Effect of side chain length change of polycarboxylate-ether based high range water reducing admixture on properties of self-compacting concrete

Altun, Muhammet Gökhan; Özen, Süleyman; Mardani‐Aghabaglou, Ali

doi:10.1016/j.conbuildmat.2020.118427

Cited by 48 publications

(18 citation statements)

References 30 publications

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“…In the study of Özen et al, 11 it was observed that the adsorption amount increased with the increase of main chain length. On the other hand, the adsorption amount decreased with the increase of side chain length was determined in the paper studied by Altun et al 12 Results of this study show that side chain length effect on the adsorption is more prominent than the effect of main chain length.…”

Section: Resultssupporting

confidence: 46%

“…On the other hand, the amount of adsorption significantly increased with decreasing from 21 to 17 k of the main chain length. The effect of the main chain length and side chain length of PCE‐ether‐based high range WRA on properties of self‐compacting concrete were investigated in the previous studies of the authors 11,12 . Studies gave similar results in terms of adsorption behavior.…”

Section: Resultsmentioning

confidence: 92%

“…The amount of PCE adsorption was determined by using a total organic carbon (TOC) analyzer as similar to studies investigated by Özen et al 11 and Altun et al 12 Marsh‐funnel and mini‐slump tests were carried out following the procedures in Aïtcin 10 and Kantro, 13 respectively. The time‐dependent spread values of the mortar mixtures were determined in accordance with ASTM C1437 at every 15 min for 1 hr.…”

Section: Experimental Studymentioning

confidence: 99%

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Effect of main and side chain length change of polycarboxylate‐ether‐based water‐reducing admixtures on the fresh state and mechanical properties of cementitious systems

Özen

Altun

Mardani‐Aghabaglou

et al. 2020

Structural Concrete

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In this study, the effect of both main and side chain length changes of the admixtures on some properties of cementitious systems were investigated. Three different polycarboxylate‐ether‐based water‐reducing admixtures (WRA) having constant molecular weights and different main and side chain lengths were synthesized. Single type of raw material and carboxylate functional group were used in all WRAs. The molecular weights, free nonionic contents, and anionic/nonionic ratios of the admixtures were kept constant. Test results showed that degree of fluidity was observed in cement paste and mortar mixtures in case the admixture main and side chain length is more or less than a critical value. This negative effect is thought to be due to the weakening of the adsorption ability by the chain length change of the admixtures, the being tendency of polymers to intertwine and the adsorbing of admixture on several cement particles simultaneous. Admixtures having excessive long or short main chain and side chain improved the time‐dependent slump‐flow retention of the mortar mixtures. The admixtures with short main and side chains had insufficient adsorption ability and the admixture with excessive long main and side chains had the interlacing risk of polymers. In both cases, time‐dependent behavior improved because the amount of free admixture in solution increased. The change in the chain lengths of the WRAs affected the 1‐day compressive strength of the mortar mixtures.

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Section: Resultssupporting

confidence: 46%

Section: Resultsmentioning

confidence: 92%

Section: Experimental Studymentioning

confidence: 99%

See 1 more Smart Citation

Effect of main and side chain length change of polycarboxylate‐ether‐based water‐reducing admixtures on the fresh state and mechanical properties of cementitious systems

Özen

Altun

Mardani‐Aghabaglou

et al. 2020

Structural Concrete

Self Cite

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“…This situation was caused by the electrostatic effect and the steric hindrance mechanism of the HRWRA. It was reported by Altun et al (2020) that the structure of HRWRA consists of carboxylate functional groups and polyethylene side chains. The electrostatic effect occurs when the carboxylate groups of the HRWRA adhere to the cement surface.…”

Section: Resultsmentioning

confidence: 99%

Investigation of High Range Water-Reducing Admixture Requirement in Cementitious Systems Containing Fly Ash with Different Utilization Ratio and Fineness

SAHIN¹,

BIRICIK²,

Mardani‐Aghabaglou³

2022

EPSTEM

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“…Altun et al investigated the effect of side chain length, molecular weight hangers and adsorption amounts of polycarboxylate ether based high range admixtures with fixed main chain length, free nonionic amount and anionic / nonionic ratio on fresh and hardened concrete properties. The increase in the side chain length of the additives had a positive effect on the time-dependent fresh state performance of the concrete mixtures [38].…”

Section: Introductionmentioning

confidence: 96%

Effects of accelerator type and dosage on the mechanical and durability properties of rapid-setting precast concrete

ÇÖĞÜRCÜ¹

2022

Sigma J Eng Nat Sci - Sigma Müh Fen Bil Derg

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Precast concrete construction is frequently preferred all over the world because of its rapid production and low cost. Prefabricated structures are constructed by assembling, the structural elements that were produced in the factory, at the construction site. However, some connection types such as wet connection used in prefabricated buildings eliminate the rapid installation feature. The wet c onnections are t he method of assembling w ith f resh c oncrete. In t he wet connections, the setting time of concrete decreases the installation rapid of prefabricated structures. In the past years, various additives have been used to accelerate the setting time. However, these additives consisting of organic salts cause corrosion in the reinforcement. In recent years, the use of inorganic salts with low ions activity as the accelerator has become widespread. Rapid-setting concrete is suitable for producing precast concrete. This paper deals with the determination of optimal accelerator type and dosage for precast concrete. Sodium aluminate and Polycarboxylic ether-based chemicals were utilized as the accelerator to obtain rapid-setting concrete mixtures. Mechanical and durability tests were performed to analyze each chemical effect on the fresh and hardened properties of the concrete mixes. Polycarboxylic ether-based chemical is observed as a potential accelerator for precast concrete, especially for the connection concrete parts. With polycarboxylic ether-based chemicals, it is observed that rapid strength gain is achieved without much loss of final strength. Besides, polycarboxylic ether-based chemicals increase the workability of mixtures. However, it is observed that the workability feature is lost in a short time due to the rapid-setting feature.

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Effect of side chain length change of polycarboxylate-ether based high range water reducing admixture on properties of self-compacting concrete

Cited by 48 publications

References 30 publications

Effect of main and side chain length change of polycarboxylate‐ether‐based water‐reducing admixtures on the fresh state and mechanical properties of cementitious systems

Effect of main and side chain length change of polycarboxylate‐ether‐based water‐reducing admixtures on the fresh state and mechanical properties of cementitious systems

Investigation of High Range Water-Reducing Admixture Requirement in Cementitious Systems Containing Fly Ash with Different Utilization Ratio and Fineness

Effects of accelerator type and dosage on the mechanical and durability properties of rapid-setting precast concrete

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