The Properties of Repair Cement Mortar with Insulation Performance under the Composite Deterioration Conditions

2011 ◽  
Vol 261-263 ◽  
pp. 98-103
Author(s):  
Se Hun Jeon ◽  
Myong Shin Song ◽  
Hyun Ju Kang ◽  
Young Jin Song
Keyword(s):  
Diffusion Coefficient ◽  
Temperature Change ◽  
Concrete Structure ◽  
Bending Strength ◽  
Cement Mortar ◽  
Lightweight Aggregate ◽  
Water Durability ◽  
Restorative Materials ◽  
Alumino Silicate ◽  
Insulation Performance

In this study, we studied on the durability of restorative cement mortar for deteriorated concrete at complex deteriorated conditions as variation of temperature and of humidities. We made a comparison between restorative materials with insulation function and restorative materials without insulation function in items of compressive and bending strength and permeability of water, durability for carbonation, salt damage, diffusion coefficient of salt at complex deterioration conditions like change of temperature, change of humidity, For insulation, we used close-pore type Alumino-Silicate lightweight aggregate and substituted 12 wt% and 15 wt% out of original restorative cement mortar without insulation function.As a result, it was found that original restorative cement mortar without insulation function fail to meet Korean Standard on polymer modified cement mortar for maintenance in concrete structure, but restorative cement mortar with insulation function is in contentment Korean Standard to meet excellent than restorative materials without insulation function for durability at complex deteriorated conditions.

scholarly journals Experimental Study on Effective Chloride Diffusion Coefficient of Cement Mortar by Different Electrical Accelerated Measurements

Crystals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 240
Author(s):  
Jianlan Chen ◽  
Jiandong Wang ◽  
Rui He ◽  
Huaizhu Shu ◽  
Chuanqing Fu
Keyword(s):  
Diffusion Coefficient ◽  
Cement Mortar ◽  
Early Stage ◽  
Chloride Concentration ◽  
Chloride Diffusion ◽  
Chloride Diffusion Coefficient ◽  
Cement Ratio ◽  
Water To Cement Ratio ◽  
Good Consistency ◽  
Determination Methods

This study investigated the effective chloride diffusion coefficient of cement mortar with different water-to-cement ratio (w/c) under electrical accelerated migration measurement. The cumulative chloride concentration in anode cell solution and the cumulative chloride concentration drop in the cathode cell solution was measured by RCT measurement and the results were further used to calculate the chloride diffusion coefficient by Nordtest Build 355 method and Truc method. The influence of w/c on cement mortar’s chloride coefficient was investigated and the chloride diffusion coefficient under different determination methods were compared with other researchers’ work, a good consistency between this work’s results and literatures’ results was obtained. The results indicated that the increased w/c of cement mortar samples will have a higher chloride diffusion coefficient. The cumulative chloride concentration drop in the cathode cell solution will have deviation in early stage measurement (before 60 h) which will result in overestimation of the effective chloride diffusion coefficient.

Preparation and Properties of SiC/Phenolic Resin for the Heat of LED

2016 ◽  
Vol 848 ◽  
pp. 454-459
Author(s):  
Cong Wu ◽  
Kang Zhao ◽  
Yu Fei Tang ◽  
Ji Yuan Ma
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Powder Metallurgy ◽  
Phenolic Resin ◽  
Bending Strength ◽  
Experimental Results ◽  
Low Thermal Conductivity ◽  
Industry Standard ◽  
Insulation Performance

In order to solve the problem that low thermal conductivity of the plastics for the heat of LED, SiC/Phenolic resin for the heat of LED were fabricated combining powder metallurgy. The effects of particles diameters, content and adding nanoparticles on thermal conductivity of the fabricated composites were investigated, the mechanical properties were also characterized. The experimental results showed that the materials were obtained, and the insulation performance of the fabricated SiC/Phenolic resin was higher than the industry standard one, the thermal conductivity reached 4.1W/(m·k)-1. And the bending strength of the fabricated composites was up to 68.11MPa. The problem of low thermal conductivity of the material is expected to be solved. In addition, it is meaningful for improving LED life.

