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Performance of Shotcrete for Infrastructure Rehabilitation in Cold Regions

Author: LiuChengCheng
Tutor: YuanXiZhong
School: Chang'an University
Course: Materials Science
Keywords: Cold Regions Reinforcement Water content Ultrasonic velocity Antifreeze durability Bubble spacing factor
CLC: U414
Type: Master's thesis
Year: 2011
Downloads: 28
Quote: 0
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Abstract


Cold area highway structures to withstand long-term cycle of freeze-thaw cycles of wet and dry , some structures but also by salt erosion structures surface spalling even drain tendon disease phenomenon seriously affect the normal use of the structures and long-term performance . Shotcrete technology the structures maintenance method is often used around sprayed concrete with less than the study design and its performance . This paper to evaluate the performance of the shotcrete through the grout setting time , mechanical properties , degree of hydration and antifreeze durability . Sprayed concrete setting and hardening in a short period of time , therefore , this paper first discusses doped admixtures and admixtures on the setting time of the cement slurry and construction admixture dosage recommendations based on test results . Secondly, we explore the cement mortar doped admixtures and admixtures of mechanical properties of the law of development , and to analyze the relationship between the cement mortar strength and ultrasonic velocity . Again , explore the accelerating agent , air entraining agent , slag powder and fly ash on the hydration process , respectively, using a vacuum oven , microwave , and time-domain reflectometer (TDR) changes in the water content in the cement hydration process tested with the contrast of the hydration process of mechanical strength , ultrasonic velocity . Finally , the use of on-site preparation of shotcrete specimen to verify the validity of the air-entraining agent to improve the shotcrete antifreeze durability , and explore the incorporation of different air-entraining agents sprayed concrete antifreeze durability , and thus start from the microscopic bubbles characteristic parameters - the average bubble diameter and bubble spacing factor to evaluate the durability of shotcrete antifreeze .

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