Effect of Thermal Stimulation of Admixture to Workability of the Mortar

Salehi, Mustafa; Tahery, Zabihollah; Sasaki, S.; Date, Shigeyuki

doi:10.7763/ijet.2017.v9.967

Cited by 2 publications

(4 citation statements)

References 5 publications

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“…There result concluded to estimate that polymer relax and straighten by thermal stimulation. Moreover, in previous studies [7]- [10], when the more contained amount of slump keeping polymer, it was recognized that the polymer was relaxing for thermal stimulation. However, it is thought that by cooled slowly it will return to the size and geometric structure of stable polymer molecules in the state before thermal stimulation.…”

Section: Resultsmentioning

confidence: 99%

“…As these results, it was confirmed that the effect of thermal stimulation and its sustainability will be improved as the content of SK type in the superplasticizer increases. In the previous studies [7][8][9][10], only fluidity of the mortar right after mixing were investigated, in this study, the effect of thermal stimulation after mixing had been evaluated. Moreover, it was confirmed that even if the initial dispersion performance improves by thermal stimulation, slump keeping performance can be maintained.…”

Section: Resultsmentioning

confidence: 99%

“…However, it is not generally known that fluidity of concrete can be improved by heating superplasticizers. Moreover, previous study by Zabihollah et al [7] clearly indicated that the fluidity can be improved with applicating of thermal stimulation to superplasticizers on ordinary portland cement. In addition, the paper by Takigawa et al [8], [9] clearly indicated that three-dimensional structure of polymer in the superplasticizers will be changed by thermal stimulation.…”

Section: Introductionmentioning

confidence: 92%

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Effect of Thermal Stimulation on Various Characteristics of Superplasticizer

Takigawa¹,

Bomura²,

Hashimoto³

et al. 2019

IJET

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It is widely known that basic performance of superplasticizer can be fluctuated by change of ambient temperature. However, it is not known that fluidity of concrete can be improved by thermal stimulation to superplasticizer. It was confirmed that fluidity of the mortar has been improved by heating superplasticizer in the previous study, therefore in this study, Examination of thermal stimulation effect on the molecular weight distribution of superplasticizer, the study of retention effect of fluidity after thermal stimulation of superplasticizer, and its sustainability were examined. As a result, it was confirmed that thermal stimulation doesn't negatively affect the molecular weight distribution and affects only the three-dimensional structure of the polymer molecule. Moreover, it was confirmed that the thermal stimulation effect not only sustained the improvement of the initial dispersion performance well but also did not lower the slump keeping performance thereafter. In addition to it was confirmed that the thermal stimulation effect lasted for about 7 days, and the residual characteristics differed depending on the superplasticizer.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 92%

See 1 more Smart Citation

Effect of Thermal Stimulation on Various Characteristics of Superplasticizer

Takigawa¹,

Bomura²,

Hashimoto³

et al. 2019

IJET

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“…Heat stimulation of SP increase the fluidity and air content and slightly decrease the compressive strength. [3][4]. Several factors affect the slump loss of mortar type of cement type and group of superplasticizer and amount of blast furnace slag(BFS).…”

Section: Introductionmentioning

confidence: 99%

Combined Effect of Thermal Stimulated Superplasticizer with BFS on Fresh and Hardened Property of Mortar

Rahmanzai

Nazari

Takigawa

et al. 2018

MSF

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Usage of mineral and chemical admixtures in concrete or mortar is a usual solution to reach full compaction mainly where reinforcement blockage and the shortage of skilled labors happen. Super Plasticizers have become essential ingredients of any designed concrete mix today. Property of fresh and hardened concrete is strongly influenced by the interaction of mineral and chemical admixtures. This paper has been made to evaluate effect of heat stimulation of with two types of Polycarboxylic acid-based ether superplasticizer, pre-cast (SP2) type and ready-mix (SP1) type superplasticizer (SP) with normal Portland cement (OPC), high early strength cement (HESPC) and partially replacement of blast furnace slag (BFS) with cement 0%, 30%, 45%, and 60%. Investigated the fresh and hardened property of mortar. The superplasticizer (SP) was heated in a thermostatic chamber 70°C for 24 hours, the result shows that the heat stimulation of SP increased the fluidity, air content and flow loss, and decrease the density and compressive strength of mortar. Consequently, unitized the flow for heated and non-heated SP, and evaluate them. The air-content, density, and compressive strength were same. Besides, the flow loss was affected by many factors type of cement type of SP and heat stimulation technique of SP amount of BFS. By heat stimulation technique and increasing the amount of BFS caused to decrease the flow loss. The SP1 improve the fluidity and flow loss of mortar than SP2 in all conditions. Heat stimulation technique of SP with HESPC cement doesn’t change the fresh property of mortar. The compressive strength of HESPC was increased than OPC cement. Furthermore, by increasing the amount of BFS increased the fluidity and decreased the compressive strength and effect of heating on fluidity. The water-cement ratio was 30% and sand cement ratio was 2:1. Blast furnace slag (BFS) cause to improve the fluidity of mortar. However, by increasing the amount of BFS the compressive strength and effect of heat stimulation and flow loss was decreased.

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Effect of Thermal Stimulation of Admixture to Workability of the Mortar

Cited by 2 publications

References 5 publications

Effect of Thermal Stimulation on Various Characteristics of Superplasticizer

Effect of Thermal Stimulation on Various Characteristics of Superplasticizer

Combined Effect of Thermal Stimulated Superplasticizer with BFS on Fresh and Hardened Property of Mortar

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