Study of rehabilitation mortars: Construction of a knowledge correlation matrix

Marques, Sara; Ribeiro, Ruy A. Sá; Silva, L.; Ferreira, Victor; Labrincha, J.A.

doi:10.1016/j.cemconres.2006.06.005

Cited by 25 publications

(10 citation statements)

References 11 publications

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“…However, those values are still very good for rendering mortars [52,53]. These results may be explained by a highest w/b ratio (as compared to the reference mortar) and an increase of cork dosage (with much lower mechanical resistance) as sand replacement.…”

Section: Mechanical Strength and Porositymentioning

confidence: 85%

Cement-cork mortars for thermal bridges correction. Comparison with cement-EPS mortars performance

Brás

Leal

Faria

2013

Construction and Building Materials

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The aim of this paper is to demonstrate the advantage of cork-mortars for renderings when compared to EPSmortars, from a thermal characteristics point of view, namely in steady and unsteady conditions. It was intended to develop specific rendering mortars able to be applied in thermal bridges to reduce condensation effects and heat transfer in buildings envelopes. The impact of this solution is significant, especially in building typologies as framed reinforced concrete structures. Cement mortars and cement-EPS mortars are used as a reference as their properties are easily recognized compared to cement-cork mortars, which are made with by-products from the cork industry. Several studies were made concerning fresh and hardened state behaviour of mortars, namely: rheological and mechanical properties, microstructure evolution with time and thermal behaviour. For a cement based mortar, different cork dosages (from 0% to 80%) were tested (as sand replacement by mass). Microstructural analyses show that the mechanical properties of cement-cork blends are not only controlled by cork's low density, but also by interaction of cork extractives with the cement hydration process. Thermal conductivity presents a linear decrease for an increasing cork dosage in mortars. Concerning the effect on thermal delay, cork-mortars seem to behave better than EPS-mortars.

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Section: Mechanical Strength and Porositymentioning

confidence: 85%

Cement-cork mortars for thermal bridges correction. Comparison with cement-EPS mortars performance

Brás

Leal

Faria

2013

Construction and Building Materials

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“…There has recently been increased scientific interest in lime-based mortars and their uses, as they show greater compatibility with ancient building materials and fulfil the recommendations of ICCROM [1] about the use of materials similar to the original ones in repair work [2][3][4][5]. Furthermore, they have been widely used in modern work with decorative and protective purposes (renders and facades) [6,7].…”

Section: Introductionmentioning

confidence: 99%

Ageing of lime mortars with admixtures: Durability and strength assessment

Izaguirre

Lanas²,

Álvarez

2010

Cement and Concrete Research

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Lime-based mortars modified with admixtures were prepared and subjected to different environments such as outdoor and indoor exposures, climatic chamber, SO 2 -chamber, and freezing-thawing cycles. The influence that the different admixtures (water repellents, water retainers, polypropylene fibre and a viscosity modifier) had on the pore size distribution of the hardened specimens was assessed and related to the water absorption capacity, and hence to the durability. Ageing resistance and mechanical strengths improved when additives reduced the water intake and increased the aircontent. High dosages of water repellents were necessary to enhance the durability, sodium oleate being the most effective additive to endure freezing processes. Also the low tested dosage of fibre, a water retainer (guar gum derivative), and a starch proved to be useful. SO 2 deposition caused the formation of calcium sulphite hemihydrate as the main degradation product. A very small amount of calcium sulphate dihydrate was observed. A crystal habit composed of acicular agglomerates of calcium sulphite hemihydrate was detected in SO 2 deposition on calcareous materials.3

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“…Also, traces of C 4 AF were present in sample groups RB and CFK. Considering the literature studies [18,24,36,40], it was theorised that different proportions of cement were present in mortar groups BC, C6, RB and CFK. This supposition is in alignment with the average normalised compressive strength of these four mortar groups (f 0 j ranged between 1.56 and 6.65 MPa), which were within the upper bound of the average normalised compressive strengths of all mortar groups considered (refer to Table 7).…”

Section: Powder X-ray Diffraction Analysis Resultsmentioning

confidence: 99%

Assessment of mortar properties in vintage clay brick unreinforced masonry buildings

2015

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Mortar is a principal structural component of unreinforced masonry (URM) buildings, with mortar mechanical properties having an important influence on the behaviour of URM buildings when subjected to earthquake induced shaking. However, the mechanical properties of in situ mortar have long been known to be difficult to obtain. Recommendations on mortar properties for preliminary assessment of URM buildings, as well as details of field assessment procedures for in situ mortar characterisation have been previously suggested in national standards and guidelines in the USA, New Zealand and seismically active countries in Europe. An experimental study was implemented in order to investigate an improved characterisation procedure for vintage mortars, to be used by structural engineering practitioners with the aim to improve the accuracy of building seismic assessments, computer modelling and subsequent seismic retrofit designs. The tested mortar samples were extracted from 60 different vintage URM buildings throughout New Zealand. A nonstandard mortar compression test procedure was developed, and an alternative in situ assessment technique to estimate mortar compressive strength was investigated. Supplementary tests to estimate the mortar aggregate/binder ratio and to predict the presence of cement in the mortar are also discussed.

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Study of rehabilitation mortars: Construction of a knowledge correlation matrix

Cited by 25 publications

References 11 publications

Cement-cork mortars for thermal bridges correction. Comparison with cement-EPS mortars performance

Cement-cork mortars for thermal bridges correction. Comparison with cement-EPS mortars performance

Ageing of lime mortars with admixtures: Durability and strength assessment

Assessment of mortar properties in vintage clay brick unreinforced masonry buildings

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