Mechanical properties and microstructure of reactive powder concrete using ternary pozzolanic materials at elevated temperature

So, Hyoung-Seok; Jang, Hyung‐Kwan; Khulgadai, Janchivdorj; So, Seungyoung

doi:10.1007/s12205-015-0015-y

Cited by 37 publications

(12 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Beginning from this temperature, broadband of DTG curve started to form, with a peak at 700 • C. This broad peak can be attributed to the de-carbonation of CaCO 3 accompanied by solid-solid transformations [36]. The exothermic peak at 860-875 • C indicates a phase transformation to wollastonite (CaSiO 3 ) [37][38][39].…”

Section: Tga Findingsmentioning

confidence: 98%

Hydration heat, strength and microstructure characteristics of UHPC containing blast furnace slag

Yalçınkaya

Çopuroğlu

2021

Journal of Building Engineering

View full text Add to dashboard Cite

Ultra-high performance concrete (UHPC) is an innovative cement-based composite with high mechanical performance under tensile and compressive loads, extremely low permeability, and excellent durability. Because of these features, UHPC has the potential to contribute to the development of new architectural perspectives and structural systems with prolonged service life; therefore, it is anticipated that the use of UHPC in cast-in-situ applications will increase in the near future. As a result of its high Portland cement dosage, the hydration heat of UHPC can be relatively high compared to that of conventional concrete. Thus, ground granulated blast furnace slag (GGBS) can be used in UHPC formulation for reducing Portland cement dosage thereby limiting hydration heat while also addressing ecological and engineering concerns. In the scope of this study, the effects of GGBS replacement (0%, 30%, and 60%) on the hydration heat, strength, and microstructural characteristics of UHPC were studied. Results showed that GGBS-bearing UHPCs are more sensitive to ambient temperature in respect to cumulative heat. 60% GGBS replacement reduced cumulative heat release by 36% and 28% at 20 • C and 35 • C respectively. So, the benefit of GGBS on reducing hydration heat is less pronounced in hot weather. Performance differences in strength depending on the replacement ratio were only noticeable on the first day of curing. Prolonged curing time and fiber inclusion eliminated strength differences. Microstructural investigations indicated that Ca(OH) 2 can be lowered up to 0.5%, and the Ca/Si ratio of the C-S-H phase was reduced below the value of 1.0 after 90 days of curing as a result of GGBS replacement.

show abstract

Section: Tga Findingsmentioning

confidence: 98%

Hydration heat, strength and microstructure characteristics of UHPC containing blast furnace slag

Yalçınkaya

Çopuroğlu

2021

Journal of Building Engineering

View full text Add to dashboard Cite

show abstract

“…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]. Recently, several studies found out that the incorporation of proper dosage of polypropylene (PP) fibers, steel fibers, and hybrid combination (PP + steel) of fibers prevents explosive spalling [24,25,26]. PP fibers leave micro-channels after melting at nearly 167 °C, through which the trapped vapors could be released resulting in a decrease in the vapor pressure [26].…”

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

“…Stosowano także dodatki mineralne do cementu w postaci drobno zmielonych popiołów lotnych i żużli wielkopiecowych (11)(12)(13)(14)(15)(16)(17)(18)(19).…”

Section: Discussionunclassified

Reactive powder concrete with the blastfurnace slag cement

Janus

Grzeszczyk

2020

Cem. Wapno Beton

View full text Add to dashboard Cite

The paper presents the results of tests of the reactive powder concrete [RPC] obtained from the CEM III/A 42.5 N LH/HSR/NA blast furnace slag cement, containing about 60 % of granulated blast furnace slag. The optimisation of the concrete mix composition, aimed at obtaining the largest particle packing in the composite, was carried out based on Funk’s optimal particle size distribution curve. A low water to binder ratio of 0.2 was obtained by using a superplasticiser based on polycarboxylates. It has been shown that it is possible to obtain, under normal conditions, RPC with the use of slag cement, containing 2.0% vol. of steel fibres, with a compressive strength of about 200 MPa and a flexural strength of about 57 MPa, after 180 days of curing. The water absorption of this concrete is only 2.4%, and the results of freeze-thaw resistance tests allow to assessing the freeze-thaw resistance of this concrete as very good, according to the standard SS 13 72 44. RPC has a compact microstructure and the identified C-S-H phase shows a low C/S ratio.

show abstract

Mechanical properties and microstructure of reactive powder concrete using ternary pozzolanic materials at elevated temperature

Cited by 37 publications

References 16 publications

Hydration heat, strength and microstructure characteristics of UHPC containing blast furnace slag

Hydration heat, strength and microstructure characteristics of UHPC containing blast furnace slag

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

Reactive powder concrete with the blastfurnace slag cement

Contact Info

Product

Resources

About