Alkali-activated cement-based binder mortars containing phase change materials (PCMs): mechanical properties and cost analysis

2018 ◽  
Vol 24 (8) ◽  
pp. 1068-1090 ◽  
Author(s):  
M. Kheradmand ◽  
Z. Abdollahnejad ◽  
F. Pacheco-Torgal
Keyword(s):  
Mechanical Properties ◽  
Cost Analysis ◽  
Phase Change ◽  
Phase Change Materials ◽  
Alkali Activated ◽  
Alkali Activated Cement

scholarly journals Alkali-Activated Cements for TES Materials in Buildings’ Envelops Formulated With Glass Cullet Recycling Waste and Microencapsulated Phase Change Materials

Materials ◽  
2019 ◽  
Vol 12 (13) ◽  
pp. 2144 ◽  
Author(s):  
Jessica Giro-Paloma ◽  
Camila Barreneche ◽  
Alex Maldonado-Alameda ◽  
Miquel Royo ◽  
Joan Formosa ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Energy Storage ◽  
Phase Change ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Phase Change Materials ◽  
Glass Cullet ◽  
Microencapsulated Phase Change Materials ◽  
Building Walls ◽  
Alkali Activated

Within the thermal energy storage field, one of the main challenges of this study is the development of new enhanced heat storage materials to be used in the building sector. The purpose of this study is the development of alkali-activated cements (AACs) with mechanical properties to store high amounts of heat. These AACs incorporate wastes from industrial glass process as well as microencapsulated phase change materials (mPCMs) to improve the thermal inertia of building walls, and accordingly respective energy savings. The research presented below consists of the exhaustive characterization of different AACs formulated from some waste generated during the proper management of municipal waste used as precursor. In this case study, AACs were formulated with the waste generated during the recycling of glass cullet, namely ceramic, stone, and porcelain (CSP), which is embedding a mPCM. The addition of mPCM was used as thermal energy storage (TES) material. The mechanical properties were also evaluated in order to test the feasibility of the use of the new formulated materials as a passive TES system. The results showed that the AAC obtained from CSP (precursors) mixed with mPCMs to obtain a thermal regulator material to be implemented in building walls was reached successfully. The material developed was resistant enough to perform as insulating panels. The formulated materials had high storage capacity depending on the PCM content. The durability of the mPCM shell was studied in contact with alkaline medium (NaOH 4 M) and no degradation was confirmed. Moreover, the higher the content of mPCM, the lower the mechanical properties expected, due to the porosity increments with mPCM incorporation in the formulations.

MECHANICAL PROPERTIES OF FLY ASH-BASED ALKALI-ACTIVATED CEMENT USING A STATISTICAL ANALYSIS TECHNIQUE

2014 ◽  
Vol 1 (1) ◽  
Author(s):  
Hyuk Lee ◽  
Vanissorn Vimonsatit
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Statistical Analysis ◽  
Fly Ash ◽  
Silica Fume ◽  
Dry Density ◽  
Analysis Method ◽  
Solid Ratio ◽  
Alkali Activated ◽  
Alkali Activated Cement

This paper presents the mechanical properties of fly ash-based alkali-activated cement (AAC). A statistical analysis method was used to determine the effect of mix proportion parameters on the dry density and compressive strength of fly ash-based AAC pastes and mortars. For that purpose, sample mixtures were designed according to Taguchi’s experimental design method, i.e., in a L9 orthogonal array. Four factors were selected: “silica fume content” (SF), “sand to solid ratio” (s/c), “liquid to solid ratio” (l/s), and “superplasticiser content” (SP). The experimental results were analysed by using signal to noise for quality control of each mixture, and analysis of variance (ANOVA) was used to determine the significant effect on the compressive strength of fly ash-based AAC. Furthermore, a regression-analysis method was used to predict the compressive strength according to the variation of the four factors. Results indicated that silica fume is the most influencing parameter on compressive strength, which could be decreased by superplasticiser and l/s ratio. There is no significant effect of sand-to-cementitious ratio on compressive strength of fly ash-based AAC. The dry density decreases as the sand-to-cementitious ratio is decreased. The increasing l/s ratio and superplasticiser dosage could further decrease the dry density of fly ash-based AAC.

scholarly journals Influence of different sources of coal gangue used as aluminosilicate powder on the mechanical properties and microstructure of alkali-activated cement

2019 ◽  
Vol 69 (336) ◽  
pp. 199 ◽  
Author(s):  
B. J. Frasson ◽  
R. C.A. Pinto ◽  
J. C. Rocha
Keyword(s):  
Mechanical Properties ◽  
Coal Mining ◽  
Building Materials ◽  
Mechanical Performance ◽  
Pulse Velocity ◽  
Coal Gangue ◽  
Microstructural Development ◽  
Mining Wastes ◽  
Alkali Activated ◽  
Alkali Activated Cement

Coal mining wastes are associated with serious environmental problems; they have potential as building materials, including alkali-activated cement. In this study, the effect of different coal mining wastes on the mechanical properties and microstructural development of alkali-activated materials (AAMs) was evaluated through XRD, SEM and FTIR spectroscopy. Different alkali-activated compounds were produced; the alkaline solution was composed of NaOH+Na2SiO3. The results obtained using the calcined coal sludge showed excellent mechanical performance, with compressive strength higher than 60 MPa. However, addition of metakaolin and ordinary Portland cement was necessary to increase the mechanical performance of calcined coal gangue materials. The formation of N-A-S-H gel and the incorporation of iron ions into the cementitious matrix were evidenced. Ultrasonic pulse velocity indicated the early polymerization during the reaction processes. The study verified that the different characteristics of the wastes influence the performance of alkali-activated materials.

Study on the Thermal Properties of Paraffin/Expansion Perlite Composite Phase Change Mortar

2011 ◽  
Vol 374-377 ◽  
pp. 1274-1277 ◽  
Author(s):  
Qing Wang ◽  
Jing Zhang ◽  
Jing Da ◽  
Hui Zhao ◽  
Kun Ran
Keyword(s):  
Mechanical Properties ◽  
Thermal Properties ◽  
Phase Change ◽  
Phase Change Materials ◽  
Paraffin Wax ◽  
Expanded Perlite ◽  
Cooling Process ◽  
Heating And Cooling ◽  
As Adsorption

Phase change materials were prepared by the paraffin wax as phase change materials and expanded perlite as adsorption carrier in this paper. Phase change mortar was prepared by part of the sand been replaced. The heat ability which adjusts and stores heat in the heating and cooling process with different phase change materials was researched and its mechanical properties were tested and evaluated.

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