scholarly journals STUDY ON DISTRIBUTION OF DRYING AND HYDRATION REACTION IN MORTAR BY EARLY-AGE DEMOLDING─VISUALIZATION OF WATER LOSS AND EVALUATION OF WATER CONTENT USING X-RAY CR─

2021 ◽  
Vol 74 (1) ◽  
pp. 82-89
Author(s):  
Shota UMEKI ◽  
Tetsuya FUJIMAKI ◽  
Yuki YOKOUCHI ◽  
Ippei MARUYAMA
Keyword(s):  
Water Content ◽  
Water Loss ◽  
Early Age ◽  
Hydration Reaction ◽  
X Ray

scholarly journals Multidimensional Ln-Aminophthalate Photoluminescent Coordination Polymers

Materials ◽  
2021 ◽  
Vol 14 (7) ◽  
pp. 1786
Author(s):  
Carla Queirós ◽  
Chen Sun ◽  
Ana M. G. Silva ◽  
Baltazar de Castro ◽  
Juan Cabanillas-Gonzalez ◽  
...  
Keyword(s):  
Water Content ◽  
Coordination Polymers ◽  
Metal Ion ◽  
Low Cost ◽  
Microwave Assisted Synthesis ◽  
X Ray Diffraction ◽  
X Ray ◽  
Wide Range ◽  
Ft Ir ◽  
Ft Ir Spectroscopy

The development of straightforward reproducible methods for the preparation of new photoluminescent coordination polymers (CPs) is an important goal in luminescence and chemical sensing fields. Isophthalic acid derivatives have been reported for a wide range of applications, and in addition to their relatively low cost, have encouraged its use in the preparation of novel lanthanide-based coordination polymers (LnCPs). Considering that the photoluminescent properties of these CPs are highly dependent on the existence of water molecules in the crystal structure, our research efforts are now focused on the preparation of CP with the lowest water content possible, while considering a green chemistry approach. One- and two-dimensional (1D and 2D) LnCPs were prepared from 5-aminoisophthalic acid and Sm3+/Tb3+ using hydrothermal and/or microwave-assisted synthesis. The unprecedented LnCPs were characterized by single-crystal X-ray diffraction (SCRXD), powder X-ray diffraction (PXRD), Fourier transform infrared (FT-IR) spectroscopy and scanning electron microscopy (SEM), and their photoluminescence (PL) properties were studied in the solid state, at room temperature, using the CPs as powders and encapsulated in poly(methyl methacrylate (PMMA) films, envisaging the potential preparation of devices for sensing. The materials revealed interesting PL properties that depend on the dimensionality, metal ion, co-ligand used and water content.

scholarly journals Reply [to “Comment on ‘Dual-energy synchrotron X ray measurements of rapid soil density and water content changes in swelling soils during infiltration’ by Patricia Garnier et al.”]

1999 ◽  
Vol 35 (11) ◽  
pp. 3589-3590 ◽  
Author(s):  
Patricia Garnier ◽  
Rafael Angulo-Jaramillo ◽  
David A. DiCarlo ◽  
Tim W. J. Bauters ◽  
Christophe J. G. Darnault ◽  
...  
Keyword(s):  
Water Content ◽  
Dual Energy ◽  
Soil Density ◽  
X Ray ◽  
Swelling Soils

Dual-energy synchrotron X ray measurements of rapid soil density and water content changes in swelling soils during infiltration

1998 ◽  
Vol 34 (11) ◽  
pp. 2837-2842 ◽  
Author(s):  
Patricia Garnier ◽  
Rafael Angulo-Jaramillo ◽  
David A. DiCarlo ◽  
Tim W. J. Bauters ◽  
Christophe J. G. Darnault ◽  
...  
Keyword(s):  
Water Content ◽  
Dual Energy ◽  
Soil Density ◽  
X Ray ◽  
Swelling Soils

scholarly journals Effects of Initial Water Content on Microstructure and Mechanical Properties of Lean Clay Soil Stabilized by Compound Calcium-Based Stabilizer

