Influence of Sand-Cement Ratio and Polycarboxylate Superplasticizer on the Basic Properties of Mortar Based on Water Film Thickness

Zhang, Zhao; Feng, Qingge; Zhu, Weiwei; Lin, Xianhao; Chen, Kao; Yin, Wuxiao; Lü, Chunxin

doi:10.3390/ma14174850

Cited by 7 publications

(4 citation statements)

References 40 publications

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“…Comparing the effects of PCE, it can be found that, when the dosage is less than 0.3%, PCE has no significant effect on fluidity. The flow table test results were similar to the experimental conclusions of Zhang et al [33].…”

Section: Consistency Stability and Water Requirementssupporting

confidence: 89%

Both Plasticizing and Air-Entraining Effect on Cement-Based Material Porosity and Durability

Tolegenova

Skripkiūnas

Rishko³

et al. 2022

Materials

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The influence of a complex application of both plasticizing and air-entraining effects on concrete with polycarboxylate ether superplasticizer (PCE), air-entraining admixture (AIR), or an anti-foaming agent (AF) is analyzed in this paper with considerations for on the air content, workability, flexural and compressive strength, and freezing–thawing resistance of hardened cement mixtures. The effect of the complex behavior of PCE, AIR, and AF on the porosity of hardened cement mortar (HCM) and freezing–thawing resistance was investigated; freezing–thawing resistance prediction methodology for plasticized mortar was also evaluated. The results presented in the article demonstrate the beneficial influence of entrained air content on consistency and stability of cement mortar, closed porosity, and durability of concrete. Freezing–thawing factor KF depending on porosity parameters can be used for freezing–thawing resistance prediction. With both plasticizing (decrease in the water–cement ratio) and air-entraining effects (increase in the amount of entrained air content), the frost resistance of concrete increases, scaling decreases exponentially, and it is possible to obtain great frost resistance for cement-based material.

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Section: Consistency Stability and Water Requirementssupporting

confidence: 89%

Both Plasticizing and Air-Entraining Effect on Cement-Based Material Porosity and Durability

Tolegenova

Skripkiūnas

Rishko³

et al. 2022

Materials

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“…After thorough evaluation of the compatibility and interactions of the polymeric chemical additives and lime particles with the PCMs, the mortar formulation was refined. These preliminary studies on the interactions and stability of systems with the simultaneous presence of the superplasticizer and adhesion enhancer, along with a literature review [ 27 , 29 , 31 ], allowed for the simplification of the trial-and-error process in establishing the optimal formulation for PCM-bearing mortars intended for application as renders. In this way, the working ranges for each additive were defined, facilitating the initiation of experimentation and expediting the optimization process for the formulation in a more efficient and straightforward manner.…”

Section: Resultsmentioning

confidence: 99%

“…Previous research [ 25 , 26 , 27 , 28 , 29 ] has demonstrated that a polymer derivative of polycarboxylate ether can effectively serve as a superplasticizer, enhancing the workability of fresh mortar augmenting its fluidity. This obviates the necessity for excessive mixing water and allows for fine-tuning the paste’s fluidity to attain a more easily manageable consistency.…”

Section: Introductionmentioning

confidence: 99%

Study on the Interaction of Polymeric Chemical Additives with Phase Change Materials in Air Lime Renders

Rubio-Aguinaga,

Fernández,

Navarro-Blasco

et al. 2024

Polymers

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The interaction of microencapsulated phase change materials (PCMs) with polymeric chemical additives in an air lime binding matrix was studied. These polymer-based additives included an adhesion booster (derived from starch) and a superplasticizer (polycarboxylate ether). Two different PCMs with melting points of 18 °C and 24 °C were assayed. The microcapsules were composed of melamine, with paraffin-based PCM cores. Measurements of zeta potential, particle size distribution, adsorption isotherms, and viscosity analyses were performed to comprehend the behavior of the polymer-based additives within the air lime matrix and their compatibility with PCMs. Zeta potential experiments pointed to the absence of a strong interaction between the lime particles and the microcapsules of PCMs. At the alkaline pH of the lime mortar, the negative charge resulting from the deprotonation of the melamine shell of the microcapsules was shielded by cations, yielding high positive zeta potential values and stable dispersions of lime with PCMs. The polycarboxylate ether demonstrated the ability to counteract the increase in mixing water demand caused by the PCM addition in the lime matrix. The dispersing action of the superplasticizer on the lime particles was seen to exert a collateral dispersion of the PCMs. Conversely, despite the positive values of zeta potential, the addition of the starch-based additive resulted in the formation of large PCM-lime clumps. Air lime renders incorporating 5, 10, and 20% PCMs by weight with various dosages of these chemical additives were experimented with until the optimal formulation for the specific application of the mortars as renderings was achieved. This fine-tuned formulation effectively tackled issues commonly associated with the addition of PCMs to mortars, such as poor adhesion, crack formation, and reduced fluidity.

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“…When the efficiency of the SP is high and/or the dosage is high (when a polycarboxylate-based SP is employed at high dosage), the problem of diminished cohesiveness becomes more severe [39,40]. To avoid this problem, the SP dose should exceed the amount that causes segregation [41,42].…”

Section: Introductionmentioning

confidence: 99%

The Use of Water Reducing Additives for Development of New Ecological and High-Performance Materials

Mihai,

Mihaela,

Igor

et al. 2023

Ecology & Safety

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The decreasing amount of the world's water supply is a significant issue nowadays. Global warming is one of the key factors contributing to the increasing loss of water supplies, but wasteful water usage for domestic and industrial use is also a major factor. The water consumption reduction by using proper additives is a technique to reduce high water consumption in the construction sector. Sulphonated melamine formaldehyde, sulphonated naphthalene formaldehyde, modified lignosulphonates and polycarboxylate derivatives are examples of additives providing this feature. Condensed polymers are the basis for producing these additives. Their action mechanism consists in the de-flocculation of the cement granules and improving the workability of freshly mixed concrete. The water reduction potency of polycarboxylate derivatives is substantially higher than that of other additives. In the same time, the use of modified lignosulphonates also solves the problem of associated environmental pollution, being a by-product from the wood pulp processing by the sulfite process. Details about water consumption reducing additives will be presented in this paper based on literature review and on the author's own experience: the preparation methods, chemical composition and properties of the obtained building materials.

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Influence of Sand-Cement Ratio and Polycarboxylate Superplasticizer on the Basic Properties of Mortar Based on Water Film Thickness

Cited by 7 publications

References 40 publications

Both Plasticizing and Air-Entraining Effect on Cement-Based Material Porosity and Durability

Both Plasticizing and Air-Entraining Effect on Cement-Based Material Porosity and Durability

Study on the Interaction of Polymeric Chemical Additives with Phase Change Materials in Air Lime Renders

The Use of Water Reducing Additives for Development of New Ecological and High-Performance Materials

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