Robust production of sustainable concrete through the use of admixtures and in-transit concrete management systems

Berodier, Elise; Gibson, Larry R.; Burns, Elizabeth G.; Roberts, Lawrence R.; Cheung, Josephine

doi:10.1016/j.cemconcomp.2018.01.008

Cited by 21 publications

(10 citation statements)

References 38 publications

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“…They may also affect the hydration reaction in the induction period and modify therefore the structuration at rest of the fresh suspension and the associated evolutions in yield stress and elastic modulus (see Section 2.2.). As for most of the admixtures that have the ability to adsorb on cement particles, PCEs, for example, affect hydration by delaying the setting and disturbing the chemical balance between the cement phases (Cheung et al, 2011), (D. Marchon and R.J. Flatt, 2015), (L. Berodier et al, 2018), (Jansen et al, 2012). Among them, C 3 S and C 3 A are the most reactive and therefore the most relevant phases regarding the influence of their hydration on the evolution of the rheological properties.…”

Section: Admixtures Hydration and Structurationmentioning

confidence: 99%

“…However, the challenge is to choose the perfect mixture proportions between the different systems that are available to avoid an uncontrolled expansion or to not disturb the balance between the main phases of the system. Indeed, provoking ettringite nucleation or having a high aluminate content might strongly influence the sulfate consumption and silicate hydration (Cheung et al, 2011) (L. Berodier et al, 2018. In term of chemistry of hydration, the sulfate depletion is strongly accelerated and if it occurs before the strong precipitation of C-S-H, the presence of a very high content of aluminum in the pore solution inhibits the dissolution of the silicate phase and therefore delays the precipitation of C-S-H that is the source of the mechanical strength (N. Tenoutasse, 1968), (E. Pustovgar et al, 2017).…”

Section: Admixtures Hydration and Structurationmentioning

confidence: 99%

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Recent advances on yield stress and elasticity of fresh cement-based materials

Roussel¹,

Bessaies-Bey²,

Kawashima

et al. 2019

Cement and Concrete Research

152

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The interest in the elastic and yielding properties of fresh cement-based materials has recently grown due to the development of new processing techniques, which avoid the use of standard formworks. Without support, the material shaping relies only on the mechanical properties of the fresh material. Within this frame, the point of this paper is to gather the accepted knowledge along with the most recent advances on both yield stress and elasticity of fresh cement-base materials. In the first part, we will go through the physical and chemical origin of these macroscopic properties and their evolutions. In the second part, we will describe the way they can be measured while the third part will deal with the way they can be controlled and tuned. Finally, the most recent models for both properties prediction from mix design and processing modeling from rheological measurements will be described.

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Section: Admixtures Hydration and Structurationmentioning

confidence: 99%

Section: Admixtures Hydration and Structurationmentioning

confidence: 99%

Recent advances on yield stress and elasticity of fresh cement-based materials

Roussel¹,

Bessaies-Bey²,

Kawashima

et al. 2019

Cement and Concrete Research

152

View full text Add to dashboard Cite

show abstract

“…Concrete, next to steel, is one of the most popular structural materials. Over the years, various modifications to concrete’s composition have been proposed in order to improve its properties, (e.g., [10,11,12,13]). Lowering the carbon footprint of concrete can be achieved, for example, by replacing cement with supplementary cementitious materials [14,15], using recycled aggregate [16,17,18] or enhancing its long-term durability.…”

Section: Introductionmentioning

confidence: 99%

Does a High Amount of Unhydrated Portland Cement Ensure an Effective Autogenous Self-Healing of Mortar?

et al. 2019

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It is commonly accepted that the autogenous self-healing of concrete is mainly controlled by the hydration of Portland cement and its extent depends on the availability of anhydrous particles. High-performance (HPCs) and ultra-high performance concretes (UHPCs) incorporating very high amounts of cement and having a low water-to-cement ratio reach the hydration degree of only 70–50%. Consequently, the presence of a large amount of unhydrated cement should result in excellent autogenous self-healing. The main aim of this study was to examine whether this commonly accepted hypothesis was correct. The study included tests performed on UHPC and mortars with a low water-to-cement ratio and high cement content. Additionally, aging effects were verified on 12-month-old UHPC samples. Analysis was conducted on the crack surfaces and inside of the cracks. The results strongly indicated that the formation of a dense microstructure and rapidly hydrating, freshly exposed anhydrous cement particles could significantly limit or even hinder the self-healing process. The availability of anhydrous cement appeared not to guarantee development of a highly effective healing process.

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“…Esses resíduos podem ser incorporados em pastas de cimento, argamassas e concretos, caso seja compatível no sistema, visto que, é uma mistura que absorve diversos tipos de materiais. Com isso, há tendência de produzir cada vez mais materiais cimentícios sustentáveis utilizando materiais alternativos (JIN, CHEN, e SOBOYEJO, 2015;BERODIER et al, 2018). Empresas dos EUA responsáveis por estudos acerca de concretos sustentáveis revelam que os principais objetivos são a utilização de materiais cimentícios suplementares (SCMs) e agregados alternativos (AA) (JIN, CHEN, e SOBOYEJO, 2015).…”

Section: Referênciasunclassified

“…Empresas dos EUA responsáveis por estudos acerca de concretos sustentáveis revelam que os principais objetivos são a utilização de materiais cimentícios suplementares (SCMs) e agregados alternativos (AA) (JIN, CHEN, e SOBOYEJO, 2015). Destaca-se que outro fator importante na produção de concretos sustentáveis, além dos ambientais, está a diminuição do custo (BERODIER et al, 2018), visto que, os materiais incorporados em argamassas e concretos são na maioria dos casos resíduos.…”

Section: Referênciasunclassified