ABSTRACT
The hydrophilic and porous structure of cement-based concrete materials makes it vulnerable to various harmful ions dissolved in water in the environment or during the freeze-thaw cycle, resulting in a significant decline in durability. Therefore, the introduction of hydrophobic hydroxyl silicone oil with good chemical stability and excellent hydrophobic properties during the process of concrete preparation to achieve the hydrophobic modification of its internal holes has very positive significance in terms of improving its durability. In order to disperse the hydrophobic hydroxyl silicone oil evenly in the internal pores of the concrete, synthetic non-ionic polyether-modified silicone oil was used as an emulsifier to make it a water-soluble emulsion. The influences of the composition of the emulsifier on the dispersion, water contact angle, water absorption, porosity, and compressive strength of cement mortar were investigated. The results show that when the emulsion content is 0.5%, the pore volume of the cement mortar decreases by 15%, and the maximum contact angle reaches 128°, which is conducive to improving the anti-erosion and anti-freezing properties of concrete and provides a new solution for the preparation of high-durability concrete. However, the introduction of polyether-modified silicone oil increases the number of large holes in the cement mortar, and leads to an increase in water absorption and a decrease in compressive strength. It is necessary to further optimize the composition of emulsifier in future work.
ABSTRACT
Hypertension is considered as an important public health problem in developed and developing countries. The disease is closely associated with health-promoting lifestyle (HPL), and it seems that HPL plays an important role in improving health-related quality of life (HRQOL). This cross-sectional study is to investigate the effects of health-promoting lifestyle (HPL) on health-related quality of life in elderly people with hypertension from a community health service center in Hengyang, Hunan, PR China.Totally 530 elderly patients with hypertension from the community health service center were included in this study, who were asked to fill in a questionnaire (504 patients responded). HPL was assessed by the health-promoting lifestyle profile II (HPLP-II), and HRQOL was measured by the Short Form Health Survey Questionnaire (SF-36).HPL among these elderly people with hypertension was at moderate level (125.02â±â21), with the highest score for nutrition and the lowest score for health responsibility. Moreover, HRQOL among these elderly hypertensive people was at moderate level (54.36â±â21.18). Role-emotional domain score was far below average, vitality domain was a little below average, social functioning and general health domains were a little above average, and other domains were far above average. Furthermore, HPL and HRQOL were positively correlated (Pâ<â.01). According to the standardized regression coefficients, the influencing factors for HRQOL included (in a descending order) the health responsibility, physical activity, interpersonal relationships, stress management, spiritual growth, and nutrition.HPL and HRQOL were both relatively poor in the elderly people with hypertension from the community health service center. HPL represents an important factor affecting HRQOL of elderly people with hypertension. HRQOL could be improved through promoting HPL (such as health responsibility and physical activity).
