Thermal conductivity of lime mortars and calcined diatoms. Parameters influencing their performance and comparison with the traditional lime and mortars containing crushed marble used as renders

Barbero–Barrera, María del Mar; García-Santos, Alfonso; Neila-González, Francisco Javier

doi:10.1016/j.enbuild.2014.02.065

Cited by 31 publications

(11 citation statements)

References 59 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Unlike numerous studies on the testing of thermal parameters of cement composites, investigation of heat transport and storage parameters of lime-based mortars was rarely studied up to now. Barbero-Barrera et al [90] analyzed thermal conductivity of traditional lime mortar, lime mortars with calcined diatoms, and lime mortars with crushed marble. The thermal conductivity of reference lime mortar and lime mortars with marble aggregate ranged varied from 0.104 to 0.123 W/(m∙K).…”

Section: Resultsmentioning

confidence: 99%

Influence of Wood-Based Biomass Ash Admixing on the Structural, Mechanical, Hygric, and Thermal Properties of Air Lime Mortars

et al. 2019

View full text Add to dashboard Cite

Mechanically-activated wood-based biomass ash (WBA) was studied as a potential active admixture for design of a novel lime-pozzolan-based mortar for renovation purposes. The replacement ratio of lime hydrate in a mortar mix composition was 5%, 10%, and 15% by mass. The water/binder ratio and the sand/binder ratio were kept constant for all examined mortar mixes. Both binder constituents were characterized by their powder density, specific density, BET (Brunauer–Emmett–Teller), and Blaine specific surfaces. Their chemical composition was measured by X-ray fluorescence analysis (XRF) and mineralogical analysis was performed using X-ray diffraction (XRD). Morphology of WBA was investigated by scanning electron microscopy (SEM) and element mapping was performed using an energy dispersive spectroscopy (EDS) analyzer. The pozzolanic activity of WBA was tested by the Chapelle test and assessment of the Portlandite content used simultaneous thermal analysis (STA). For the hardened mortar samples, a complete set of structural, mechanical, hygric, and thermal parameters was experimentally determined. The mortars with WBA admixing yielded similar or better functional properties than those obtained for traditional pure lime-based plaster, pointing to their presumed application as rendering and walling renovation mortars. As the Chapelle test, STA, and mechanical test proved high pozzolanity of WBA, it was classified as an alternative eco-efficient low-cost pozzolan for use in lime blend-based building materials. The savings in CO2 emissions and energy by the use of WBA as a partial lime hydrate substitute in mortar composition were also highly appreciated with respect to the sustainability of the construction industry.

show abstract

Section: Resultsmentioning

confidence: 99%

Influence of Wood-Based Biomass Ash Admixing on the Structural, Mechanical, Hygric, and Thermal Properties of Air Lime Mortars

et al. 2019

View full text Add to dashboard Cite

show abstract

“…In the three equations obtained for thermal conductivity the conclusions were coherent: aerial lime, fly ash, and air entrainers influence positive thermal conductivity. According to various authors [ 10 , 25 ], fly ash and lime can be used as a partial replacement of cement in order to reduce the thermal conductivity of mortars. The incorporation of these materials allows obtaining lighter renders, with higher porosity, thus decreasing the thermal conductivity coefficient [ 19 , 25 , 26 ].…”

Section: Results Discussionmentioning

confidence: 99%

“…In addition to these characteristics, a mixed cement plus lime binder can increase the render’s porosity, leading to lightweight renders [ 24 ]. Lime allows lowering the thermal conductivity, while cement improves the mechanical properties [ 24 , 25 ].…”

Section: Literature Reviewmentioning

confidence: 99%

Parametric Analysis to Study the Influence of Aerogel-Based Renders’ Components on Thermal and Mechanical Performance

et al. 2016

View full text Add to dashboard Cite

Statistical models using multiple linear regression are some of the most widely used methods to study the influence of independent variables in a given phenomenon. This study’s objective is to understand the influence of the various components of aerogel-based renders on their thermal and mechanical performance, namely cement (three types), fly ash, aerial lime, silica sand, expanded clay, type of aerogel, expanded cork granules, expanded perlite, air entrainers, resins (two types), and rheological agent. The statistical analysis was performed using SPSS (Statistical Package for Social Sciences), based on 85 mortar mixes produced in the laboratory and on their values of thermal conductivity and compressive strength obtained using tests in small-scale samples. The results showed that aerial lime assumes the main role in improving the thermal conductivity of the mortars. Aerogel type, fly ash, expanded perlite and air entrainers are also relevant components for a good thermal conductivity. Expanded clay can improve the mechanical behavior and aerogel has the opposite effect.

show abstract

“…This test is widely accepted for measuring the surface electrical resistivity of concrete as well as lime mortar. The instrument setup consists of four equally spaced electrodes that can be placed on cylindrical samples and works on the principle of Ohm's law, as shown in Equation (6); the outer two electrodes transmit currents and the inner two electrodes measure the potential difference between them [54,55]. The resistance is calculated using Equation (6) with the resistivity measured by the given Equation (7).…”

Section: Electrical Conductivity Testingmentioning

confidence: 99%

“…The thermal conductivity of a mortar mix is dependent on several factors, namely porosity, density, moisture content, volume of material, type and degree of saturation, nature and amount of aggregates, etc. [34,54,55,[57][58][59]. The void ratio, or packing density, greatly affects the thermal conductivity of limes [54,58]; an increase in porosity, and thus air voids, implies a reduction in weight, density, and thermal performance when compared to a material with less air content having the same volume.…”

Section: Thermal Conductivitymentioning

confidence: 99%

Response of Organic Lime Mortars to Thermal and Electrical Shocks Due to Lightning Strikes

et al. 2020

View full text Add to dashboard Cite

Lightning strikes are prevalent and inevitable natural phenomena that might cause damages during interaction with building structures and, in some cases, culminate in fires. During the last decades, several lightning strikes have caused considerable damages to cultural and heritage buildings. Furthermore, recent studies indicated a plausible connection between climate changes due to global warming and variations in the frequency and intensity of lightning. The evaluation of the structural efficiency and resilience of cultural buildings to global changes and natural risks appears significant in the light of the current scientific debate. This research aims at the assessment of lightning strikes’ effects on ancient heritage binding materials through the characterization of their thermal and electrical conductivity properties. This study focused on the performance evaluation of green and low-cost mortars based on the use of organic additives. Lime samples were reverse engineered by using a mixture of organics (fig, jaggery, black grape, banana, kadukai), which comprises the most common additives used in traditional Indian mortars. The reliability of the organic mixture in enhancing the resilience of masonry to lightning strikes was analyzed by using electromagnetic field simulation.

show abstract

Thermal conductivity of lime mortars and calcined diatoms. Parameters influencing their performance and comparison with the traditional lime and mortars containing crushed marble used as renders

Cited by 31 publications

References 59 publications

Influence of Wood-Based Biomass Ash Admixing on the Structural, Mechanical, Hygric, and Thermal Properties of Air Lime Mortars

Influence of Wood-Based Biomass Ash Admixing on the Structural, Mechanical, Hygric, and Thermal Properties of Air Lime Mortars

Parametric Analysis to Study the Influence of Aerogel-Based Renders’ Components on Thermal and Mechanical Performance

Response of Organic Lime Mortars to Thermal and Electrical Shocks Due to Lightning Strikes

Contact Info

Product

Resources

About