Effect of non-adsorbed superplasticizer molecules on fluidity of cement paste at low water-powder ratio

Matsuzawa, Kazuki; Shimazaki, Daiki; Kawakami, H.; Sakai, Etsuo

doi:10.1016/j.cemconcomp.2018.12.025

Cited by 38 publications

(12 citation statements)

References 21 publications

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“…In cementitious systems, the PCE adsorbed to the cement particle affects the initial flow. However, the time‐dependent flow behavior is influenced by the quantity of PCE that remains unabsorbed by cement particles and remains in solution 30,50,51,61–64 . Within the scope of this study, the results of the TOC analysis revealed that the control cement, without GA, had the highest PCE adsorption (Figure 2).…”

Section: Resultsmentioning

confidence: 83%

“…However, the time-dependent flow behavior is influenced by the quantity of PCE that remains unabsorbed by cement particles and remains in solution. 30,50,51,[61][62][63][64] Within the scope of this study, the results of the TOC analysis revealed that the control cement, without GA, had the highest PCE adsorption (Figure 2). When an excess amount of PCE is initially adsorbed, it is expected that slump loss will be more pronounced in terms of time-dependent behavior.…”

Section: Slump-flow Performance Of Mortar Mixturesmentioning

confidence: 77%

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Evaluation of fresh state, rheological properties, and compressive strength performance of cementitious system with grinding aids

Kaya,

Kobya,

Mardani

2024

J of Applied Polymer Sci

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Grinding aids (GA) affect the fresh and hardened state properties of cement systems in addition to the economic and ecological advantages they provide. Nevertheless, there is not enough information in the literature regarding the effect of GA utilization on the rheological properties of cementitious systems. In this study, the effect of different types of GA utilization on the grinding efficiency, setting time, and physical properties of cement and rheological properties of cement paste was investigated. Besides, adsorption of the water‐reducing admixture (polycarboxylate ether [PCE]) to the cement containing GA was investigated by total organic carbon analysis. According to the results, regardless of the type of GA, while the grinding efficiency was positively affected by GA utilization in cement, the adsorption degree of PCE, some fresh and rheological properties of the mixtures were negatively affected. With the use of GA, an increase was observed in the early age compressive strength of mortar mixtures. Consequently, the properties of cementitious systems containing GA should be taken into consideration to assess GA performance in addition to the grinding efficiency.

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Section: Resultsmentioning

confidence: 83%

Section: Slump-flow Performance Of Mortar Mixturesmentioning

confidence: 77%

Evaluation of fresh state, rheological properties, and compressive strength performance of cementitious system with grinding aids

Kaya,

Kobya,

Mardani

2024

J of Applied Polymer Sci

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“…Thus, WRAs lead to agglomeration by forming a bond bridge between the particles and preventing the cement particles from moving away from each other as shown in Figure 4. This adversely affects the flow performance of cementitious systems 20 …”

Section: Resultsmentioning

confidence: 99%

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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“…Regarding adsorption-residual amount: Zhang et al, 11 Hot et al, 10 Dalas et al 17 believed that faster adsorption rates and reduced residual amounts in cement pore solutions lead to decreased cement and concrete viscosities. However, Plank et al, 18,19 Matsuzawa et al 20 proposed that remaining PCE molecules or small molecules in cement pore solutions provide a "ball effect" for achieving reduced viscosities.…”

Section: Introductionmentioning

confidence: 99%

Effect of the structure of macromonomer in polycarboxylate superplasticizer on viscosity and workability of concrete

Pang,

Guo,

et al. 2024

Polymers for Advanced Techs

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Reducing the water‐to‐cement (w/c) ratio was the most direct way to decrease the dosage of cement while ensuring compressive strength of concrete. However, the concrete system tend to be more stickiness at low w/c ratio. Four types of polycarboxylate superplasticizers (PCEs) were synthesized using HPEG, IPEG, EPEG, or VPEG as macromonomers. The impact of PCEs on the viscosity and workability of cement and concrete was investigated. The mechanism behind the macroscopic properties exhibited by these four PCEs was explored through surface tension analysis, GPC analysis, NMR analysis, and adsorption capacity evaluation. The results indicated that, at high w/c ratio (≥0.35), concrete mixed with four types of PCEs demonstrated almost the same flow velocity and viscosity, at low w/c ratio (≤0.3), the V‐funnel time of concrete which mixed with 67EPC3.5 reached 8.5 s, showed the fastest flow velocity and lowest viscosity, due to the structure of 67EPC3.5 containing the highest content of combined units of AAA which resulted in rapid adsorption rate and maximum adsorption quantity, and the viscosity effect was independent of surface tension. Concrete mixed with 67IPC3.5 displayed the superior workability at any w/c ratio primarily because the structure of 67IPC3.5 contained the highest content of polyoxyethylene ether which effectively reduced surface tension.

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Effect of non-adsorbed superplasticizer molecules on fluidity of cement paste at low water-powder ratio

Cited by 38 publications

References 21 publications

Evaluation of fresh state, rheological properties, and compressive strength performance of cementitious system with grinding aids

Evaluation of fresh state, rheological properties, and compressive strength performance of cementitious system with grinding aids

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 the structure of macromonomer in polycarboxylate superplasticizer on viscosity and workability of concrete

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