Effects of temperature on autogenous deformation and early-age stress evolution in cement pastes with low water to cement ratio

Minfei Liang (Corresponding author), Chen Liu, Xuhui Liang, Ze Chang, Erik Schlangen, Branko Šavija

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Samenvatting

This paper investigates the influence of temperature on autogenous deformation and early-age stress (EAS) evolution in ordinary Portland cement paste using a recently developed Mini Temperature Stress Testing Machine (Mini-TSTM) and Mini Autogenous Deformation Testing Machine (Mini-ADTM). In the Mini-TSTM/ ADTM, CEM I 42.5 N paste with a water-cement ratio of 0.30 was tested under a curing temperature of 10, 15, 20, 25, 30, and 40 °C. X-Ray diffraction (XRD) tests were conducted to measure the amount of ettringite and calcium hydroxide, which reveals the micro-scale mechanisms of autogenous expansion. The applicability of the Maturity Concept (MC) for the prediction of autogenous deformation and relaxation modulus under different temperatures was also examined by the experimental data and the viscoelastic model. This paper leads to the following findings: 1) The autogenous deformation of ordinary Portland cement paste is a four-stage process comprising the initial shrinkage, autogenous expansion, plateau, and autogenous shrinkage; 2) Higher temperature leads to higher early-age cracking (EAC) risk because it accelerates the transitions through the first three stages and causes the autogenous shrinkage stage to start earlier. Moreover, higher temperatures also result in increased rates of autogenous shrinkage and EAS in the autogenous shrinkage stage; 3) Autogenous expansion and plateau are attributed to the crystallization pressure induced by CH. Temperature-dependent CH formation rates determine the duration of the plateau stage; 4) Low-temperature curing can delay but not completely prevent the EAC induced by autogenous deformation; 5) The MC cannot predict the autogenous deformation at different temperatures but can be used to calculate the relaxation modulus, which in turn aids in EAS prediction based on autogenous deformation data.
Originele taal-2Engels
Artikelnummer134752
Aantal pagina's15
TijdschriftConstruction and Building Materials
Volume411
DOI's
StatusGepubliceerd - 12 jan. 2024

Financiering

Minfei Liang and Chen Liu would like to acknowledge the funding supported by China Scholarship Council under grant number 202007000027 and 201906950102 , respectively. Branko Šavija acknowledges the financial support of the European Research Council (ERC) within the framework of the ERC Starting Grant Project “Auxetic Cementitious Composites by 3D printing (ACC-3D)”, Grant Agreement Number 101041342 .

FinanciersFinanciernummer
European Research Council101041342
China Scholarship Council201906950102, 202007000027

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