Influence of time addition of superplasticizers on the rheological properties of fresh cement pastes

Aiad, Ismail

doi:10.1016/s0008-8846(03)00037-1

Cited by 83 publications

(32 citation statements)

References 7 publications

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“…This is explained by several hypotheses such as inhibition of dissolution, inhibition of nucleation and growth, deactivation of active sites, and complex formation between the admixture and calcium that would modify diffusion rates [16,17]. Sometimes superplasticizers are added after a small delay, from 5 to 30 min after the addition of water, and this can cause drastic differences in the performance of the superplasticizer, for complex reasons [18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Use of micro-reactors to obtain new insights into the factors influencing tricalcium silicate dissolution

Suraneni

Flatt

2015

Cement and Concrete Research

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Section: Introductionmentioning

confidence: 99%

Use of micro-reactors to obtain new insights into the factors influencing tricalcium silicate dissolution

Suraneni

Flatt

2015

Cement and Concrete Research

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“…This is mainly attributed to the presence of the Sod. lignosulfonate admixture which is the main responsible factor for reducing the amount of mixing water [34][35][36][37]. Moreover, the higher fineness of the SDA (63 µm) compared to that of the OPC (3350 cm 2 /g) caused to decrease the amount of mixing water slightly [18,34,36].…”

Section: Water Of Consistency and Setting Timesmentioning

confidence: 99%

“…Also, the setting times (initial and Final) also decreased gradually as the SDA content increased. This is primarily due to the high pozzolanic reactivity of the SDA with the evolved free lime coming from the hydration of the di-and tricalcium silicates phases of the cement [28,[33][34][35][36][37][38]. …”

Section: Water Of Consistency and Setting Timesmentioning

confidence: 99%

Saw Dust Ash Substitution for Cement Pastes-Part I

Darweesh¹,

El-Suoud²

2017

AJASR

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Abstract:The saw dust (SD) is often used as a fuel which in turn leads to the environmental pollution. So, it must utilize this waste into useful applications to avoid what is known as "air pollution". In this study, the SD was converted to saw dust ash (SDA) by its firing at 500°C. It is then used as a partial substitution for cement. The results showed that the water of consistency (WC), initial setting time (IST) and final setting time (FST) of the Portland cement pastes are decreased with the substitution of SDA due to the presence of Na-lignosulfonate. The bound water content (BW), bulk density (BD) and compressive strength (CS) increased with time of hydration up to 90 days, while the apparent porosity (AP) decreased. The BW, BD and CS of the cement pastes containing 5-15 wt. % SDA are slightly higher than those of the blank (S0) at all hydration ages. The free lime content (FL) of the Portland cement pastes (S0) increased as the hydration progressed onward, whereas the cement pastes with SDA (S1-S5) only increased up to 3 days and then decreased. The FTIR spectra of the OPC without SDA showed that the free lime content increased as the hydration proceeded till 90 days, while that of the optimum cement mix containing 15 wt. % SDA, the FL content increased only up to 3 days and then progressively decreased until nearly disappeared after 90 days.

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“…Les polymères affectent l'interface entre la surface des particules et la solution interstitielle et influencent les propriétés physiques telles que la viscosité et la limite d'élasticité de la pâte [12,13]. Les superplastifiants à base de naphtalène et de mélamine augmentent les propriétés rhéologiques des pâtes de ciment à court et à long termes à cet effet la réduction de la viscosité plastique et le seuil de cisaillement dépendent de la composition du ciment et du temps d'introduction du superplastifiant [14]. Ainsi le type de superplastifiant à une grande influence sur le comportement rhéologique des mortiers de ciment à l'état frais et que les superplastifiants à base de polycarboxylate étaient plus efficaces que les superplastifiants à base de naphtalène [15,13].…”

Section: Introductionunclassified

Effect of cement fineness and polycarboxylate dosage on the rheological and mechanical behavior of a mortar

Zahia

Ezziane

2018

MATEC Web Conf.

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Abstract. The use of certain organic additives in the production of mortar and concrete influences the workability and the hydration kinetic of mortar. This results in a modification of some properties, namely rheological behavior and mechanical strength. The objective of this work is to evaluate the rheological and mechanical behavior of a mortar by varying the fineness of the cement and using the superplasticizer Polycarboxylate.

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Influence of time addition of superplasticizers on the rheological properties of fresh cement pastes

Cited by 83 publications

References 7 publications

Use of micro-reactors to obtain new insights into the factors influencing tricalcium silicate dissolution

Use of micro-reactors to obtain new insights into the factors influencing tricalcium silicate dissolution

Saw Dust Ash Substitution for Cement Pastes-Part I

Effect of cement fineness and polycarboxylate dosage on the rheological and mechanical behavior of a mortar

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