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.

scholarly journals The effect of microencapsulated phase change materials on the rheology of geopolymer and Portland cement mortars

2020 ◽  
Vol 103 (10) ◽  
pp. 5852-5869
Author(s):  
Shima Pilehvar ◽  
Anna M. Szczotok ◽  
Manuel Carmona ◽  
Ramón Pamies ◽  
Anna‐Lena Kjøniksen
Keyword(s):  
Portland Cement ◽  
Phase Change ◽  
Phase Change Materials ◽  
Cement Mortars ◽  
Microencapsulated Phase Change Materials

Multiphysics analysis of effects of encapsulated phase change materials (PCMs) in cement mortars

2019 ◽  
Vol 119 ◽  
pp. 51-63 ◽  
Author(s):  
Zakaria Ilyes Djamai ◽  
Ferdinando Salvatore ◽  
Amir Si Larbi ◽  
Gaochuang Cai ◽  
Mohamed El Mankibi
Keyword(s):  
Phase Change ◽  
Phase Change Materials ◽  
Cement Mortars

Effect of Delaying Addition of Heat Stimulated Superplasticizer on Fresh Properties of Mortar

2017 ◽  
Vol 890 ◽  
pp. 396-400 ◽  
Author(s):  
Zabihollah Tahery ◽  
Faraidoon Rahmanzai ◽  
Shigeyuki Date
Keyword(s):  
Portland Cement ◽  
Ordinary Portland Cement ◽  
Cement Mortar ◽  
Polycarboxylic Acid ◽  
Fresh Properties ◽  
External Temperature ◽  
Factors Affecting ◽  
Air Content ◽  
Heat Stimulation ◽  
Stimulation Of

To assure the quality and required workability of mortar or concrete, various types of superplasticizers are used. There are many factors affecting the performance of superplasticizers explicitly, type and dosage of the superplasticizers, type of cement, temperature and mixing procedure, as well as the addition times of the superplasticizers. Some researchers investigated the effect of delaying the addition time of superplasticizer to mortar or concrete, but there is not enough data about the effect of external temperature on performance of superplasticizers and consequent influences on fresh properties of mortar or concrete. In this research the effect of delaying the addition time of superplasticizers and influence of external temperature, namely, heat stimulation of superplasticizers, on fluidity, fresh density and air content of fresh cement mortar was investigated. Two types of Precast and Ready-Mix of Polycarboxylic acid-based ether superplasticizers with Ordinary Portland Cement was used. Delaying the addition time of superplasticizers enhanced the fluidity, slightly decreased the fresh density and increased the air content of mortar in comparison with simultaneous addition time with both heated and non-heated Superplasticizers.

STUDIES ON THE ACTION OF SULPHATES ON PORTLAND CEMENT: I. THE USE OF THE EXPANSION METHOD IN THE STUDY OF THE ACTION OF SULPHATES ON PORTLAND CEMENT MORTAR AND CONCRETE

1929 ◽  
Vol 1 (3) ◽  
pp. 273-284
Author(s):  
T. Thorvaldson ◽  
D. Wolochow ◽  
V. A. Vigfusson
Keyword(s):  
Experimental Data ◽  
Tensile Strength ◽  
Portland Cement ◽  
Cement Mortar ◽  
Expansion Method ◽  
Cement Mortars

This paper describes the methods employed in the use of expansion measurements as a means of studying the action of sulphates on Portland cement, and on Portland cement mortars. Experimental data are given dealing with the reproducibility of the expansion measurements and the relation between expansion and loss of tensile strength of mortars. Results obtained with standard sand mortars and graded sand mortars of varying richness of mix prepared from cements which differ in their resistance to sulphate action are presented.

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.

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