Through the experiment, this paper studies and analyzes influence of different initial temperatures on cement grout performance. The results show initial temperature has influences on grout fluidity, bleeding rate, setting time and early strength. Under guaranteed curing temperature, initial temperature has no influence on long-term strength of grout.
Revitalizing regional economy is one of the economic development basic strategies in our country. Finance-taxation policies, as the main macroeconomic control legal means under the conditions of market economy, play a positive and key role in revitalizing regional economy, including the development process of special economic zones, southeast coastal open, developing western regions and revitalizing northeast old industrial base etc. Taking the preferential tax to the eastern coastal areas in regional economic development, financial system of weakening the Midwest financial capability, the limited role of equalization in financial transfer payment, and tax system of widening gap in development between regions into account, the author considered that some finance-taxation policies should be carried out, such as renovating the prevailing financial system, carrying out comprehensive finance-taxation policies, normalizing transfer payment system, and strengthening preferential tax policy.
The large rigid foundation has a high requirement on subgrade consolidation deformation, especially the soft soil subgrade, of which the design and construction is very difficult. Through the analysis on subgrade treatment process of a sewage treatment plant in Zhejiang Province, this paper introduces the mathematical calculation model and the specific calculation method for treating the soft soil subgrade with the vacuum preloading method. The calculation results obtained has basically reflected the actual deformation process of the subgrade; it is a rational referential calculation method to guide the design and construction.
Polymers and their composites are extensively used in commercial applications[.Wearing is one of the forms which makes materials damage and failure, especially the materials by friction, impact, erosion like rocks, minerals etc, the wear caused huge losses. Therefore, high-strength wear-resistant engineering machinery rational use of materials is very important. So chose a method that simple, rapid, low cost, good effect to prevent and repair the parts wear is necessary. In recent years, there has been much interest in particle-reinforced polymers not only because to produce this kind of polymer is cheaper, but also they can be used as high quality engineering materials[2]. In abrasive wear, the low stress also occupied a certain proportion of erosion[. Current polymeric coatings, although corrosion resistant, do not satisfactorily resist wear, but these studies provided many ways to improve the erosion resistance of particle-reinforced polymers[410].
Abstract. The regularity of radon exhalation rate in the over-broken granite tunnel is susceptible to weather conditions and ventilation styles. Based on the calculation model of radon exhalation in tunnel, some experiments have been carried out to analyze the variations of radon exhalation in cases of natural ventilation, blowing ventilation and exhaust ventilation separately. The results show that there is a linear relation between the radon exhalation and the natural ventilation quantity, and also between the radon exhalation and the ambient temperature; the radon exhalation in the case of exhaust ventilation is 63% higher than that in the blowing case under the condition of the same ventilation quantity and ambient temperature. Therefore, it is suggested that operation in the tunnel in high temperature be avoided in summer, and the blowing ventilation be adopted as an effective way for ventilation.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
customersupport@researchsolutions.com
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.