低龄期柔模承载混凝土强度试验与增长规律研究-结构工程专业论文.docxVIP

Subject ： Young Period Flexible Formwork Concrete Carrying The Speciality ： Strength of Development Law Test and Research Structural Engineering Name ： Wan yan (Signature) Instructor ： Wang xiao li (Signature) ABSTRACT Flexible formwork supporting technology of pumping concrete in underground engineering is supporting new forms, mining without coal pillar roadway divided along goaf, driving roadway along goaf, cross mining and the mining without coal pillar roadway as well as in goaf roadway formed in four forms, of which the roadway along goaf pillar drift in economy and technology has many advantages, so the conditions suitable for the mines are preferred.The basic way of Retaining Roadways along goaf is when the upper section after the mining face, will face with a special transport roadway supporting material for maintenance, the retained roadway for working face under section return airway, such a tunnel can be two times using.Flexible mode of pumping concrete supporting technology in Roadway along goaf is widely used. Flexible formwork supporting technology of pumping concrete in the fiber flexible template having a permeable impermeable slurry characteristics, can be internal concrete in superfluous water discharge.In underground support, from the roof of the initial stress very early.In order to meet the technical design and construction technology requirements, the need for flexible mode of pumping concrete in early age performance study.In this paper, through the orthogonal experiment method gets a group of suitable for flexible formwork supporting technology of pumping concrete mix ratio test, and a flexible formwork concrete at different age of 8h, 12h, 1d, 3d, 5d, 7d, 14d, 28d compressive strength.Then the specimens to into the curing room maintenance, make its healing, for its conservation again 28 days after measuring the compressive strength.The research of the flexible mode of pumping concrete early strength and speed up the construction progre