Multi-level micromechanical analysis of elastic properties of ultra-high performance concrete at high temperatures: Effects of imperfect interface and inclusion size

Zhang, Tong; Zhu, Hehua; Zhou, Long; Yan, Zhiguo

doi:10.1016/j.compstruct.2021.113548

Cited by 21 publications

(10 citation statements)

References 53 publications

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“…This can be explained by the presence of carbonaceous fillers, e.g., calcite (CaCO 3 ) and/or dolomite (CaMg(CO 3 ) 2 ), or periclase (MgO). However, from a mineralogical point of view, it is relevant that the cement used for the production of HPC must present higher amounts of alite (C 3 S) and belite (C 2 S), which are the constituents of the OPC responsible for the formation of C-S-H, the main strength product of concrete [ 30 ]. Therefore, the CaO content must be analyzed coupled with the loss of ignition value, since this element can be present either as calcium silicate (i.e., C 3 S and C 2 S) or calcium carbonate filler.…”

Section: Classic Components Used For Hpc and Uhpc Productionmentioning

confidence: 99%

“…The UHPC, on the other hand, presents even greater requirements. Some authors suggest a minimum strength of 120 MPa [ 13 , 29 ], while others stipulate a minimum of 150 MPa [ 30 , 31 ], with a fluidity equivalent or greater than HPC, in addition to low porosity. In theory, a concrete that presents a strength above class II could be considered a concrete with a mechanical performance superior to HSC or HPC.…”

Section: Introductionmentioning

confidence: 99%

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Materials for Production of High and Ultra-High Performance Concrete: Review and Perspective of Possible Novel Materials

Marvila¹,

Azevedo²,

Matos

et al. 2021

Materials

110

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This review article proposes the identification and basic concepts of materials that might be used for the production of high-performance concrete (HPC) and ultra-high-performance concrete (UHPC). Although other reviews have addressed this topic, the present work differs by presenting relevant aspects on possible materials applied in the production of HPC and UHPC. The main innovation of this review article is to identify the perspectives for new materials that can be considered in the production of novel special concretes. After consulting different bibliographic databases, some information related to ordinary Portland cement (OPC), mineral additions, aggregates, and chemical additives used for the production of HPC and UHPC were highlighted. Relevant information on the application of synthetic and natural fibers is also highlighted in association with a cement matrix of HPC and UHPC, forming composites with properties superior to conventional concrete used in civil construction. The article also presents some relevant characteristics for the application of HPC and UHPC produced with alkali-activated cement, an alternative binder to OPC produced through the reaction between two essential components: precursors and activators. Some information about the main types of precursors, subdivided into materials rich in aluminosilicates and rich in calcium, were also highlighted. Finally, suggestions for future work related to the application of HPC and UHPC are highlighted, guiding future research on this topic.

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Section: Classic Components Used For Hpc and Uhpc Productionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Materials for Production of High and Ultra-High Performance Concrete: Review and Perspective of Possible Novel Materials

Marvila¹,

Azevedo²,

Matos

et al. 2021

Materials

110

View full text Add to dashboard Cite

show abstract

“…33 Based on experimental observations, 51,67 varying gel packing densities ranging from 60% (wherein 64% is typically associated with low-density C-S-H) to 80% (wherein 74% is typically associated with high-density C-S-H) are considered. 10,[71][72][73] Figure 9 shows the sorption isotherms of C-S-H gels with varying packing densities as a function of RH. Overall, we observe that the computed sorption isotherms tend to shift toward lower RH values with increasing packing density values.…”