Incorporation of expanded vermiculite lightweight aggregate in cement mortar

2018 ◽  
Vol 179 ◽  
pp. 302-306 ◽  
Author(s):  
Kim Hung Mo ◽  
Hong Jie Lee ◽  
Michael Yong Jing Liu ◽  
Tung-Chai Ling
Keyword(s):  
Cement Mortar ◽  
Lightweight Aggregate ◽  
Expanded Vermiculite

scholarly journals Damping Property of Cement Mortar Incorporating Damping Aggregate

Materials ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 792 ◽  
Author(s):  
Yaogang Tian ◽  
Dong Lu ◽  
Jianwei Zhou ◽  
Yuxuan Yang ◽  
Zhenjun Wang
Keyword(s):  
Mechanical Properties ◽  
Cement Mortar ◽  
Damping Ratio ◽  
Polypropylene Fiber ◽  
Lightweight Aggregate ◽  
Experimental Results ◽  
Optimal Dosage ◽  
Polymer Emulsion ◽  
Rubber Powder ◽  
Damping Property

This study proposes a new cement mortar incorporating damping aggregate (DA) and investigates the mechanical properties and damping property of the cement mortar. Four types of DA were prepared, lightweight aggregate presaturated water and three types of polymer emulsion. Further, the effects of polypropylene fiber and rubber powder on the performance of the cement mortar were studied. The experimental results showed that the damping ratio of specimens containing 70% DA was approximately three times higher than that of the reference mortar, with a slight decrease in the mechanical properties. Adding fiber was more effective than rubber powder in improving the damping ratio of the cement mortar, and the optimal dosage of fiber was 0.5%.

Influence of the Nanomaterials of Kaolin Content on the Chloride Permeability of Cement Mortar

2017 ◽  
Vol 730 ◽  
pp. 406-411 ◽  
Author(s):  
Xiao Yu Guo ◽  
Ying Fang Fan ◽  
Kun Yang
Keyword(s):  
Compressive Strength ◽  
Diffusion Coefficient ◽  
Cement Mortar ◽  
Chloride Diffusion ◽  
Chloride Diffusion Coefficient ◽  
Chloride Permeability

This study investigated the influence of nanokaolin content on the behavior of cement mortar at various curing ages. The fluidity, chloride permeability, bending and compressive strength of cement mortar with various nanokaolin additives were examined. The addition of 0%, 1%, 2%, 3%, 4%, 5% and 6% nanokaolin were taken into consideration. The results showed that the addition of nanokaolin decreases the fluidity of cement mortar, and the fluidity the cement mortar decreases with the increase of nanokaolin additives. It is obtained that the addition of nanokaolin increases both the bending and compressive strength of cement mortar, and with the increase of nanokaolin additives, the bending and compressive strength of cement mortar increase. The addition of 4% nanokaolin can result in a significant low chloride permeability of cement mortar among the seven dosages. The chloride diffusion coefficient of the mortar with the addition of 4% nanokaolin was decreased by 18.93%, 12.68% and 31.05% at 7, 14 and 28 curing days, respectively.

Study on Properties and Application of PG/CS Composite PCMs

2014 ◽  
Vol 602-603 ◽  
pp. 624-627 ◽  
Author(s):  
Shi Chao Zhang ◽  
Guang Hai Wang ◽  
Wei Wu ◽  
Yu Feng Chen ◽  
Hao Ran Sun
Keyword(s):  
Phase Change ◽  
Phase Change Materials ◽  
Bending Strength ◽  
Thermal Protection ◽  
Absorption Capacity ◽  
Insulation Material ◽  
Short Time ◽  
Optimal Mechanical Property ◽  
Change Material ◽  
Insulation Performance

Tris (hydroxymethyl) ethane (PG) as a phase change material, micro-porous xonotlite (CS) as matrix, PG/CS composite PCMs were prepared by melt-soaking method, and the effect of micro-porous structure of xonotlite on heat absorption capacity, bending strength and insulation performance of composites, and the exudation of PG was studied. Otherwise, for the work environment and characteristics of propulsive device of vehicle, this paper explored the feasibility that phase change materials (PCMs) worked as the insulation material in short-time insulation system of the vehicle. Experimental results show that, when the most probable pore diameters of xonotlite was not less than 63nm, the composites presented better and almost same absorption capacities of matrix (CS) to PCM (PG) in different composites; when up to 85nm, the composite exhibited the lowest leakage rate (less than 5%), the optimal mechanical property and thermal insulation performance. This Study proposed a new idea for the design of the insulation material in the thermal protection system of propulsive device of vehicle.

