Combined effect of superplasticizer, silica fume and temperature in the performance of natural hydraulic lime grouts

Baltazar, Luís G.; Henriques, Fernando; Jorne, Fernando; Cidade, M. T.

doi:10.1016/j.conbuildmat.2013.10.005

Cited by 92 publications

(46 citation statements)

References 37 publications

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“…The widespread use of hydrated lime and pozzolan-hydrated lime pastes for paints, consolidant products, soil treatments and the obtaining of repair mortars and grouts, especially for architectural monuments of the Cultural Heritage, supports the interest of these materials. In the case of grouts, one of the most relevant features is to achieve a suitable flowability that allows the grout to fill voids providing a good continuity of the masonry system [19]. In order to design suitable hydrated lime pastes and mortars, the use of compatible and effective SPs seems to be imperative.…”

Section: Introductionmentioning

confidence: 99%

Assessment of the interaction of polycarboxylate superplasticizers in hydrated lime pastes modified with nanosilica or metakaolin as pozzolanic reactives

Navarro-Blasco

Perez-Nicolas

Fernández

et al. 2014

Construction and Building Materials

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Two polycarboxylate ether copolymers were assessed as superplasticizers (SPs) for hydrated lime pastes modified with two reactive compounds, nanosilica (NS) and ceramic metakaolin (MK). Characterization of the molecular structure of the SPs by Size Exclusion Chromatography, XRD, FTIR and MALDI-TOF (Matrix Assisted LaserDesorption Ionization Time-of-Flight) mass spectrometry was performed. The structures of the polymers were seen to be star-and worm-like shapes. A close relationship was found between the molecular architecture and the flowability of the pastes, being the star-shaped plasticizer the most efficient. Zeta potential assessment allowed us to elucidate a steric hindrance as the main action mechanism for these polymers. The large specific surface area of nanosilica led to a large SPs consumption as compared with metakaolin with lower surface area. However, SPs in MK-lime samples were attached favourably on the C-S-H and aluminate hydrates, so that the dispersing action was greater with respect to NS-lime suspensions.2

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Section: Introductionmentioning

confidence: 99%

Assessment of the interaction of polycarboxylate superplasticizers in hydrated lime pastes modified with nanosilica or metakaolin as pozzolanic reactives

Navarro-Blasco

Perez-Nicolas

Fernández

et al. 2014

Construction and Building Materials

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“…This reduction is explained by the decrease of the grout wettability and the grout filtration rate (see Section 4.1.4). The grout filtration rate is also minimized through the use of SP, which enables the development of repulsive forces on the surface of the suspension grains, resulting in a lower flocculation/coagulation rate [36,37].…”

Section: Tablementioning

confidence: 99%

Evaluation of the grout injectability and types of resistance to grout flow

Jorne

Henriques

2016

Construction and Building Materials

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“…For example, some lime-based grouts are used to consolidate masonry by injection. For such applications, the mechanical strength of the grout can be enhanced by the addition of silica fume, coal fly ash and superplasticizer [6][7][8][9] but the compressive strength remains low (5-10 MPa) [10]. In contrast, it is possible to obtain cement-based grout, used for concrete repair, that reaches a compressive strength ranging between 95 and 110 MPa [11].…”

Section: Introductionmentioning

confidence: 97%