A comparison of flexural strengths of polymer (SBR and PVA) modified, roller compacted concrete
This brief article aims to reveal the flexural performance, including the equivalent flexural strength of PVA (Polyvinyl Alcohol) modified concrete by comparing it primarily with that of SBR (Styrene Butadiene Rubber) concrete. This data article is directly related to Karadelis and Lin [6].
Cracking analysis of induced joints in roller compacted concrete arch dam
Abstract Induced joint is seen as a kind of crack prevention measure for roller compacted concrete arch dam. Whether induced joints can crack firstly when the temperature drops of dam body to release temperature stress and control disordered cracks mainly depends on the equivalent strength, structural form and arrangement of joints. In this paper, the non-penetrating RCC induced joints are used to simulate the bilateralism interval induced joints in practical engineering. The functional relation between the equivalent strength of rectangular induced joints and elliptical induced joints with the change of weakening degree is established through the axial tension test. At the same time, the temperature stress of a certain RCC double curvature arch dam is simulated, and the cracking of induced joints and its effect on the stress of the dam are analyzed. The results show that under the temperature control measures of pouring temperature control and water cooling in the whole dam, the bilateralism interval induced joints with equivalent strength less than 1.409 MPa are set in the high tension stress zone of the dam body, which can effectively release the temperature stress and ensure the safety of the dam body under the temperature load.
Rational Design, Synthesis and Evaluation of γ-CD-Containing Cross-Linked Polyvinyl Alcohol Hydrogel as a Prednisone Delivery Platform
This study describes the in-silico rational design, synthesis and evaluation of cross-linked polyvinyl alcohol hydrogels containing γ-cyclodextrin (γ-CDHSAs) as platforms for the sustained release of prednisone (PDN). Through in-silico studies using semi-empirical quantum mechanical calculations, the effectiveness of 20 dicarboxylic acids to generate a specific cross-linked hydrogel capable of supporting different amounts of γ-cyclodextrin (γ-CD) was evaluated. According to the interaction energies calculated with the in-silico studies, the hydrogel made from PVA cross-linked with succinic acids (SA) was shown to be the best candidate for containing γ-CD. Later, molecular dynamics simulation studies were performed in order to evaluate the intermolecular interactions between PDN and three cross-linked hydrogel formulations with different proportions of γ-CD (2.44%, 4.76% and 9.1%). These three cross-linked hydrogels were synthesized and characterized. The loading and the subsequent release of PDN from the hydrogels were investigated. The in-silico and experimental results showed that the interaction between PDN and γ-CDHSA was mainly produced with the γ-CDs linked to the hydrogels. Thus, the unique structures and properties of γ-CDHSA demonstrated an interesting multiphasic profile that could be utilized as a promising drug carrier for controlled, sustained and localized release of PDN.