Section: Effect Of the Packing Density Of The C-s-h Gel On The Sorption Isothermmentioning

confidence: 99%

Deconstructing water sorption isotherms in cement pastes by lattice density functional theory simulations

et al. 2021

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The moisture content in cement pastes influences their mechanical properties and durability. However, the complex, multiscale nature of cement pastes makes it challenging to isolate the contributions of each scale to their macroscopic water sorption isotherms. In particular, the contribution of the calcium-silicate-hydrate gel (the binding phase of cement pastes) remains only partially understood. Here, we introduce a density functional theory lattice model describing water sorption in calciumsilicate-hydrate, which properly reproduces experimental water sorption isotherms in cement pastes. Based on this model, we deconstruct the contribution of each pore scale (interlayer spacing, gel pores, and capillary pores) to the total sorption isotherm.We show that, when the relative humidity is below 80%, the calcium-silicate-hydrate gel accounts for more than 90% of the moisture content adsorbed in cement pastes. In turn, we find that the contribution of the interlayer space within the calcium-silicatehydrate grains is governed by the competition between the rate of interlayer space opening and the increasing propensity for water to fill larger pores upon increasing relative humidity. Overall, our results highlight the key role played by the calciumsilicate-hydrate in governing the sorption isotherms of cement pastes.

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“…In the service process of CFST column structures, local corrosion and concrete cavitation often occur due to external actions, such as long-term loading and environmental corrosion, or internal action, such as concrete shrinkage and creep. Many scholars have investigated the influence of various defects on CFST structures (Han et al, 2012;Hou et al, 2016;Liao et al, 2011Liao et al, , 2013Xu et al, 2017;Zhang et al, 2020aZhang et al, , 2021. Han et al (2012) conducted an experimental study on square CFST columns under the conditions of long-term loading or chloride ion corrosion and concluded that the influence of long-term loading and chloride ion corrosion on CFST columns is high: the ductility and bearing capacity of CFST columns decreased by 29.8% and 31.7%, respectively.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Theoretical Study of Concrete-Filled Steel Tube Columns Strengthened by FRP/Steel Strips Under Axial Compression

Shi-chang

Miao

Wei

et al. 2023

Int J Concr Struct Mater

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Concrete-filled steel tube (CFST) columns are widely used in civil engineering because of their excellent bearing capacity; however, the reinforcement of CFST columns lacks effective measures. To strengthen CFST columns quickly and effectively, two methods, namely, winding FRP (fiber reinforced polymer) or steel strips, were explored in this work. Two unconfined CFST columns, eight FRP-strengthened CFST columns and four welded steel strip-strengthened CFST columns were manufactured and tested. The failure modes and axial load–strain curves of all specimens under compression load were concluded and compared. The effects of the primary parameters, such as FRP layers (1, 2, 3 and 4 layers) and steel strip thickness (3.0 and 6.0 mm), on the bearing capacity and deformation capacity were also investigated. The ultimate load of CFST columns increased from 28.72 to 64.16% after being confined by FRP with one to four layers. The ultimate load of the welded steel strip-strengthened CFST column with 3.0 mm steel strips and 6.0 mm steel strips increased by 28.46% and 49.82%, respectively, compared with the unconfined CFST column. Thus, the increase in FRP layers and steel strip thickness can markedly improve the compressive behavior of the FRP/welded steel strip-strengthened CFST columns. The cost performance of the two different reinforcement methods also showed that the cost of the welded steel strip-strengthened CFST column is nearly 40% of that of the FRP-strengthened CFST column when the same strengthening effect was obtained, which indicated that the welded steel strip-strengthened CFST column is more cost-efficient than CFST columns confined by FRP. Finally, six existing models for the ultimate load of FRP-strengthened CFST columns were presented and evaluated. From the evaluation results, the Zhang et al.’s model, Lu et al.’s model and Hu et al.’s model for FRP-strengthened CFST columns were shown to provide the best applicability and accuracy. Based on the Mander et al.’s model, a model for the ultimate load of welded steel strip-strengthened CFST columns was proposed and evaluated. The proposed model can accurately predict the ultimate load of welded steel strip-strengthened CFST columns.

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Multi-level micromechanical analysis of elastic properties of ultra-high performance concrete at high temperatures: Effects of imperfect interface and inclusion size

Cited by 21 publications

References 53 publications

Materials for Production of High and Ultra-High Performance Concrete: Review and Perspective of Possible Novel Materials

Materials for Production of High and Ultra-High Performance Concrete: Review and Perspective of Possible Novel Materials

Deconstructing water sorption isotherms in cement pastes by lattice density functional theory simulations

Experimental and Theoretical Study of Concrete-Filled Steel Tube Columns Strengthened by FRP/Steel Strips Under Axial Compression

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