Influence of Ultrafine 2CaO·SiO2 Powder on  Hydration Properties of Reactive Powder Concrete

Sun, Hongfang; Li, Zishanshan; Memon, Shazim Ali; Zhang, Qiwu; Wang, Yaocheng; Liu, Bing; Xu, Weiting; Xing, Feng

doi:10.3390/ma8095300

Cited by 17 publications

(11 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, the scope of these design codes is limited to traditional concrete types and the relatively new type of materials including RPC are not covered in it. However, in the last decade, extensive studies were reported for RPC and UHPC, especially at ambient temperature [18,19,20,21]. In spite of a promising material at ambient temperature, fire-induced spalling limits its application to buildings and the current design codes allows us to use only up to Class C90/105 for concrete structures [14,22,23].…”

Section: Introductionmentioning

confidence: 99%

Effect of Fibers on High-Temperature Mechanical Behavior and Microstructure of Reactive Powder Concrete

et al. 2019

View full text Add to dashboard Cite

This study was aimed to investigate the effect of steel, polypropylene (PP), and hybrid (steel + PP) fibers on high-temperature mechanical properties of reactive powder concrete (RPC). The mechanical properties considered are cubic compressive strength, axial or prismatic compressive strength, split-tensile strength, flexural strength, elastic modulus, peak strain, and stress-strain behavior. The strength recession due to high temperature was investigated at micro level by scanning electron microscope, energy dispersive X-ray spectroscopy, X-ray diffraction, mercury intrusion porosity, thermogravimetric, and differential scanning calorimetry analyses. The high-temperature tests were carried out at target temperatures of 120, 300, 500, 700, and 900 °C. The hot-state compressive strength of RPC started to decrease at 120 °C; however, a partial recovery at 300 °C and a gradual decrease above 300 °C were observed. The degradation of split-tensile strength, flexural strength, and elastic modulus were gradual with increasing temperature despite the effect of different fibers. Whereas, the peak strain was gradually increasing up to 700 °C. However, after 700 °C, it remained unchanged. Steel fiber reinforced RPC (SRPC) and hybrid fiber reinforced RPC (HRPC) showed a ductile behavior. PP fiber reinforced RPC (PRPC) showed a quite brittle behavior up to 300 °C; however, further heating made the microstructure porous and it became ductile too. Overall the performance of SRPC and HRPC were superior to PRPC because of higher modulus of elasticity, higher strength, and better fire resistance of steel fibers. Fiber reinforced RPC was found to have better fire resistance than traditional types of concrete based on comparative studies with the provisions of design codes and earlier research. The constitutive equations developed can be utilized in computer programs for structural design of RPC structures exposed to fire.

show abstract

Section: Introductionmentioning

confidence: 99%

Effect of Fibers on High-Temperature Mechanical Behavior and Microstructure of Reactive Powder Concrete

et al. 2019

View full text Add to dashboard Cite

show abstract

“…Similar results of reduced setting time were obtained in [28], where nano-TiO2 was added to the cement composites. The results presented by [29] showed that the setting time can also be delayed by adding 2CaO⋅SiO2 nanoparticles to the concrete. The literature and the obtained results confirm that the nanoparticles have an impact on the setting time of concrete or cementitious composites.…”

Section: Methodsmentioning

confidence: 99%

Attempts to Improve the Subsurface Properties of Horizontally-Formed Cementitious Composites Using Tin(II) Fluoride Nanoparticles

et al. 2020

View full text Add to dashboard Cite

This article presents studies that were performed in order to improve the subsurface properties of horizontally-formed cementitious composites using tin(II) fluoride nanoparticles. The main aim of the study was to solve the problem of the decrease in subsurface properties caused by mortar bleeding and the segregation of the aggregate along the height of the overlay. The article also aims to highlight the patch grabbing difficulties that occur during the process of forming horizontally-formed cementitious composites. Four specimens were analyzed: one reference sample and three samples modified with the addition of 0.5, 1.0, and 1.5% of tin(II) fluoride nanoparticles in relation to the cement mass. To analyze the mechanical properties of the specimens, non-destructive (ultrasonic pulse velocity) and destructive tests (flexural tensile strength, compressive strength, abrasion resistance, pull-off strength) were performed. It was indicated that due to the addition of the tin(II) fluoride, it was possible to enhance the subsurface tensile strength and abrasion resistance of the tested cementitious composites. To confirm the obtained macroscopic results, the porosity of the subsurface was measured using SEM. It was also shown that the addition of the tin(II) fluoride nanoparticles did not reduce its flexural and compressive strength. The results show that horizontally-formed cementitious composites with the addition of 1.0% of tin(II) fluoride nanoparticles in relation to the cement mass obtained the most effective mechanical performance, especially with regard to subsurface properties.

show abstract

“…Hence, complex structural and internal loading conditions require the piles to be made of superior performance material such as ultra-high performance concrete (Tulebekova et al, 2019). Reactive Powder Concrete (RPC) is a type of ultra-high performance concrete that is obtained by removing coarse aggregates from and addition of pozzolanic materials like silica fume (SF) to the concrete along with very low waterto-binder ratio (w/b) (Sun et al, 2015). RPC has a densified microstructure that is attributed to the removal of coarse aggregates and the pozzolanic reaction that lead to the formation of strong bonds in interfacial transition zone due to the increased formation of strong calcium silicate hydrate lattices (Beglarigale and Yazıcı, 2015).…”

Section: Introductionmentioning

confidence: 99%

Statistical Analysis of Sulfate Attack Resistance of Reactive Powder Concrete

Bektimirova¹,

Sharafutdinov²,

Shon³

et al. 2020

XV International Conference on Durability of Building Materials and Components. eBook of Proceedings

View full text Add to dashboard Cite

This paper is the study of sulfate attack resistance of reactive powder concrete (RPC). RPC that is also known as ultra-high performance concrete is a special type of concrete material obtained when fine powders like silica fume (SF) are added into the concrete mortar along with very low waterto-binder ratio (w/b). SF is a pozzolanic material obtained as a by-product of silicon metal or ferrosilicon alloys production. In this study, total 6 different RPC mixtures with various w/b (0.18, 0.22 and 0.26) and various SF content were studied. SF was added into the concrete mixtures in the amount of 15%, 20% and 25% of cement by weight. The other testing parameter includes 3 different concentrations of sodium sulfate (Na2SO4) solutions (0.35 M, 0.7 M and 1.4 M concentrations). Broad laboratory investigations of behavior of the RPC mixtures were conducted in terms of compressive strength and mass gain of cubes (50×50×50 mm 3) and expansion and mass change as in accordance with ASTM C1012. Test results had been analyzed and assessed by Taguchi method. The significance level of experimental parameters was determined by using Analysis of variance (ANOVA) method. According to statistical and analytical results it was observed that RPC has high sulfate attack resistance. Moreover, addition of optimal amount of SF into the RPC mixtures as well as decreasing w/b can significantly improve Na2SO4 resistance of RPC.

show abstract

Influence of Ultrafine 2CaO·SiO2 Powder on Hydration Properties of Reactive Powder Concrete

Cited by 17 publications

References 25 publications

Effect of Fibers on High-Temperature Mechanical Behavior and Microstructure of Reactive Powder Concrete

Effect of Fibers on High-Temperature Mechanical Behavior and Microstructure of Reactive Powder Concrete

Attempts to Improve the Subsurface Properties of Horizontally-Formed Cementitious Composites Using Tin(II) Fluoride Nanoparticles

Statistical Analysis of Sulfate Attack Resistance of Reactive Powder Concrete

Contact Info

Product

Resources

About