Application of the C-S-H Phase Nucleating Agents to Improve the Performance of Sustainable Concrete Composites Containing Fly Ash for Use in the Precast Concrete Industry

Golewski, Grzegorz Ludwik; Szóstak, Bartosz

doi:10.3390/ma14216514

Cited by 64 publications

(16 citation statements)

References 83 publications

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“…Production and construction have a point of contact in the form of production of building materials, products, and structures. There are several works devoted primarily to solving environmental and economic problems through the disposal of various types of waste by using them in building materials [3,5,[12][13][14][15][16]19,[25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40]. In addition, there are works related to the improvement of the properties of composite building materials, products, structures, and first, concretes due to their nano-modification [41][42][43][44][45][46][47][48][49][50][51][52][53][54][55].…”

Section: Characteristics Of Concretes and Mortarsmentioning

confidence: 99%

Enhanced Eco-Friendly Concrete Nano-Change with Eggshell Powder

et al. 2022

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One of the unifying factors for all countries is the large consumption of chicken, and other, eggs in food and other types of economic activity. After using various types of eggs for their intended purpose, a large amount of waste accumulates in the form of eggshells. Currently, this problem exists and needs a non-trivial, original solution. The aim of the work was to fill the scientific gap in the direction of studying the microstructure formation of improved nano-modified environmentally-friendly concrete based on eggshell powder and obtaining a concrete composition for the manufacture of an industrial sample of such a material. An environmentally-friendly concrete was obtained, the characteristics of which were improved relative to standard concrete by modifying it with eggshell powder, for which the optimal dosage was determined. The most effective was the replacement of part of the cement with eggshell powder in the amount of 10%. The maximum increase in strength characteristics ranged from 8% to 11%. The modulus of elasticity increased by 4% compared to the control samples without eggshell powder. The maximum reduction in deformations under axial compression and tension in comparison with the control values ranged from 5% to 10%. The study of the composite’s microstructure nano-modified with eggshell powder, and an analysis of the changes occurring in this microstructure due to nano-modification, confirmed the improvement in characteristics and the optimal dosage of eggshell powder.

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Section: Characteristics Of Concretes and Mortarsmentioning

confidence: 99%

Enhanced Eco-Friendly Concrete Nano-Change with Eggshell Powder

et al. 2022

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“…Therefore, in order to reduce the negative environmental impact of only-OPC-based concrete production, measures have been taken to reduce the share of pure Portland clinker in the composition of cement by replacing it with other mineral components in the form of additives [ 20 , 21 , 22 , 23 , 24 ], and recently, also nanoadditives [ 5 , 25 , 26 , 27 , 28 , 29 ]. Such materials are generally referred to as supplementary cementitious materials (SCMs) [ 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 ].…”

Section: Introductionmentioning

confidence: 99%

Fracture Performance of Cementitious Composites Based on Quaternary Blended Cements

Golewski

2022

Materials

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This study presents test results and in-depth discussion regarding the measurement of the fracture mechanics parameters of new concrete composites based on quaternary blended cements (QBC). A composition of the two most commonly used mineral additives, i.e., fly ash (FA) and silica fume (SF), in combination with nanosilica (nS), has been proposed as a partial replacement for ordinary Portland cement (OPC) binder. Four series of concrete were made, one of which was the reference concrete (REF) and the remaining three were QBC. During the research, the main mechanical parameters of compressive strength (fcm) and splitting tensile strength (fctm), as well as fracture mechanics parameters and the critical stress intensity factor (KIcS), along with critical crack-tip opening displacements (CTODc) were investigated. Based on the tests, it was found that the total addition of siliceous materials, i.e., SF + nS without FA, increases the strength and fracture parameters of concrete by approximately 40%. On the other hand, supplementing the composition of the binder with SF and nS with 5% of FA additive causes an increase in all mechanical parameters by approximately 10%, whereas an increase by another 10% in the FA content in the concrete mix causes a significant decrease in all the analyzed factors by 10%, compared to the composite with the addition of silica modifiers only.

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“…Still, it simultaneously reduced the early strength of concrete [ 24 ]. In [ 25 ] Golewski and Szostak proposed the application of a specifically formulated chemical nano-admixture in the grains form of C-S-H phase particles to increase the early strength of concretes with the addition of fly ash.…”

Section: Introductionmentioning

confidence: 99%

Effect of Aggregate Type on Properties of Ultra-High-Strength Concrete

2022

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In this work, we present an analysis of natural fine aggregates’ influence on the properties of ultra-high-strength concrete. The reference concrete mix was made of natural sand with the addition of fly ash and microsilica. It was assumed to obtain concrete with a very high strength without the addition of fibers and without special curing conditions, ensuring the required workability of the concrete mix corresponding to the consistency of class S3. The reference concrete mix was modified by replacing sand with granite and basalt aggregate in the same fractions. Five series of concrete mixes made with CEM I 52.5R cement were tested. Experimental investigations were carried out regarding the consistency of the concrete mix, the compressive strength, the flexural strength and the water absorption by hardened concrete. A comparative analysis of the obtained results indicated significant improvement in the concrete strength after the use of basalt aggregate. The strength of the concrete series based on basalt aggregate, BC1, allowed it to be classified as ultra-high-performance concrete. Concrete based on sand, SC1, was characterized by the lowest compressive and flexural strength but obtained the best workability of the mix and the lowest water absorption. The results presented in the paper, show a significant influence of the type of aggregate used on the mechanical and physical properties of ultra-high strength concrete.

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Application of the C-S-H Phase Nucleating Agents to Improve the Performance of Sustainable Concrete Composites Containing Fly Ash for Use in the Precast Concrete Industry

Cited by 64 publications

References 83 publications

Enhanced Eco-Friendly Concrete Nano-Change with Eggshell Powder

Enhanced Eco-Friendly Concrete Nano-Change with Eggshell Powder

Fracture Performance of Cementitious Composites Based on Quaternary Blended Cements

Effect of Aggregate Type on Properties of Ultra-High-Strength Concrete

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