Overview on Study on Properties of Concrete Canvas

Since there is expeditious increase in the materials extensively used in construction, there is a great demand for construction materials in the current generation to follow different conventional methods. There is no provision for very quick and workable concrete installation procedures in the event of an emergency. Concrete as a construction material is well-known around the world, but the hunt to improve its flexibility has always piqued researchers' interest. Although concrete has many advantages, one disadvantage is that it is not flexible when hardened. The rising cost of repair work as a result of weathering, ground surface damage, and seepage in water canals has always been a source of concern. Concrete cloth, a new technology that removes faults from concrete and is flexible and simple to apply, has been invented. Concrete Canvas has a ceramic property which is semi rigid that makes it fire resistant and water proof.

Effect of Low Temperature Sintering on the Porosity and Microstructure of Porous Zeolite Ceramic

Manufacturing a porous ceramic specimen from natural zeolite materials mined in Malang, Indonesia was conducted by using a low temperature sintering. In this study, a porous ceramic property with rectangular shaped and prism shaped fillets at each end were sintered at 800-900°C and finally were investigated. Density and porosity measurements were performed using Archimedes method. The microstructure photos were used to measure the neck diameter and the contact angle between the two grains particles and two-dimensional porosity. The result of the zeolite ceramic measurement shows that the higher the sintering temperature the higher the density value and the smaller the open porosity. While from the microstructure photo it is shown that the neck diameter was larger the contact angle was wider. This phenomenon was happened because of the flux diffusion on the grain boundaries. This diffusion flow condition would influence the specimen surface, volume and grain boundary so that the porous ceramic density increases.

Study on the Reliability Improvement of a Mechanical Seal for the Primary Loop Recirculation Pumps (PLR Pump)

Primary Loop Recirculation pump (PLR pump) for Boiling Water Reactor (BWR) uses a mechanical seal as a shaft seal device, which the seal material is made of a ceramic. Recently, a new ceramic suitable as a seal material has been developed. We will explain about the introduction of the material to a mechanical seal for the PLR pump. First, we checked the material characteristics of the ceramic. Next, we carried out the abrasion acceleration test at the mechanical seal test facility for PLR pump, and performed an analysis of seal face deformation for the applied ceramic. Then, we performed a full scale test that simulated the operation pattern of the PLR pump. As a result, we confirmed that the new ceramic property suits for the use as a mechanical seal for the PLR pump.

Anti-Counterfeiting Jingdezhen Ceramic Decal Manufacturing Technique Based on Digital Watermarking Method

The traditional digital watermarking, as a copyright protection technique, has been widely applied for the multimedia information, such as text, picture, video, etc. In this paper, a new scheme is planned to embed watermark into the porcelain decal for describing the property declaration of Jingdezhen ceramics. Since the images on Jingdezhen ceramic are manually created, it cannot be regularly modulated by the watermark during the watermark embedding process. Therefore, the digital watermarking technique cannot be directly applied to the ceramics. This paper presents a specially designed digital watermarking system for the protection of the ceramic property. The results from the experiment show that our proposed algorithm achieves the purpose.

Nonlinear Behavior and Critical State of a Penny-Shaped Dielectric Crack in a Piezoelectric Solid

By means of the Hankel transform and dual-integral equations, the nonlinear response of a penny-shaped dielectric crack with a permittivity κ0 in a transversely isotropic piezoelectric ceramic is solved under the applied tensile stress σzA and electric displacement DzA. The solution is given through the universal relation, Dc∕σzA=KD∕KI=MD∕Mσ, regardless of the electric boundary conditions of the crack, where Dc is the effective electric displacement of the crack medium, and KD and KI are the electric displacement and the stress intensity factors, respectively. The proportional constant MD∕Mσ has been derived and found to have the characteristics: (i) for an impermeable crack it is equal to DzA∕σzA; (ii) for a permeable one it is only a function of the ceramic property; and (iii) for a dielectric crack with a finite κ0 it depends on the ceramic property, the κ0 itself, and the applied σzA and DzA. The latter dependence makes the response of the dielectric crack nonlinear. This nonlinear response is found to be further controlled by a critical state (σc,DzA), through which all the Dc versus σzA curves must pass, regardless of the value of κ0. When σzA<σc, the response of an impermeable crack serves as an upper bound, whereas that of the permeable one serves as the lower bound, and when σzA>σc the situation is exactly reversed. The response of a dielectric crack with any κ0 always lies within these bounds. Under a negative DzA, our solutions further reveal the existence of a critical κ*, given by κ*=−RDzA, and a critical D*, given by D*=−κ0∕R (R depends only on the ceramic property), such that when κ0>κ* or when ∣DzA∣<∣D*∣, the effective Dc will still remain positive in spite of the negative DzA.