

Prediction of autogenous shrinkage of cement pastes as poro-visco-elastic deformation

Karen Scrivener, Pietro Lura, Zhangli Hu

Precise and robust predictions of autogenous shrinkage of high performance concrete are essential to limit self-induced stresses and cracking in modern concrete structures. This paper presents predictions of autogenous shrinkage for three cement pastes of ...

Pergamon-Elsevier Science Ltd2019

Water Redistribution-Microdiffusion in Cement Paste under Mechanical Loading Evidenced by H-1 NMR

Karen Scrivener, Pietro Lura

The mobility of water within the microstructure of hardened cement paste has been at the center of a long-lasting debate, motivated by the need to understand the fundamental mechanisms that play a role in drying, shrinkage, creep, and thermal expansion. Ou ...

2019

A novel method to predict internal relative humidity in cementitious materials by H-1 NMR

Karen Scrivener, Pietro Lura, Zhangli Hu

Pergamon-Elsevier Science Ltd2018

Corrugated tube protocol for autogenous shrinkage measurements: review and statistical assessment

Karen Scrivener, Pietro Lura, Zhangli Hu

Among different methods of measuring early age autogenous deformation of cementitious materials, the corrugated tube method described in the ASTMC1698-09 standard is one of the most commonly used. Despite the standardization and the common application of t ...

Springer2017

Prediction of self-desiccation in low water-to-cement ratio pastes based on pore structure evolution

Karen Scrivener, Hui Chen, Pietro Lura

High-performance concrete is sensitive to early-age cracking, mainly due to its rapidly-developing autogenous shrinkage. Autogenous shrinkage and internal relative humidity (RH) decrease are direct consequences of the emptying of capillary pores due to cem ...

Pergamon-Elsevier Science Ltd2013