The AC response of polymer-coated mortar specimens

Shi, Zhong; Mei-lun, Shi; Chen, Zhiyuan

doi:10.1016/s0008-8846(02)00741-x

Cited by 26 publications

(10 citation statements)

References 3 publications

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“…Even if the C 4 AH 13 peaks of the paste at the / of 5% and the control paste appear simultaneously, the peak intensity of the modified paste is weaker than that in the control. This shows that the speed of reaction in (2) is slower little by little until the generation of C 4 AH 13 is slower than the consumption of it in the reaction in (3) at larger / , at which time the AFt content is controlled by the reaction in (2) (3) in the control. It can be concluded that SAE dispersion changed the controlling factor of AFt generation.…”

Section: Hydrates Of Calciummentioning

confidence: 91%

“…It is well known that polymers can improve the toughness, bond strength, impermeability, frost resistance, and many physical properties of the cement-based materials [1][2][3][4][5]. That is why polymer-modified cement mortar is being more and more widely used in many applications such as tile adhesives, frontage coatings, coverings, and repair mortar.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Styrene-Acrylic Ester Dispersion on the Early Hydration of Cement

Wang

Shi

2014

Advances in Materials Science and Engineering

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Early hydration of cement in the presence of styrene-acrylic ester (SAE) dispersion was investigated, and the hydration heat, hydration degree, and hydrates were analyzed using isothermal calorimeter, XRD, and ESEM. The results show that SAE dispersion prolongs the induction period, postpones and shortens the accelerating period, and inhibits the decelerating and stable periods of cement hydration. The hydration heat and hydration degree of cement in the presence of SAE dispersion are less than those of the control. SAE dispersion inhibits the formation of C4AH13and thus AFt, and more SAE dispersion brings stronger influence, but it enhances the stability of AFt. AFt generation during the early hydration period is controlled gradually by the reaction of C4AH13generation with increasing SAE dispersion, but this is controlled by the reaction of C4AH13consumption for the control paste. Besides, SAE dispersion retards and inhibits the formation of CH and C-S-H and also changes their morphology.

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Section: Hydrates Of Calciummentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Influence of Styrene-Acrylic Ester Dispersion on the Early Hydration of Cement

Wang

Shi

2014

Advances in Materials Science and Engineering

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“…The indirect contact method requires a medium between the electrodes and the sample. The media can include electric material, such as cement paste [13], tissue paper wetted with a NaOH solution [14] or conductive glue [15], and non-conductive material, such as an air gap [16,17] or insulation material [11,18]. Mason et al [19] investigated ACIS measurements of cement paste using different electrode materials and contact methods and found that a low frequency arc is associated with the contact methods used between the electrodes and sample.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Sample-Electrode Contact Impedance in Two-Point Measured AC Impedance Spectroscopy of Cement-Based Materials

He¹

2018

IJMSA

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In this study, AC impedance spectroscopy measurements of cement paste with 0.5 W/C were collected and interpreted using different electrode-sample contact methods. The results indicated that when using a conductive glue contact (CG), two capacitive loops and an inclined line appeared within the frequency range of 100-0.1 Hz. An equivalent circuit, R s (C d1 (R ct Z w)) (R d2 C d2), was proposed for contact impedance of the electrode-sample interface, and correction of error caused by the contact impedance of electrode-sample indicated that the contact impedance had almost no effect on the ACIS measurements of the cement paste with CG contact in the present curing conditions. When the samples were cured in a fog room, the CG and electrode pre-casting (EP) contact had similar interpreted parameters (P cp). However, the demolded sample-electrode (DS) contact method and the drying environment used in the manufacture of the EP contact can significantly change P cp. In this situation, both of CG and EP contact are reasonable for ACIS measurements of cement-based materials. EP contact cannot be used for samples cured in a drying environment, and DS contact cannot be recommended for ACIS measurements of cement-based materials.

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“…La modification des matériaux traditionnels par des polymères devrait augmenter la résistance à la traction ou à la flexion et la ténacité des matériaux, sans induire une diminution importante de la résistance à la compression. En outre, le matériau ciment modifié par polymère présente une bonne liaison et une meilleure adhérence aux agrégats ou ouvrages détériorés déjà existants, il est donc utile pour la réparation des constructions [4,5] et améliore imperméabilité qui conduit à une plus faible diffusivité des chlorures [6][7][8], une meilleure résistance au gel [9], une réduction du taux de retrait [10], et finalement améliore la durabilité [11][12][13][14].…”

Section: Introductionunclassified

Physico-mechanical characterization of composite cementitious mortars modified by resin containing antifoam

et al. 2018

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Nowadays, polymer-modified mortars (PMM) are generally used in the field of building as finishing materials. In general, The properties of the fresh and hardened PMC are affected by several factors that tend to interact each other: the nature of materials used as latex, cement and aggregates; the mix proportions (W/C, polymer/cement ratio, etc.); air content; type and amount of surfactants and anti-foaming; and curing methods. This present experimental work aims to study the influence of the rate of partial substitution of cement by resin containing anti-foaming on the properties of composite mortars in the fresh and hardened state particularly workability, tensile and compressive strengths at different times (3, 7 and 28 days) and module of static elasticity at 28 days. For that purpose, seven mortar combinations were developed from the various substitution percentages (0 to 15% by step of 2.5%). The treatment of the obtained results reveals that this partial replacement of the cement by resin improves, clearly, the workability of mortars and decreases the report W/C at the same time. Besides, the incorporation of resin affects significantly the mechanical strengths, and consequently, the addition by substitution of the polymer-latex improves, slightly, the mechanical behavior in tensile where the rates of increase range from 2.20% to 8.54% for replacement percentages of 2.5% and 15%, respectively. Furthermore, the compressive strengths of cement-resin composite mortars are lower compared to the reference mortar made with the cement Portland (CEM I). The notable decrease in compressive strength of polymer-modified mortars can be justified by the reduction of cementitious part, in hybrid materials, which is an indispensable and responsible part of improving compressive strength.

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The AC response of polymer-coated mortar specimens

Cited by 26 publications

References 3 publications

Influence of Styrene-Acrylic Ester Dispersion on the Early Hydration of Cement

Influence of Styrene-Acrylic Ester Dispersion on the Early Hydration of Cement

Evaluation of Sample-Electrode Contact Impedance in Two-Point Measured AC Impedance Spectroscopy of Cement-Based Materials

Physico-mechanical characterization of composite cementitious mortars modified by resin containing antifoam

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