Evolution of 112-day drying shrinkage equation of fly ash blended self-compacting concrete

AbstractThe main goal of the presented research was to verify the possibility of obtaining ecological self-compacting concrete of low hardening temperature, containing different types of cements with calcareous fly ash W as main component and the influence of these cements on basic properties of fresh and hardened concrete. Cements CEM II containing calcareous fly ash W make it possible to obtain self-compacting concrete (SCC) with similar initial flowability to analogous mixtures with reference cement CEM I and CEM III/B, and slightly higher, but still acceptable, flowability loss. Properties of hardened concretes with these cements are similar in comparison to CEM I and CEM III concretes. By using cement nonstandard, new generation multi-component cement CEM “X”/A (S-W), self-compacting concrete was obtained with good workability and properties in hardened state.

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Ternary Mixes of Self-Compacting Concrete with Fly Ash and Municipal Solid Waste Incinerator Bottom Ash

Applied Sciences ◽

10.3390/app11010107 ◽

2020 ◽

Vol 11 (1) ◽

pp. 107

Author(s):

B. Simões ◽

P. R. da Silva ◽

R. V. Silva ◽

Y. Avila ◽

J. A. Forero

Keyword(s):

Fly Ash ◽

Municipal Solid Waste ◽

Solid Waste ◽

Bottom Ash ◽

Chloride Diffusion ◽

Waste Incinerator ◽

Chloride Diffusion Coefficient ◽

Municipal Solid Waste Incinerator ◽

Self Compacting Concrete ◽

Solid Waste Incinerator

This study aims to evaluate the potential of incorporating fly ash (FA) and municipal solid waste incinerator bottom ash (MIBA) as a partial substitute of cement in the production of self-compacting concrete mixes through an experimental campaign in which four replacement levels (i.e., 10% FA + 20% MIBA, 20% FA + 10% MIBA, 20% FA + 40% MIBA and 40% FA + 20% MIBA, apart from the reference concrete) were considered. Compressive and tensile strengths, Young’s modulus, ultra-sonic pulse velocity, shrinkage, water absorption by immersion, chloride diffusion coefficient and electrical resistivity were evaluated for all concrete mixes. The results showed a considerable decline in both mechanical and durability-related performances of self-compacting concrete with 60% of substitution by MIBA mainly due to the aluminium corrosion chemical reaction. However, workability properties were not significantly affected, exhibiting values similar to those of the control mix.

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Evaluating the effect of different mix compositions and site curing methods on the drying shrinkage and early strength of pavement quality self-compacting concrete

International Journal of Pavement Research and Technology ◽

10.1007/s42947-021-00004-6 ◽

2021 ◽

Author(s):

Shashi Kant Sharma ◽

Kanish Kapoor ◽

Mohit Kumar ◽

Dadi Rambabu

Keyword(s):

Drying Shrinkage ◽

Self Compacting Concrete ◽

Curing Methods ◽

Early Strength

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Effect of Fly Ash on Compressive Strength, Drying Shrinkage, and Carbonation Depth of Mortar with Ferronickel-Slag Powder

Applied Sciences ◽

10.3390/app11031037 ◽

2021 ◽

Vol 11 (3) ◽

pp. 1037

Author(s):

Se-Jin Choi ◽

Ji-Hwan Kim ◽

Sung-Ho Bae ◽

Tae-Gue Oh

Keyword(s):

Compressive Strength ◽

Fly Ash ◽

Construction Industry ◽

Bituminous Coal ◽

Raw Materials ◽

Drying Shrinkage ◽

The Other ◽

Test Results ◽

Slag Powder ◽

Ferronickel Slag

In recent years, efforts to reduce greenhouse gas emissions have continued worldwide. In the construction industry, a large amount of CO2 is generated during the production of Portland cement, and various studies are being conducted to reduce the amount of cement and enable the use of cement substitutes. Ferronickel slag is a by-product generated by melting materials such as nickel ore and bituminous coal, which are used as raw materials to produce ferronickel at high temperatures. In this study, we investigated the fluidity, microhydration heat, compressive strength, drying shrinkage, and carbonation characteristics of a ternary cement mortar including ferronickel-slag powder and fly ash. According to the test results, the microhydration heat of the FA20FN00 sample was slightly higher than that of the FA00FN20 sample. The 28-day compressive strength of the FA20FN00 mix was approximately 39.6 MPa, which was higher than that of the other samples, whereas the compressive strength of the FA05FN15 mix including 15% of ferronickel-slag powder was approximately 11.6% lower than that of the FA20FN00 mix. The drying shrinkage of the FA20FN00 sample without ferronickel-slag powder was the highest after 56 days, whereas the FA00FN20 sample without fly ash showed the lowest shrinkage compared to the other mixes.

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Effect of CaSO4 Incorporation on Pore Structure and Drying Shrinkage of Alkali-Activated Binders

Materials ◽

10.3390/ma12101673 ◽

2019 ◽

Vol 12 (10) ◽

pp. 1673 ◽

Cited By ~ 3

Author(s):

Hyeongmin Son ◽

Sol Moi Park ◽

Joon Ho Seo ◽

Haeng Ki Lee

Keyword(s):

Fly Ash ◽

Pore Structure ◽

Drying Shrinkage ◽

Phase Changes ◽

X Ray Diffraction ◽

Activated Slag ◽

Capillary Tension ◽

Alkali Activated Binders ◽

Internal Pore Structure ◽

Alkali Activated

This present study investigates the effects of CaSO4 incorporation on the pore structure and drying shrinkage of alkali-activated slag and fly ash. The slag and fly ash were activated at a 5:5 ratio by weighing with a sodium silicate. Thereafter, 0%, 5%, 10%, and 15% of CaSO4 were incorporated to investigate the changes in phase formation and internal pore structure. X-Ray Diffraction (XRD), thermogravimetry (TG)/derivative thermogravimetry (DTG), mercury intrusion porosimetry (MIP), nuclear magnetic resonance (NMR), and drying shrinkage tests were carried out to find the correlation between the pore structure and drying shrinkage of the specimens. The results showed that CaSO4 incorporation increased the formation of thenardite, and these phase changes affected the pore structure of the activated fly ash and slag. The increase in the CaSO4 content increased the pore distribution in the mesopore. As a result, the capillary tension and drying shrinkage decreased.

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