Effect of phase-change materials on the hydration and mineralogy of cement mortar

2020 ◽  
pp. 1-11
Author(s):  
Kusumadhar Snehal ◽  
Bibhuti Bhusan Das
Keyword(s):  
Phase Change ◽  
Phase Change Materials ◽  
Cement Mortar

scholarly journals Feasibility of Using Phase Change Materials to Control the Heat of Hydration in Massive Concrete Structures

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Won-Chang Choi ◽  
Bae-Soo Khil ◽  
Young-Seok Chae ◽  
Qi-Bo Liang ◽  
Hyun-Do Yun
Keyword(s):  
Phase Change ◽  
Latent Heat ◽  
Phase Change Materials ◽  
Cement Mortar ◽  
Concrete Structures ◽  
Experimental Tests ◽  
Heat Of Hydration ◽  
Hydration Heat ◽  
Experimental Results ◽  
Mass Concrete

This paper presents experimental results that can be applied to select a possible phase change material (PCM), such as a latent heat material (LHM), to control the hydration heat in mass concrete structures. Five experimental tests (microconduction, simplified adiabatic temperature rise, heat, and compressive strength tests) were conducted to select the most desirable LHM out of seven types of inorganic PCM used in cement mortar and to determine the most suitable mix design. The results of these experimental tests were used to assess the feasibility of using PCM to reduce hydration heat in mass concrete that was examined. The experimental results show that cement mortar containing barium- [Ba(OH)2·8H2O] based PCM has the lowest amount of total hydration heat of the cement pastes. The barium-based PCM provides good latent heat properties that help to prevent volume change and microcracks caused by thermal stress in mass concrete.

scholarly journals Microstructure and Mechanical Properties of Cement Mortar Containing Phase Change Materials

2019 ◽  
Vol 9 (5) ◽  
pp. 943 ◽  
Author(s):  
Hyun-Do Yun ◽  
Jong-Won Lee ◽  
Young-Il Jang ◽  
Seok-Joon Jang ◽  
Wonchang Choi
Keyword(s):  
Phase Change ◽  
Phase Change Materials ◽  
Cement Mortar ◽  
Microstructural Analysis ◽  
Hydration Heat ◽  
Maximum Temperature ◽  
Release Time ◽  
Microstructural Characteristics ◽  
Significant Difference

This paper presents an investigation of the characterization of cement mortar containing phase change materials (PCMs) in order to control the development of hydration heat. The study examined microstructural characteristics and properties of cement mortar with PCMs such as flow, compressive strength, and flexural strength. This research involved two types of PCM and up to 15% cement added to cement mortar mixtures. The two types of PCM used in this study are PCM with barium (PCM-Ba) and PCM with strontium (PCM-Sr). The experimental results indicate that both the incremental temperature rise and the maximum temperature release time of PCM up to 5% addition are delayed. Both PCM-Ba and PCM-Sr are effective in reducing the development of hydration heat. The microstructural analysis results show that the crystalloid content of cement mortar without PCMs is about 3% more from cement mortar with PCMs, regardless of the type of PCMs used, and that no significant difference is evident in the formation of crystals between cement mortar with and without PCMs.

Enhance the Thermal Storage of Cement-Based Composites With Phase Change Materials and Carbon Nanotubes

2013 ◽  
Vol 135 (2) ◽  
Author(s):  
Baoguo Han ◽  
Kun Zhang ◽  
Xun Yu
Keyword(s):  
Carbon Nanotubes ◽  
Phase Change ◽  
Building Materials ◽  
Phase Change Materials ◽  
Cement Mortar ◽  
Construction Materials ◽  
Thermal Storage ◽  
Building Models ◽  
Scale Down ◽  
Mechanical Performances

Phase change materials (PCM) have been incorporated with cementitious construction materials to store thermal energy and control interior climate in buildings, which can reduce the energy consumption and improve thermal comfort. However, addition of PCM is found to decrease strength and thermal conductivity of the cement-based composite. Carbon nanotubes (CNT) are integrated into cementitious construction materials with microencapsulated PCM to improve their thermal-conductive and mechanical performances. Results of lab and outdoor tests show the modified cement mortar containing both PCM and CNT exhibits better heat insulation properties than plain cement mortar. A temperature difference up to 6.8 °C was observed between interiors of two same size scale-down building models (one made of plain cement mortar, the other one made of cement mortar with PCM and CNT). This indicates that the modified cement mortar can effectively enhance the thermal storage property of cement-based building materials.

scholarly journals Effect of Paraffin and Silica Matrix Phase Change Materials on Properties of Portland Cement Mortars

Materials ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 921
Author(s):  
Vicente Zetola ◽  
Luis J. Claros-Marfil ◽  
Alfonso García Santos ◽  
Fco. Javier Neila González
Keyword(s):  
Portland Cement ◽  
Phase Change ◽  
Phase Change Materials ◽  
Cement Mortar ◽  
Silica Matrix ◽  
Mix Design ◽  
Limited Data ◽  
Air Content ◽  
Cement Mortars ◽  
Maximum Compressive Strength

In the search for methods to incorporate Phase Change Materials (PCM) into Portland cement mortar mixtures, PCM based on paraffins adhered to a silica-based matrix appear as a suitable option. However, paraffin particles have been observed to escape from the silica matrix when water is added. There are only limited data on how the use of such PCM affects the behaviour of mortars. To evaluate the effect of this PCM addition, Portland mortar mixtures were elaborated with 5%, 10% and 15% of PCM content, and using CEM 42.5 I R and CEM I 52.5 R cement types. Physical properties such as density, open porosity, air content and water absorption were analysed for fresh and dry samples. The results obtained show that the PCM-added mixtures require greater water and cement amounts than the standard mortar mixtures to achieve similar compressive strengths. Compared to non-PCM mixtures the PCM-added mortars present a density lowering of 37% for fresh mixtures and near 45% for dry state forms. A maximum compressive strength of 15.9 MPa was reached for 15% PCM mixtures, while values beyond 40 MPa were achieved for 5% PCM mixtures. Thus, the proposed study contributes to broad the available knowledge of PCM cement mortar mixtures behaviour and their mix design.

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