A sustainable production of natural hydraulic lime mortars through bio-amendment

García-González, Julia; Faria, Paulina; Lemos, Paulo C.; Juan-Valdés, Andrés

doi:10.1016/j.conbuildmat.2022.127812

Cited by 10 publications

(4 citation statements)

References 26 publications

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“…Its production requires less energy consumption, making it cheaper. It is also an abundant natural material whose manufacturing process compared to cement turns out to be less complicated and more sustainable [24][25][26]. Currently, lime is used by literally thousands of waste generators in the United States and elsewhere for solidification/stabilization treatment in a broad sense [14,17,22].…”

Section: Introductionmentioning

confidence: 99%

Increasing the Sustainability of the Stabilization/Solidification of Potentially Toxic Elements Contained in Tailings from an Active Mine Using a Modified Lime Mortar

González-Sánchez,

Fernández-Villagómez,

Loredo Jasso

et al. 2024

Sustainability

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The use of a modified lime mortar as a binder for the stabilization/solidification of mine tailings presents a promising and sustainable solution for immobilizing potentially toxic elements found in these waste materials compared to cement mortars. The effectiveness of this modified lime mortar in avoiding the mobility of toxic elements, namely lead (Pb) and arsenic (As), in mine tailings has been thus studied. Encapsulating matrices of 1:1 and 2:1 tailings waste/air lime ratios were prepared. Due to the content of potentially pozzolanic compounds in the mine tailings, mainly some silicate phases, 1:1 matrices showed better mechanical strength than 2:1 samples, ascribed to a more intense pozzolanic reaction. SEM observations identified needle-shaped C-S-H structures. The hardened materials showed good endurance against freeze–thaw cycles. The semi-dynamic tank test demonstrated the effective encapsulation of the toxic components due to the use of lime mortars, yielding values of released Pb and As below the detection limit in all instances. Considering the cost-effectiveness, widespread availability, and ease of use, the use of modified lime mortar for the treatment of mine tailings can be recommended to mitigate the environmental impacts of mining activities.

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Section: Introductionmentioning

confidence: 99%

Increasing the Sustainability of the Stabilization/Solidification of Potentially Toxic Elements Contained in Tailings from an Active Mine Using a Modified Lime Mortar

González-Sánchez,

Fernández-Villagómez,

Loredo Jasso

et al. 2024

Sustainability

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“…Only a few studies have been carried out on the effect of starch as an admixture or additive to concretes and mortars. Starch was used, inter alia, as a viscosity modifier of lime mortar [7] and plasters [8], [9], [10]. In these studies, starch was introduced as an admixture to influence the consistency and viscosity of the mixture.…”

Section: Introductionmentioning

confidence: 99%

Preliminary Studies on a Lightweight Porous Cement-Based Composite – Gel Concrete

Strzałkowski,

Stolarska

2023

J. Phys.: Conf. Ser.

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This paper presents some preliminary results of research on light, highly porous cement composites – gel concretes. A material based on Portland cement was tested, the very high porosity of which (over 60%) was obtained by direct gelatinization of starch in a liquid cement slurry. A composite based solely on cement and concretes produced with the addition of metakaolin or zeolite was tested. The basic properties of the concretes obtained in this way were determined, i.e., the volume density in a dry state, the thermal properties, and the compressive strength. In the case of the thermal properties, tests were performed on specimens dried to constant mass, while the test itself was carried out at an average temperature of 10°C. The tests employed an Isomet 2114 apparatus, which uses a non-stationary heat flow technique. The thermal conductivity coefficients and the volumetric specific heat were determined. The compressive strength tests were carried out on cubic specimens with a side of 4 cm after 28 days of curing by air-drying. Four specimens of each type of composite were tested. For composites based solely on Portland cement, the sorption properties of the material were also tested. For this purpose, the method of dynamic water vapor sorption (DVS) was used. As a result, graphs of the sorption and desorption of individual composites of different densities were obtained. Preliminary qualitative tests were also carried out using an electron microscope. The use of the starch gelatinization process directly in the cement slurry made it possible to obtain a very homogeneous material, in which the initial, temporary structure was starch gel, around which, after exceeding the setting time of the cement, the target cement-based structure was formed – gel concrete. The tested materials are innovative, having excellent thermal properties, comparable mechanical properties to lightweight concretes of the same densities, and is formed using an easily available, relatively cheap admixture in the form of starch. They can be used to produce small masonry elements, such as blocks for external walls or other typical prefabricated lightweight concrete elements.

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“…potential are lime, nanosilica and silica fume. The addition of lime and additives to the mortar mixture can increase the compressive strength by 26%, flexural strength by 25%, and speed up the mortar hydration reaction [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Using Lime, Silica Fume and Nano-Silicaon Mortar Made From Sea Sand and Seawater

Tjahjani¹

2023

GEOMATE

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The need for natural sand (RS) and freshwater (FW) is not proportional to the existing supply, so substitute materials are needed to meet these needs. Seasand (SS) and seawater (SW) are materials that have the potential as substitute materials which have not been utilized so far. The main obstacle to the use of these materials in mortar and concrete is due to the sodium chloride (NaCl) content which can cause corrosion of the reinforcement. This research is an innovation to overcome the NaCl content mixed with materials: Cement (PC), lime stone (LS), silica fume (SF), nano-silica (NS), and superplasticizer (SP) mixed proportions with a volume ratio, cured with SW and FW. The goal is to produce the optimal composition for the use of SS and SW in mortar. For this reason, tests for water content, organic content, compressive strength, porosity, and X-Ray Fluorescence (XRF) and Metrohm 916 Ti Touch Auto Titrator were carried out. The results showed that the optimal mix proportion was 1 PC : 1 SS : 3.75 LS : 1.125 SF : 0.5625 NS : 0.4 SP achieving a compressive strength of 16 MPa (42.4%) from the control mortar (freshwater curing) and 14 MPa (40.4%) (seawater curing). BL is better than MC the NaCl content decreased from 0.32% to 0.25% and increased porosity by 35%. The benefits of this study show that SS and SW can be used as environmentally friendly construction materials.

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A sustainable production of natural hydraulic lime mortars through bio-amendment

Cited by 10 publications

References 26 publications

Increasing the Sustainability of the Stabilization/Solidification of Potentially Toxic Elements Contained in Tailings from an Active Mine Using a Modified Lime Mortar

Increasing the Sustainability of the Stabilization/Solidification of Potentially Toxic Elements Contained in Tailings from an Active Mine Using a Modified Lime Mortar

Preliminary Studies on a Lightweight Porous Cement-Based Composite – Gel Concrete

The Effect of Using Lime, Silica Fume and Nano-Silicaon Mortar Made From Sea Sand and Seawater

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