Effect of carboxymethyl-cellulose on the properties of cement

Mishra, P. C.; Singh, Vakil; Narang, K. K.; Singh, Nidhi

doi:10.1016/s0921-5093(02)00832-8

Cited by 51 publications

(29 citation statements)

References 9 publications

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“…For each additive, a dosage of 0.06% of the total dried mortar's weight was incorporated. This dosage was selected in line with those used in previous studies [1,[5][6][7]. The additives used were obtained from a supplier as commercial products: hydroxypropyl methylcellulose (HPMC) HK 15 M from Hercules and a guar gum derivative (GG), whose chemical composition was hydroxypropyl guaran, from Lamberti Quimica S.A. (ESACOL HS-30®).…”

Section: Methodsmentioning

confidence: 99%

“…In the present study, the same arguments could be brought to bear: both admixtures produced a decrease in the density of hardened material. However, Mishra et al [5] reported a rise in mechanical strengths when water-retaining agents were used in cement mortars. In their work, maximum mechanical strengths were reached over a longer period of time owing to the induced delay, but once they were reached, the values were higher than the reference ones.…”

Section: Mechanical Strengthsmentioning

confidence: 99%

“…In addition, another action of water-retaining agents consists of keeping the water in the mass over a longer period of time, which is supposed to improve cement hydration and, therefore, its mechanical strengths. A secondary effect of this role is a delay in the setting time of the mortar [1,2,5].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Characterization of aerial lime-based mortars modified by the addition of two different water-retaining agents

Izaguirre

Lanas²,

Álvarez

2011

Cement and Concrete Composites

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Two different commercial additives that have been reported to act as viscosity enhancing, water retaining admixtures, namely hydroxypropyl methylcellulose and a guar gum derivative, were added to lime-based mortars in order to test their performance. Different properties of lime-based mortars were evaluated: fresh mixture behaviour through water retention, air content and setting time; hardened mixtures properties such as density, shrinkage, water absorption through capillarity, water vapour permeability, long-term compressive strengths, pore structure through mercury intrusion porosimetry and durability assessed by means of freezing-thawing cycles.Hydroxypropyl methylcellulose, unlike its well-known effect in cement-based materials, showed a very limited viscosity enhancing behaviour in aerial lime mortars.An adsorption mechanism of this additive on the Ca(OH) 2 crystals was reported to reduce its entanglement between chains and hence the viscosity of the pastes as well as its water retention ability. The guar gum derivative, which has a larger quantity of ionized groups at alkaline pH, reduced its adsorption onto slaked lime particles and 3 gave rise to a clear increase in viscosity. However, this involved a larger water retention capacity, which in fact resulted in a delay in setting time. The guar gum derivative proved to raise the air content, and changed the pore size distribution of the hardened mortars, thus improving the water absorption through capillarity and durability in the face of freezing-thawing cycles.

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Section: Methodsmentioning

confidence: 99%

Section: Mechanical Strengthsmentioning

confidence: 99%

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Characterization of aerial lime-based mortars modified by the addition of two different water-retaining agents

Izaguirre

Lanas²,

Álvarez

2011

Cement and Concrete Composites

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“…In order to reduce or even solve these problems, the use of admixtures might be considered. In the field of cement mortars, the use of admixtures, substances added in percentages lower than 5% with the purpose of improving certain mortar properties, has been widely researched [13][14][15][16]. In this context, water-retaining agents, water repellents, air-entraining agents (AEA's), water reducers or superplasticizers can be cited.…”

Section: Introductionmentioning

confidence: 99%

Effect of water-repellent admixtures on the behaviour of aerial lime-based mortars

Izaguirre

Lanas²,

Álvarez

2009

Cement and Concrete Research

120

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Two different anionic surfactants, sodium oleate and calcium stearate, commercialized as water repellents for cement-based mortars, were added to lime-based mortars in order to check whether they were improved by these admixtures. Different properties of limebased mortars were evaluated: fresh state behaviour through water retention, air content and setting time, hardened state properties such as density, water absorption through capillarity, water vapour permeability, long-term compressive strengths, pore structure through mercury intrusion porosimetry, and durability assessed by means of freezingthawing cycles. A clear improvement in lime-based mortars was achieved when sodium oleate was added: strong capillarity reduction and excellent durability in the face of freezing-thawing processes, without any compressive strength drop. The mechanism for this improvement was related to air void formation due to the air entraining ability of these surfactants. Insolubility of calcium stearate turned out to be responsible for fewer air bubbles -as SEM examination revealed -and showed lower effectiveness.3

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“…This test was conducted using an HP/HT consistometer according to API (1997) standard test procedures. Moreover, Mishra et al (2003) suggested that the set retardation may be primarily because of the retardation of hydration of 3CaO-SiO 2 through adsorption of the organic slurry on the calcium hydroxide. The time for heating rate was 28 minutes.…”

Section: Experimental Investigationsmentioning

confidence: 99%

Characteristics of Oilwell Cement Slurry Using CMC

Roshan

Asef²

2010

SPE Drilling &Amp; Completion

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The effects of carboxymethylcellulose (CMC) polymer with some other additives on Class G cement were investigated to design a slurry for a field in the south of Iran subject to tectonically induced horizontal in-situ stress. For a number of alternative slurries, characteristics such as compressive strength, permeability, free water, and fluid loss were examined. Fundamental theoretical studies and laboratory experiments were conducted using a system-based approach, endeavoring to minimize undesired properties progressively. The result was a cement slurry with specifications of early and high compressive strength, low permeability, suitable rheological properties, and a wide range of thickening time and suitable slurry for this case. Accordingly, the major contributions of this research lie in two aspects. First, a new package of additives is introduced to be used in similar cases in the oilwell-drilling industry. Second, a systematic experimental/theoretical approach for optimization of cement slurry in accordance with functional requirements is documented.

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Effect of carboxymethyl-cellulose on the properties of cement

Cited by 51 publications

References 9 publications

Characterization of aerial lime-based mortars modified by the addition of two different water-retaining agents

Characterization of aerial lime-based mortars modified by the addition of two different water-retaining agents

Effect of water-repellent admixtures on the behaviour of aerial lime-based mortars

Characteristics of Oilwell Cement Slurry Using CMC

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