Papers by Keyword: Lime

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Authors: Marouen Slaimia, Naima Belayachi, Dashnor Hoxha
Abstract: The purpose of this study is to evaluate the potential of bio-sourced material based on cereal straw for an efficient insulation. Decreasing significantly energy consumption of buildings requires not only the very best insulation material for heat loss reduction through the wall but also the reduction of air permeability which can affect automatically the comfort in the building. This is why, propose an insulation material with low thermal conductivity remains insufficient and the evaluation of the performance of the new insulation material in situ in real conditions is an essential step. The experimental building ( PROMETHE demonstrator) is set up with wood frame and multilayered walls composed with cinder blocks and insulation bio-composite based on cereal straw in order to simulate the thermal rehabilitation conditions according the External thermal insulation principle. Each façade is divided in four part with three different insulation bio-composites and naked part for comparison reasons. Hygrothermal sensors are used both inside and outside of the demonstrator, and heat-flux sensor is placed at the cinder blocks biocomposite interface. These in situ measurements are used to compare the efficiency of three bi-sourced materials and for the modeling the hygrothermal behavior of the multilayer wall by using the set of identified parameters in laboratory.
460
Authors: Afonso Rangel Garcez de Azevedo, Jonas Alexandre, Gustavo de Castro Xavier, Fernando Cesar Coelho França, Flavio de Andrade Silva, Sergio Neves Monteiro
Abstract: Civil construction materials such as brick, concrete and mortar have been incorporated with compatible wastes aiming at both reducing costs and providing an environmentally correct destination for the waste. In the present work, a sludge waste from a paper industry was added in different amounts, up to 20 wt%, into the lime used to produce mortar in mixture with sand and cement. Standard consistency tests of the pasty, as-prepared, mortar as well as flexural and compressive tests of the solid, as-cured, mortar were performed. The results indicated that the addition of up to 10 wt% of paper sludge waste into the lime increased the mortar consistency and up to 20 wt% addition also improved the mechanical strength of the cured mortar.
609
Authors: Peng Zhao, De Qing Xie, Guang Yan Li, Yun Sheng Zhang
Abstract: Portland cement has low chemical and physical affinity for traditional building materials. This hinders the restoration of historical buildings and modern rustic architecture where blue bricks are used. Pig blood–lime mortar is one of the most important technological inventions in the Chinese architectural history. Mortar in this work was fabricated according to formulas of the literature, and some analyses were conducted for further understanding their microstructure. Environmental scanning electron microscopy was utilized to analyze mechanism of interaction between key components of ancient mortar bonding materials. Results show that pig blood accelerates the formation of microstructure at early stage. Pig blood plays the role of biological templates which regulates the growth of calcium carbonate crystal.
496
Authors: Monika Čáchová, Eva Vejmelková, Martin Keppert, Lukáš Fiala
Abstract: Recycled finely crushed brick appears to be a suitable additive to lime or cement binder in render mixtures. This waste material indicates good pozzolanic properties and actively takes part in formation of chemical bonds in materials structure. The main objective of this paper is to find an appropriate ratio of waste crushed brick that is used as a replacement of other constituents represented by lime hydrate and silica sand. Besides it aims to find out a perspective utilization of such a waste material. Finely crushed brick originates from the production of thermal insulating brick blocks which is ecologically and economically advantageous. In this work, results of measured material parameters of render mixtures with different replacement ratios of binder (lime hydrate) and simultaneously filler (silica sand) by finely crushed brick are presented. Among the studied parameters basic physical properties (measured by water vacuum saturation method and by helium pycnometry), characterization of pore system (by mercury porosimetry) and thermal characteristics are presented.
7
Authors: Amin Eisazadeh, Khairul Anuar Kassim, Hadi Nur
Abstract: In this research, the time-dependent changes induced in charge characteristics of phosphoric acid and lime treated quartz-rich kaolinitic soil were investigated. Also, in order to study the relationship between the exchange capacity and the pore water chemistry, pH measurements was performed on cured samples. Based on the collected data, it was found that the pH of stabilized soils showed a tendency for reaching soil’s natural pH with increasing curing time. In addition, the increase in number of broken bonds around the edges of soil particles and also the formation of cementitious compounds that acquired negative charges contributed to achieving higher CECp values at longer curing periods. From engineering point of view, the lime treated samples revealed the highest degree of improvement with an approximately 16-fold strength increase in comparison to the natural soil over an 8 months curing period.
2766
Authors: Richard J. Ball, Giovanni L.A. Pesce, Chris R. Bowen, Geoffrey C. Allen
Abstract: This paper describes the study of lime/metakaolin pastes using impedance spectroscopy during the first three weeks after mixing. Changes in the composition, structure and morphology were obtained using scanning electron microscopy, energy dispersive analysis of X-rays, differential scanning calorimetry, thermal gravimetric analysis and mercury intrusion porosimetry. The impedance data was studied with reference to changes in ac conductivity, relative permittivity and bulk resistance. Electrical behaviour was found consistent with structural and compositional changes. This study highlights the importance of impedance spectroscopy as a method for the non destructive monitoring and evaluation of lime based hydraulic binders.
487
Authors: Radek Ševčík, Petr Šašek, Marta Pérez-Estébanez, Alberto Viani
Abstract: The characterization of historic lime mortars is crucial for many cultural heritage conservation issues. In this work, the characterization of a historical lime mortar is described. Samples for chemical analysis were obtained after different milling times and using the RILEM acid digestion method on several replicates. Qualitative and quantitative determination of phases in the mortar and in the residues after acid attack and the potential presence of CaCO3 polymorphs, were accomplished with X-ray powder diffraction. Results suggest that representativeness of the sample and the homogenisation, although not always achievable in conservation practice, are strongly affecting results.
17
Authors: Jun Yang, Jian Ling Wang, Guo Dong Zhang, Yun Wei Tang, Zhi Gang Xie
Abstract: Based on the improved trial test of a construction section of expansive soil subgrade filling in Small Crow first class road in Yi Chang, a comparative analysis about the improvement on the swell-shrink performance of expansive soil test sample by adding lime, cement, fly ash, weathered sand is made. From the applicability and economic perspective, weathered sand improvement with the best effect. The best construction mixing sand ratio for medium and strong expansive soil is determined as10%, the expansive soil after improved treatment can be used as the first class road subgrade filling.
574
Authors: Jaroslav Topič, Andrej Osvald, Václav Nežerka, Zdeněk Prošek, Martin Lidmila, Jan Valentin, Pavel Tesárek
Abstract: Several different types of aggregates were used for production of tested samples, namely: the standard sand of a fraction 0-4 mm, quartz sand of a fraction 0-0.4 mm, finely ground recycled limestone powder of a fraction 0-0.07 mm, finely ground recycled concrete of a fraction 0-0.13 mm (ground by Lavaris Company), and finally crushed bricks of a fraction 2-5 mm. The Portland cement CEM I 42.5 R produced in Radotín was used as a binder. Testing was carried out on prismatic samples of dimensions 40 × 40 × 160 mm. Compressive strength and static Young ́s modulus were measured for individual samples and these differed by the type of a microfiller and its amount.
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