Determination of time zero in high strength concrete containing superabsorbent polymer and nano-silica

Cunha, Thyala A.; Francinete, Paulo; Manzano, Manuel A.; Aidar, Luiz Augusto Gimenez; Borges, Juliana Gonçalves; Silva, E. F.

doi:10.1007/s41024-016-0020-7

Cited by 7 publications

(5 citation statements)

References 15 publications

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“…These results agree with Cunha et al [77], where fresh-state densities for 0.2 − 0.3% of SAP (poly(acrylic acid)-polyacrylamide) with a w/c ratio = 0.40 was 2.24 g•cm − 3 , and with Esteves et al [78], where the corresponding value for mortars that contain SAP (acrylamide/acrylic acid copolymer) with 0.2% w/wt. cement ratio was ~ 2.25 g•cm − 3 .…”

Section: Density In Fresh Statesupporting

confidence: 92%

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Performance of cementitious mortars containing hydrogel–nanoclay hybrid nanocomposite

Filho,

de Moura,

Aouada

2024

J Sol-Gel Sci Technol

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Cement-based composites comprise a binder matrix with or without aggregates. Hydration of cement is an exothermic reaction that releases considerable quantities of heat, causes drying shrinkage, and results in cracks that can compromise the performance of the structure. Hydrogels can help mitigate such cracking as their hydrophilic characteristics and 3D crosslinked structure enable them to absorb and directly release water into the cement matrix over time. The aim of this study is to synthesize and analyze the effect of adding hybrid nanocomposite hydrogels with different concentrations (0, 10, and 20% w/v) of Cloisite-Na + nanoclay in their fresh and hardened cement mortar states. The hydrogels were synthesized via free radical polymerization, and four cementitious mortar samples (M, M0, M10, and M20), were prepared with 1:2.16, 0.40 water/cement and 0.50% presoaked hydrogel (wt./wt cement ) ratios.The results demonstrated that the density of all the mortars in the fresh state was ~ 2.16 ± 0.01 g.cm − 3 , but a decreasing trend was observed that could attributed to the increase of air incorporation into the mortar. At 28 days, the results indicated that the hydrogel with 20% Cloisite-Na + was the most e cient, causing a reduction of ~ 4.41% in water absorption by the mortar. For all the three curing conditions considered, all mortars demonstrated considerable shrinkage over time. However, the controlled curing indicated that M20 mortars demonstrated 30.5% less shrinkage compared to the control sample. Thus, the results indicate that the mortars containing hydrogel demonstrate satisfactory behavior in both the fresh and hardened state, highlighting its e ciency as a curing agent.

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Section: Density In Fresh Statesupporting

confidence: 92%

“…Cunha et al [77] obtained a comparable result that they attributed to the augmented air content caused by the presence of entrapped air bubbles formed in the matrix when the curing water was released. This was considered to affect the mechanical properties.…”

Section: Air Contentmentioning

confidence: 78%

Performance of cementitious mortars containing hydrogel–nanoclay hybrid nanocomposite

Filho,

de Moura,

Aouada

2024

J Sol-Gel Sci Technol

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“…Furthermore, a study of the evolution law and the effect of time-varying damage by different internal curing agents on the macro and micro properties of concrete was discussed. The evolution law and prediction model of the concrete with SAP were also studied by [15][16][17]. The effect of SAP on the transition zone of the steel fiber interface in concrete and related properties was discussed by [9,10].…”

Section: Introductionmentioning

confidence: 99%

“…It has been ascertained from the above research results that the effect of SAP on concrete strength was controversial [13,18], and the frost resistance and durability of concrete can be effectively improved by SAP [19][20][21]. The autogenous shrinkage and dry shrinkage of concrete were reduced, and the tensile creep of the concrete could also be improved by 50% [15,16,22]. In addition, scanning electron microscopy (SEM), nuclear magnetic resonance (NMR), mercury intrusion porosimetry (MIP), and thermogravimetric analyzer (TGA) methods were adopted to discern the effect of SAP on the microstructure of concrete [14,23,24].…”

Section: Introductionmentioning

confidence: 99%

Effect of Superabsorbent Polymer on the Mechanical Performance and Microstructure of Concrete

2021

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The internally cured material known as superabsorbent polymer (SAP) is an important innovation in concrete engineering technology. This paper investigates the effect of adding a polymer with superabsorbent capabilities on the physical and mechanical performance of concrete. The microstructure of the new hybrid concrete was also studied, and the influence of the polymer particle size and volume on the mechanical durability was evaluated. The mechanical properties of the new hybrid concrete, such as compressive strength, flexural strength, elastic modulus, and splitting tensile strength, were measured through laboratory experiments. The microstructure characteristics of the concrete were also investigated by scanning electron microscopy (SEM). The results show that shrinkage was reduced, while the volume stability of the concrete improved. Moreover, we found that cracking was reduced, while issues such as chloride penetration and freeze-thaw resistance were also improved. In addition, the SAP could effectively improve the microstructure of the concrete and refine the pore structure, as seen in the microscopic test. This paper helps to promote the development of internally cured material and improve technology for the prevention of concrete construction cracks.

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“…[19] Thus, the internal curing (IC) is a very promising technique that can provide additional moisture to the concrete, aiming more effective cement hydration with low self-drying. [24,25] It is established that the final properties of a cementitious matrix depend directly on the perfection and the time in which its healing process was performed. [26] In this way, the use of polymers and hydrogels as IC agents into inorganic matrices is an alternative to avoid the shrinkage of these cement-hybrid matrices without modifying or even improve their mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Effect of Hydrogel Nanocomposites on the Fresh and Hardened Properties of Cementitious Pastes

Siqueri

Filho

Moura

et al. 2020

Macromolecular Symposia

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Cement is a material widely used in civil construction due to its physical and chemical properties, ensuring a good performance. Some polymeric materials, such as hydrogels, have been frequently added to improve these properties and mitigate autogenous retraction in cementitious matrices. This paper aimed to evaluate the influence of polymeric hydrogel on the fresh and hardened properties of cementitious pastes (water/binder ratio = 0.35). Fresh properties results showed that the consistency and exudation indexes of these matrices decreased with an increase in the amount of hydrogel. The values of the bulk density of all cementitious matrices are around 2.1–2.2 g cm−3. Matrices containing up to 1.0% of hydrogel have satisfactory mechanical properties, reaching compressive strength of 60 MPa for 112 days of curing age. From these results, it is possible to conclude that hydrogels are promising materials for civil engineering applications, acting mainly as a filler and hydroretentor agent.

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Determination of time zero in high strength concrete containing superabsorbent polymer and nano-silica

Cited by 7 publications

References 15 publications

Performance of cementitious mortars containing hydrogel–nanoclay hybrid nanocomposite

Performance of cementitious mortars containing hydrogel–nanoclay hybrid nanocomposite

Effect of Superabsorbent Polymer on the Mechanical Performance and Microstructure of Concrete

Effect of Hydrogel Nanocomposites on the Fresh and Hardened Properties of Cementitious Pastes

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