Thermal conductivity coefficient of cement-based mortars as air relative humidity function

Siwińska, A.; Garbalińska, H.

doi:10.1007/s00231-011-0772-1

Cited by 38 publications

(12 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Modern building materials should meet minimum mechanical property and durability requirements so as to be successfully used in construction fields. Furthermore, it has been suggested that energy savings can be made through the proper insulation of a structure; therefore, thermal conductivity is becoming an important factor in determining the properties of modern building materials [ 30 ]. This study is aimed to evaluate the effect of crushed and expanded WG in production of lightweight concretes and their effect on thermal and mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Effects of Crushed and Expanded Waste Glass Aggregates on the Material Properties of Lightweight Concrete Using Image-Based Approaches

et al. 2017

View full text Add to dashboard Cite

Recently, the recycling of waste glass has become a worldwide issue in the reduction of waste and energy consumption. Waste glass can be utilized in construction materials, and understanding its effects on material properties is crucial in developing advanced materials. In this study, recycled crushed and expanded glasses are used as lightweight aggregates for concrete, and their relation to the material characteristics and properties is investigated using several approaches. Lightweight concrete specimens containing only crushed and expanded waste glass as fine aggregates are produced, and their pore and structural characteristics are examined using image-based methods, such as scanning electron microscopy (SEM), X-ray computed tomography (CT), and automated image analysis (RapidAir). The thermal properties of the materials are measured using both Hot Disk and ISOMET devices to enhance measurement accuracy. Mechanical properties are also evaluated, and the correlation between material characteristics and properties is evaluated. As a control group, a concrete specimen with natural fine sand is prepared, and its characteristics are compared with those of the specimens containing crushed and expanded waste glass aggregates. The obtained results support the usability of crushed and expanded waste glass aggregates as alternative lightweight aggregates.

show abstract

Section: Introductionmentioning

confidence: 99%

Evaluation of the Effects of Crushed and Expanded Waste Glass Aggregates on the Material Properties of Lightweight Concrete Using Image-Based Approaches

et al. 2017

View full text Add to dashboard Cite

show abstract

“…The thermal conductivity λ [W/(m.°C)] and heat capacity C v [J/(kg.°C)] of the concrete samples were determined using heat transfer analyzer model ISOMET 2104 (Slovakia) [17][18][19]. The tests were conducted at a temperature of 20 ± 5°C and a relative humidity of 90-95 % using concrete samples of 25 × 25 × 6 cm in size.…”

Section: Test Methodsmentioning

confidence: 99%

An Early-age Evaluation of Thermal Cracking Index of Heavy Concrete Applying for Airport Pavement

Nguyen

Лам

Huynh

2020

Period. Polytech. Civil Eng.

View full text Add to dashboard Cite

Industrial waste management has been an integral part of many countries in the world, including in Vietnam. In which, bottom ash (BA) has been used as a pozzolanic additive in compositions of the heavy concrete applying for airport concrete pavement (ACP), which allows reducing the hydration heat, the cost, and the thermal cracking of the concrete during the construction process. The purpose of this study is to summarize the experimental laboratory results of the heavy concrete samples containing 35 % BA sourced from a thermal power plant in Vietnam. The mechanical and thermal properties of the heavy concrete samples were determined at different curing ages. Besides, the heat of cement hydration during the preparation of the heavy concrete in the laboratory was measured using a "TAM AIR" isothermal calorimeter. Moreover, the Midas civil computer software based on the finite element method was used to analyze the temperature field and thermal cracking index of the ACP at the early ages. As the results, the heavy concrete had the respective thermal conductivity and the average of specific heat of 1.1 W/(m.°C) and 878.35 J/(kg.°C). Moreover, the value of thermal cracking index indicates that no cracking occurred on the ACP at the early ages. Furthermore, the results of the present study can be considered as a useful reference source for future projects that are associated with the construction of the ACP.

show abstract

“…The thermal conductivity coefficient was determined for the dry state. Exposing the mortar to humidity can result in a deterioration of the parameter [Siwińska and Garbalińska, 2011]. The incinerated sewage sludge decreases the overall bulk density of mortars, due to the high porosity of aggregates.…”

Section: Properties Of Cement Mortars With Waste Aggregatementioning

confidence: 99%

Use of Sustainable Fine-Grain Aggregates in Cement Composites

Rucińska¹

2019

J. Ecol. Eng.

View full text Add to dashboard Cite

The previous research and the analyses from various research centers indicate the usefulness of the aggregates obtained from waste in the construction materials technology, although their technical parameters are not always comparable to the properties of traditional materials manufactured on the basis of primary raw materials. However, with a very large variety of expected technical features, these slightly lower parameters may be sufficient for use in engineering facilities. Mortars and concretes are the most popular group of materials, where aggregates obtained from waste can be used without any problems. The presented characteristics of the properties of fine aggregates, which were produced by grinding concrete and ceramic debris, as well as the fragmentation of municipal sewage sludge, in connection with the properties of cement mortars, is a clear example of this. The study showed that the cement mortars, in which natural aggregate was replaced by waste glass with the same granulation, confirmed their usefulness as mortar for building masonry, or underlays for floors. However, the fact that carrying out the process of fragmentation of waste to adequately fine granulation on an industrial scale is highly inconvenient, cannot be omitted. There are no difficulties in obtaining the aggregates with larger grains, which are used in hardening unpaved roads or as a concrete component. Obtaining finer grains of recycled aggregate becomes more challenging. Overcoming this obstacle will make the fine-grained aggregates obtained through the recycling of waste materials a viable alternative to the natural aggregates. This will contribute to the reduction of the extraction of natural sands, and thus to the protection of the natural environment.

show abstract

Thermal conductivity coefficient of cement-based mortars as air relative humidity function

Cited by 38 publications

References 13 publications

Evaluation of the Effects of Crushed and Expanded Waste Glass Aggregates on the Material Properties of Lightweight Concrete Using Image-Based Approaches

Evaluation of the Effects of Crushed and Expanded Waste Glass Aggregates on the Material Properties of Lightweight Concrete Using Image-Based Approaches

An Early-age Evaluation of Thermal Cracking Index of Heavy Concrete Applying for Airport Pavement

Use of Sustainable Fine-Grain Aggregates in Cement Composites

Contact Info

Product

Resources

About