Effect of furfuryl alcohol on the properties of hydrated cement mortar

2003 ◽  
Vol 18 (5) ◽  
pp. 1131-1140 ◽  
Author(s):  
V. K. Singh ◽  
R. K. Singh ◽  
S. D. Khatri
Keyword(s):  
Corrosion Resistance ◽  
Water Absorption ◽  
Open Porosity ◽  
Furfuryl Alcohol ◽  
Bending Strength ◽  
Cement Mortar ◽  
Setting Time ◽  
Heat Of Hydration ◽  
Indentation Method ◽  
Three Point Bending

The effect of furfuryl alcohol addition to ordinary cement on its properties, such as heat of hydration, setting time, compressive strength, and tensile strength was studied by adding 0.5–3.0% by weight of cement. Hardness was tested using the Vickers indentation method. Fracture toughness of cementitious bond and bending strength were determined using the three-point bending system. Corrosion resistance of resulting products was tested against 0.1 and 1.0 N HCI and H2SO4 and seawater, respectively. Water absorption/open porosity and microstructure were also determined. It was observed that strength, hardness, toughness, and corrosion resistance increase up to 3.0% addition of furfuryl alcohol in ordinary Portland cement. Polymeric phase was interspersed in cement, causing a decrease in water absorption/open porosity, and its interaction with hydrating cement caused additional bond formation, leading to the increase in strength.

Effect of Latex Rubber and Rubber Powder as an Admixture on Bending Strength of Cement Mortars

2019 ◽  
Vol 891 ◽  
pp. 180-186
Author(s):  
Santi Rattanaveeranon ◽  
Sarote Dumrongsil ◽  
Knavoot Jiamwattanapong
Keyword(s):  
Fly Ash ◽  
Sugarcane Bagasse ◽  
Bending Strength ◽  
Cement Mortar ◽  
Hydroxyl Group ◽  
Rubber Powder ◽  
Hybrid Compounds ◽  
Air Atmosphere ◽  
Cement Mortars ◽  
Latex Rubber

This paper reported the effect of latex rubber (LR) and rubber powder (RP) on the bending strength of cement mortars containing fly ash silica (FAS) prepared from sugarcane bagasse. The bending strengths of the cement mortars with the addition of LR and RP were compared. The study was conducted by adding 5-10 wt% of each admixture into cement mortar specimens and left in air atmosphere for 28 days before measuring their bending strength. At 5 wt.%, both LR or RP could significantly reinforce the bending strength of the mortar. The bending strength of cement mortars decreased when the proportion of the LR and RP were higher than 5 wt%. In addition, at 10 wt%, LR provided better bending strength than that of RP, i.e. the bending strength of mortar contained LR was 550 ksc, whereas that contained RP was 85 ksc. The bending strength of mortar with LP was much higher than that of the pure cement mortar (20 wt% FAS : 80 wt% cement) which was about 62 ksc. The low bending strength of the mortar with 10 wt% RP may be due to the decrease of Si-O-Si hybrid compounds which was inhibited by the hydroxyl group during the hydrolyzation process.

Application of Gas-Thermal Coatings on Low-Alloyed Steel Surfaces

2018 ◽  
Vol 284 ◽  
pp. 1284-1290 ◽  
Author(s):  
Alla A. Gerasimova ◽  
Sergey Gorbatyuk ◽  
V. Devyatiarova
Keyword(s):  
Diffusion Coefficient ◽  
Layer Thickness ◽  
Temperature Change ◽  
Scientific Work ◽  
Alloyed Steel ◽  
Effective Protection ◽  
Diffusion Layer Thickness ◽  
Steel Surfaces ◽  
Low Alloyed Steel ◽  
Thermal Coating

In the present scientific work a thickness calculation procedure of an aluminum gas-thermal coating, sprayed on the low-alloyed steel surfaces, in order to provide its effective protection at high temperatures, has been developed. The method is based on the calculations of the diffusion layer thickness with consideration the temperature change on the blank`s surface and on the dependence of the parameter (directly proportional to the diffusion coefficient) on the temperature over the range 700 to 1200 °C.

Innovative Lime-Pozzolana Renders for Reconstruction of Historical Buildings

2011 ◽  
Vol 324 ◽  
pp. 372-375 ◽  
Author(s):  
Eva Vejmelková ◽  
Petr Máca ◽  
Petr Konvalinka ◽  
Robert Černý
Keyword(s):  
Thermal Conductivity ◽  
Heat Capacity ◽  
Compressive Strength ◽  
Diffusion Coefficient ◽  
Bending Strength ◽  
Moisture Diffusivity ◽  
Historical Buildings ◽  
Matrix Density ◽  
Lime Plaster ◽  
Water Sorptivity

Bulk density, matrix density, open porosity, compressive strength, bending strength, water sorptivity, moisture diffusivity, water vapor diffusion coefficient, thermal conductivity, specific heat capacity and thermal diffusivity of two innovative renovation renders on limepozzolana basis are analyzed. The obtained results are compared with reference lime plaster and two commercial renovation renders, and conclusions on the applicability of the particular renders in practical reconstruction works are drawn.

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