Rheological Behavior and Microstructure Characteristics of SCC Incorporating Metakaolin and Silica Fume

To explore the influence of fly ash (FA) and silica fume (SF) on the mechanical properties of self-compacting concrete (SCC) under uniaxial and triaxial, the compressive strength test, splitting strength test, ultrasonic testing test, and triaxial test were performed in this paper. The results show that the 3 days compressive strength and splitting strength of SCC decreased with the increase of FA substitution rate. The 28 days, 56 days, and 91 days compressive strength and splitting strength of SCC increased first and then decreased with the increase of FA substitution rate. The peak stress and peak strain of SCC gradually increased with the increase of confining pressure. The peak stress and strain of SCC increased first and then decreased with the increase of FA substitution rate. Moreover, the relationship models between compressive strength and splitting strength, between compressive strength and amplitude, between peak stress, peak strain and confining pressure under different FA substitution rates were proposed. As a conclusion, the addition of SF can increase the strength of SCC obviously. Under uniaxial stress, SCC failure mode is splitting failure, under triaxial stress, SCC failure mode is shear failure. Based on the Mohr-Coulomb strength theory, the failure criterion of SCC with FA and SF was discussed.

“…Bring Equation (10) into Equation (9), the relation of peak stress and confining pressure of SCC shown in Equation (11) can be obtained.…”

Section: Specimen Number γ (%)mentioning

confidence: 99%

Section: Peak Strainmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Experimental Investigation on the Mechanical Properties of Self-Compacting Concrete under Uniaxial and Triaxial Stress

Yin

Yan

et al. 2020

“…Nevertheless, a few experimental results of the mechanical behaviors of SCC under cyclic direct tension have been reported in the literature [2,3,4,5,6,7,8,9,10,11,12,13]. Specifically, initially, several researches focused on studying mechanical behaviors under cyclic compression.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Mechanical Behaviors of Self-Compacting Concrete under Cyclic Direct Tension

Shan

Chen

et al. 2019

Self-compacting concrete (SCC) is increasingly applied in the construction industries dueto its advantages of outstanding workability and eco-friendliness. However, few experimentalstudies on the mechanical behaviors of SCC under cyclic direct tension are available in theliterature. In this work, experimental investigations of mechanical behaviors of SCC under cyclicdirect tension were conducted. Especially, direct tensile load equipment was developed. It is foundthat the envelope stress-strain curve under cyclic direct tension is close to that under monotonicdirect tension; however, it is different from that in a compressive case. It is also revealed that theratio of unloading strain to irreversible strain is approximately linearly dependent on unloadingstrain. The evolutions of energy dissipation for SCC under both cyclic direct tension andcompression are similar to those of normally vibrated concrete. In addition, Poisson’s ratio isobserved to be nearly 0.21 for SCC. Furthermore, a damage model enabling characterization of thestress-strain curve under both monotonic and cyclic loading was proposed and verified againstexperimental results. Therefore, the results in this work provide original research material forstudying and modelling the mechanical behaviors of SCC under uniaxial cyclic direct tension.

“…In the latter article, modified polyvinyl alcohol fiber was added into engineered cementitious composites to enhance the mechanical performance. Research on self-compacting concrete [42], ultra-high performance concrete [43], cement paste plasticized by polycarboxylate superplasticizer [44], and pozzolanic additive in cement [45] were also discussed in this special issue.…”

mentioning

confidence: 99%

Special Issue of Environment-Friendly Construction Materials

Hoff

Amirkhanian

et al. 2019

This special issue, “Environment-Friendly Construction Materials”, has been proposed and organized as a means to present recent developments in the field of construction materials. For this reason, the articles highlighted in this editorial relate to different aspects of construction materials, from pavement materials to building materials, from material design to structural design, from self-healing to cold recycling, from asphalt mixture to cement concrete.