Performance Change in Superplasticizers after Thermal Stimulation

2021 ◽  
Vol 896 ◽  
pp. 157-163
Author(s):  
Mizuki Takigawa ◽  
Nana Katsuoka ◽  
Shin Ichiro Hashimoto ◽  
Shigeyuki Date
Keyword(s):  
Physical Properties ◽  
Environmental Temperature ◽  
Thermal Stimulation ◽  
Polycarboxylic Acid ◽  
Environment Changes ◽  
Performance Change ◽  
Long Term Storage ◽  
Term Storage ◽  
Polymer Entanglement

Polycarboxylic acid-based superplasticizers are used for all types of concrete, but it is not well known that their fundamental performance changes with heating. Previous research confirmed that the superplasticizer storage environment changes its physical properties, which in turn changes the fluidity and workability of concrete or mortar. Therefore, this study confirmed the thermal stimulation effect on polycarboxylic acid-based and other superplasticizers and also confirmed the mechanism of polymer “entanglement” using superplasticizers that were centrifuged to simulate long-term storage. Based on the results, it was confirmed that the change in physical properties due to the change in environmental temperature is specific to polycarboxylic acid-based superplasticizers. It was also confirmed that centrifugal treatment of the superplasticizer slightly decreased its performance but increased the effect of thermal stimulation.

scholarly journals Properties of Fiberboard Overpack Material in the 9975 Shipping Package Following Thermal Aging

2007 ◽  
Author(s):  
W. L. Daugherty
Keyword(s):  
Service Life ◽  
Physical Properties ◽  
Thermal Aging ◽  
Impact Resistance ◽  
Storage Conditions ◽  
Radioactive Material ◽  
Long Term Storage ◽  
Term Storage ◽  
Over Time

Many radioactive material shipping packages incorporate cane fiberboard overpacks for thermal insulation and impact resistance. Mechanical, thermal and physical properties have been measured on cane fiberboard following thermal aging in several temperature/humidity environments. Several of the measured properties change significantly over time in the more severe environments, while other properties are relatively constant. These properties continue to be tracked, with the goal of developing a model for predicting a service life under long-term storage conditions.

Physical Properties and Volatile Composition Changes of Cooked Sausages Stuffed in a New Casing Formulation Based in Surfactants and Lactic Acid During Long-Term Storage

2017 ◽  
Vol 82 (3) ◽  
pp. 594-604 ◽  
Author(s):  
Chao-Hui Feng ◽  
Cheng Li ◽  
Juan Francisco García-Martín ◽  
Pradeep Kumar Malakar ◽  
Yue Yan ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Physical Properties ◽  
Volatile Composition ◽  
Long Term Storage ◽  
Composition Changes ◽  
Term Storage

Physical Property Changes in Commercial Natural Rubbers during Long Term Storage

2006 ◽  
Vol 79 (1) ◽  
pp. 72-81 ◽  
Author(s):  
Jintana Yunyongwattanakorn ◽  
Jitladda T. Sakdapipanich
Keyword(s):  
Physical Properties ◽  
Storage Time ◽  
Physical Property ◽  
Gel Content ◽  
Long Term Storage ◽  
Property Changes ◽  
Term Storage ◽  
Clear Relation ◽  
Long Storage

Abstract The physical properties during long term storage of selected commercial Standard Thai Rubbers (STR), i.e. STR XL, STR 5L and STR CV60 as high-graded natural rubber (NR), were investigated. Sections of commercial NR were subjected to examination after storage-hardening. STR 5L showed clearly an increase in Mooney viscosity (VR), Mooney relaxtion (MR30), gel content and initial plasticity (P0), higher than that of STR XL. This result suggests that STR 5L exhibits the highest inconsistency in physical properties. The increasing viscosity and gel content of STR 5L and STR XL samples suggest the occurrence of a crosslink structure during storage. STR CV60, known as a viscosity-stabilized NR sample, also showed an increase in VR, gel content, P0, and high PRI value during long storage. These findings indicate that storage-hardening occurred in the rubber samples even after carefully controlled production procedures. As for the different sections of samples, there was no clear relation with gel content with respect to storage time, indicating that depth or positions of specimens in a certain rubber bale did not affect the storage-hardening phenomenon.

scholarly journals Impact of the Persistence of Three Essential Oils with Antifungal Activities on Stored Wheat Grains, Flour, and Baked Products

Foods ◽  
2021 ◽  
Vol 10 (2) ◽  
pp. 213
Author(s):  
Zaida N. Juárez ◽  
Horacio Bach ◽  
María E. Bárcenas-Pozos ◽  
Luis R. Hernández
Keyword(s):  
Physical Properties ◽  
Essential Oils ◽  
Health Concern ◽  
Health Concerns ◽  
Wheat Grains ◽  
Stored Wheat ◽  
Long Term Storage ◽  
Baked Products ◽  
Term Storage

Wheat grains are exposed to several plagues after harvesting and during storage. These plagues include bacteria, fungi, and insects with detrimental outcomes to their quality and heavy losses to the farmers. Fungi are of special interest because of their ability to produce mycotoxins with health concerns. Once grains are harvested, synthetic fungicides, which are sprayed before long-term storage, normally control fungi; however, these synthetic products represent a health concern because of their toxicities. Previously, we reported the antifungal activity of the essential oils extracted from Porophyllum linaria, Agastache mexicana, and Buddleja perfoliata against fungal strains isolated from stored wheat. In this study, we sprayed wheat grains with the same essential oils to measure their persistence interval and to prepare baked products to assess potential changes in their physical properties. The persistence interval of the essential oils in grains indicated that it takes between 63 and 134 days to eliminate 90% of the original compounds. This extended time of the compounds in the grains together with a lack of physical properties modifications of the flour and baked products (post-treatment) suggest that the presence of oils in the grains is potentially safe to use. The solid data denote the technological feasibility of the treatment and the possible management of residues through adequate safety intervals.

Modelling of Moisture Movement in Wood during Outdoor Storage

2001 ◽  
Vol 6 (2) ◽  
pp. 3-14 ◽  
Author(s):  
R. Baronas ◽  
F. Ivanauskas ◽  
I. Juodeikienė ◽  
A. Kajalavičius
Keyword(s):  
Experimental Data ◽  
Finite Difference ◽  
Climatic Conditions ◽  
Two Dimensional ◽  
Moisture Movement ◽  
Finite Difference Technique ◽  
Long Term Storage ◽  
Space Formulation ◽  
Term Storage

A model of moisture movement in wood is presented in this paper in a two-dimensional-in-space formulation. The finite-difference technique has been used in order to obtain the solution of the problem. The model was applied to predict the moisture content in sawn boards from pine during long term storage under outdoor climatic conditions. The satisfactory agreement between the numerical solution and experimental data was obtained.

Trehalose: a cryoprotectant that enhances recovery and preserves function of human pancreatic islets after long-term storage

Diabetes ◽  
1997 ◽  
Vol 46 (3) ◽  
pp. 519-523 ◽  
Author(s):  
G. M. Beattie ◽  
J. H. Crowe ◽  
A. D. Lopez ◽  
V. Cirulli ◽  
C. Ricordi ◽  
...  
Keyword(s):  
Pancreatic Islets ◽  
Human Pancreatic Islets ◽  
Long Term Storage ◽  
Term Storage
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