The effects of DiloCarB as carbonation accelerator on the properties of lime mortars

Ergenç, Duygu; Fort, Rafael; Silva, António Santos; Veiga, Rosário; Araúz, David Sanz

doi:10.1617/s11527-018-1140-0

Cited by 12 publications

(2 citation statements)

References 65 publications

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“…Therefore, lime mortars mixed with pozzolans are compatible materials to historical buildings, owing to their physicochemical, structural, and mechanic characteristics [2]. As opposed to the above, in past decades, the use of cement has prevailed due to high mechanical strength, workability, and accelerated setting time compared with lime mortars [3]. However, the use of such materials has caused damages to monuments, due to incompatibility in porosity, pore size and mechanical properties, high salt content, limited elasticity, etc.…”

Section: Introductionmentioning

confidence: 99%

Nano-TiO2 in Hydraulic Lime–Metakaolin Mortars for Restoration Projects: Physicochemical and Mechanical Assessment

Kapetanaki

Kapridaki

Maravelaki-Kalaitzaki

2019

Buildings

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In recent years, lime mortars mixed with artificial or natural pozzolans are commonly used in restoration applications. The aim of this work is the assessment of carbonation, pozzolanic reaction, setting time, and mechanical properties of metakaolin–lime mortars mixed with crystalline nano-titania (nT) as additive. The studied mortars consist of hydrated lime and metakaolin in 60/40 ratio (wt%) and fine aggregates of either carbonate or silicate sand. The concentration of the nano-titania is equal to 6 (wt%) of the binder. For comparison purposes, three types of mortars and pastes are designed: Without the addition of nano-titania, with nT activated or not under UV irradiation. The evaluation of the carbonation and pozzolanic reaction over a 1.5-year curing period is carried out through thermal analysis (DTA/TG), infrared spectroscopy (FTIR) and X-ray diffraction analysis (XRD). The uniaxial compression and the three-point bending tests at 28 days, 3 months, and 6 months were carried out to evaluate mechanical properties. The addition of activated nano-titania, due to an increased photocatalytic activity, accelerated the setting of the mortars, improving at the same time the mechanical properties. The plastic behavior of the lime–metakaolin mortars with activated nT was attributed to the evolution of carbonation and pozzolanic reaction.

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Section: Introductionmentioning

confidence: 99%

Nano-TiO2 in Hydraulic Lime–Metakaolin Mortars for Restoration Projects: Physicochemical and Mechanical Assessment

Kapetanaki

Kapridaki

Maravelaki-Kalaitzaki

2019

Buildings

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“…Carbonate in turn is known to depend on CO 2 concentration and relative humidity [6], both of which are difficult to control in outdoor environments. Different additives producing rapid carbonation have been studied [7,8] following different strategies such as diethyl carbonation addition.…”

Section: Introductionmentioning

confidence: 99%

New approach to nanolime synthesis at ambient temperature

et al. 2018

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This study explored the viability of synthesising nanolime at ambient temperature by raising calcium solubility through the formation of complexes with dissolved sugars. Micro-Raman findings confirmed the formation of nanolime particles whilst the percentage of Ca(OH) 2 formed, observed to vary with synthesis conditions, was calculated with thermogravimetry. Nanoparticles were synthesised most productively (77%) in a 5% sugary solution at a temperature of 25 °C and a 4 h reaction time. The hexagonal nanoparticles synthesised ranged in size from 200 to 25 nm. Portlandite formation is related to calcium complex formation with less mannitol that sucrose needed to form similar NPs of Ca(OH) 2. The sugary media also favoured the formation of amorphous calcium carbonate.

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