Journal: Cement and Concrete Composites

Abbreviation

Cem. concr. compos.

Publisher

Elsevier

Journal Volumes

ISSN

0958-9465
1873-393X

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Publications 1 - 10 of 48
  • Ethyl silicate for surface treatment of concrete
    Item type: Journal Article
    Pigino, Barbara; Leemann, Andreas; Franzoni, Elisa; et al. (2012)
    Cement and Concrete Composites
  • The mechanism controlling corrosion of steel in carbonated cementitious materials in wetting and drying exposure
    Item type: Journal Article
    Stefanoni, Matteo; Angst, Ueli; Elsener, Bernhard (2020)
    Cement and Concrete Composites
    Experiments were performed to study the mechanism of corrosion of steel in carbonated concrete in cyclic wetting/drying exposure. It was found that the corrosion rate increased during wetting, followed by a decrease during drying. The increase and decrease of the corrosion rate can be explained by changes in electrochemically active steel area as a function of the moisture state of the mortar and its porosity. The corrosion rate achieved in the wet phase stabilizes during the first few wetting and drying cycles. The mechanism of the electrochemical process is discussed on the basis of theoretical considerations. It is concluded that the corrosion kinetics are under activation control. The availability of oxygen does not seem to be a limiting parameter for the corrosion process in cyclic wetting/drying exposure.
  • Pore structure of mortars with cellulose ether additions - Study of the air-void structure
    Item type: Journal Article
    Wyrzykowski, Mateusz; Kiesewetter, Rene; Muench, Beat; et al. (2015)
    Cement and Concrete Composites
  • A Rheometric Approach to Investigate the Effect of Cellulose ether on Crack Mitigation in Earth-based Concrete
    Item type: Journal Article
    Assunção, Julie; Brumaud, Coralie; Habert, Guillaume (2025)
    Cement and Concrete Composites
    This study investigates the impact of cellulose ethers (CE), particularly Hydroxyethyl Methyl Cellulose (HEMC), on the properties of earth-concrete mixes, focusing on both micro and macro-scale analyses. At the micro-scale, CE's influence on rheological responses and particle interactions was examined, revealing the formation of a robust network that enhances critical strain and yield stress, particularly with higher viscosity polymers. Analysis of total organic carbon in the pore solution indicated partial polymer adsorption, crucial for bridging solid particles and strengthening interparticle interactions. Moving to the macro-scale evaluation, in terms of compressive strength at 28 days, a notable increase was observed. Regarding shrinkage reduction, no clear correlation was found between polymer addition and shrinkage decrease in both stabilized and unstabilized earth mixes. Moreover, CE significantly mitigated crack formation in macro-scale samples, with the most pronounced effect seen in stabilized earth mixes—83% of tested mixes showed improvement compared to 45% in unstabilized mixes. The presence of CaCO3 formation further suggests its influence when combined with cellulose-based polymers. In conclusion, CE enhances the mechanical properties of earth-concrete mixes, offering promising applications in sustainable construction practices.
  • Compatibility between polycarboxylate-based admixtures and blended-cement pastes
    Item type: Journal Article
    Alonso, M. M.; Palacios, M.; Puertas, F. (2013)
    Cement and Concrete Composites
  • Shrinkage and creep of high-performance concrete based on calcium sulfoaluminate cement
    Item type: Journal Article
    Sirtoli, Davide; Wyrzykowski, Mateusz; Riva, Paolo; et al. (2019)
    Cement and Concrete Composites
  • Internal curing of high performance mortars with bottom ash
    Item type: Journal Article
    Wyrzykowski, Mateusz; Ghourchian, Sadegh; Sinthupinyo, Sakprayut; et al. (2016)
    Cement and Concrete Composites
  • Interaction of polycarboxylate-based superplasticizers with cements containing different C(3)A amounts
    Item type: Journal Article
    Zingg, Anatol; Winnefeld, Frank; Holzer, Lorenz; et al. (2009)
    Cement and Concrete Composites
    This parametric study links the molecular structure of a carboxylate-type of superplasticizer with their performance in cement pastes with different C3A-contents. Beside the variation of the C3A-content, the experimental synthesized superplasticizers have been varied by polyethylene-oxide side chain density and length. The connection between the superplasticizers, their effect on workability properties and retardation phenomenon and the dependency of C3A-content in the cement paste has been investigated. The characteristic interaction phenomenons between different PCE-architectures and different C3A-contents have been examined by calorimetric, rheological, adsorption, and zeta potential measurements. This study shows that with decreasing side chain density the PCE molecules adsorb stronger and thus, lower the yield stress of a cement paste by steric stabilization. It is also shown that PCE molecules with long side chains delaying the setting of the cement paste to less extend than PCE molecules with shorter side chains. Consequently, in terms of optimization of the molecular architecture, good workability can be achieved by addition of highly charged PCE with long side chains. The latter minimizes undesired retardation phenomena.
  • Mitigation of plastic shrinkage cracking with natural fibers - kenaf, abaca, coir, jute and sisal
    Item type: Journal Article
    Lura, Pietro; Toropovs, Nikolajs; Justs, Janis; et al. (2025)
    Cement and Concrete Composites
    In this study, a number of different fibers - namely kenaf, jute, abaca, coir and sisal - were investigated as natural alternatives to polypropylene (PP) fibers for reducing plastic shrinkage cracking. The risk of plastic shrinkage cracking of mortars with water-to-cement ratio 0.5 containing either 0.6 or 0.9 kg/m3 of natural fibers was assessed according to the ASTM C1579-21 standard and compared with plain mortars and mortars with PP fibers. The water absorption of the natural fibers was low enough that (at the employed dosages) the effect on the workability and on other fresh properties was small. The natural fibers also had no measurable influence on cement hydration in the examined mortars, as revealed by isothermal calorimetry. The best performance in reducing the width of plastic shrinkage cracks was shown by kenaf and jute fibers at the dosage of 0.6 kg/m3, which outperformed even a higher dosage of PP fibers (0.9 kg/m3). Kenaf fibers in pellets, which are advantageous for dosing and mixing, performed similarly as loose fibers. The distribution of both loose and pelletized kenaf fibers in the mortars was studied by X-ray tomography, showing no substantial difference between the two ways of delivering the fibers.
  • Experimental and numerical study of strain distributions and shear lag effects in FRP tendon pull-out experiments
    Item type: Journal Article
    Ott, Valentin; Wyrzykowski, Mateusz; Lura, Pietro; et al. (2025)
    Cement and Concrete Composites
    In the present study, sand-coated carbon fiber reinforced polymer (CFRP) tendons were instrumented with integrated optical fibers. The direct integration during manufacturing did not affect the bond between tendon and concrete and resulted in an excellent measurement quality. The tendons were cast into concrete cubes with different embedment lengths of 5, 10 and 15 times the diameter. The bond between tendon and concrete was tested using direct pull-out tests. Not only the force and the end-slip were measured but also the strain distribution in the tendon. This allowed to derive a position-dependent local bond–slip curve. Significant deviations from the commonly measured average bond-stress vs. end-slip relationship were observed for long and short embedment lengths. A complementary finite element study confirmed that average bond-stress vs. end-slip curves cannot properly predict the strain distribution in pull-out experiments, especially for longer embedment lengths. This allows to conclude that strain distributions are highly affected by local effects, e.g. partial pull-out failure of the concrete. In addition, shear lag was identified as additional parameter affecting the measurements of optical fibers when integrated in materials with low shear stiffness. The shear lag is highly dependent on the radial and axial position and further affected by the tendon material, the diameter of the tendon and the magnitude of the shear stress.
Publications 1 - 10 of 48