Materials ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 1933 ◽  
Author(s):  
Chenglong Yin ◽  
Wei Zhang ◽  
Xunli Jiang ◽  
Zhiyi Huang
Keyword(s):  
Water Content ◽  
Soil Stabilization ◽  
Clay Soil ◽  
Soil Aggregates ◽  
Optical Microscope ◽  
Initial Water Content ◽  
Reaction Products ◽  
Unconfined Compression Test ◽  
Initial Water ◽  
X Ray

Initial water content significantly affects the efficiency of soil stabilization. In this study, the effects of initial water content on the compressibility, strength, microstructure, and composition of a lean clay soil stabilized by compound calcium-based stabilizer were investigated by static compaction test, unconfined compression test, optical microscope observations, environment scanning electron microscopy, energy dispersive X-ray spectroscopy, and X-ray diffraction. The results indicate that as the initial water content increases in the range studied, both the compaction energy and the maximum compaction force decrease linearly and there are less soil aggregates or agglomerations, and a smaller proportion of large pores in the compacted mixture structure. In addition, for specimens cured with or without external water supply and under different compaction degrees, the variation law of the unconfined compressive strength with initial water content is different and the highest strength value is obtained at various initial water contents. With the increase of initial water content, the percentage of the oxygen element tends to increase in the reaction products of the calcium-based stabilizer, whereas the primary mineral composition of the soil-stabilizer mixture did not change notably.

The Effect of Anhydrite on the Hydration of CFBC Ash-Clinker-Water System

2011 ◽  
Vol 287-290 ◽  
pp. 754-757
Author(s):  
Hui Zhong Xu ◽  
Yuan Ming Song ◽  
Bo Wang
Keyword(s):  
Water Content ◽  
Significant Role ◽  
Water System ◽  
X Ray Diffraction ◽  
X Ray

The effect of anhydrite on the hydration of CFBC ash-clinker-water system was investigated by ettringite content, chemically combined water content and X-ray diffraction. The results show that the effect of anhydrite on ettringite content at earlier age is significantly greater than that at later age. This work confirms that anhydrite plays a significant role in promoting the hydration of CFBC ash-clinker-water system.

Effect of Fly Ash on the early Age Cracking Performance of Cement Paste

2014 ◽  
Vol 584-586 ◽  
pp. 894-898
Author(s):  
Ping Zhang ◽  
Guan Guo Liu ◽  
Chao Ming Pang ◽  
Bing Du ◽  
Hong Gen Qin
Keyword(s):  
Computed Tomography ◽  
Fly Ash ◽  
Cement Paste ◽  
Test Method ◽  
Early Age ◽  
Cement Ratio ◽  
X Ray ◽  
Cracking Performance ◽  
X Ray Computed ◽  
Ct Test

The X ray computed tomography (X-CT) was applied to test the cracking resistance of cement paste, and the hydration process was monitored to study the effect of fly ash on the early age cracking performance. The results showed that the hydration heat reduced with the increase of fly ash under the same water-cement ratio. Within 24h, the porosity increased with time. The addition of fly ash increased the proportion of large holes and then changed the internal stress state. Using X-CT test method and by comparing the number of cracks, the sample with 20% FA was found to have the most serious cracks, whereas the sample with 30% FA had the best crack resistance.

Phase relationships in the join Ca(OH)2–CaCO3–Ca3(PO4)2–H2O at 1000 bars

1969 ◽  
Vol 37 (285) ◽  
pp. 75-82 ◽  
Author(s):  
G. M. Biggar
Keyword(s):  
Phase Equilibria ◽  
Water Content ◽  
X Ray Diffraction ◽  
X Ray ◽  
Synthetic Hydroxyapatite ◽  
Diffraction Patterns ◽  
Phase Relationships

SummaryPhase equilibria involving calcite, apatite, portlandite, liquid, and vapour were determined at 1000 bars. Calcite, apatite, and portlandite melt at 654 °C to form a liquid of composition (wt %), Ca(OH)2 53 %, CaCO3 46 %, Ca3(PO4)2 1 %. With water present melting occurs at 635 °C to form a similar liquid with a low water content. The X-ray diffraction patterns of the equilibrium apatites were not significantly different from synthetic hydroxyapatite.

Sign in / Sign up

Export Citation Format

Share Document