高频振动搅拌配制C50机制砂混凝土性能

以贵州省某高速公路工程为背景,在工地试验室对高频振动配制机制砂C50混凝土进行试验研究.选取主要原材料并进行性能指标检测及优选,确定C50机制砂混凝土最佳配合比;对不同搅拌方式配制的C50机制砂混凝土的抗压强度与耐久性进行试验对比;使用工业CT扫描来观察不同搅拌方式配制的C50机制砂混凝土内部微观结构.试验结果表明:采用特殊的高频振动机理来配制机制砂高标号混凝土,并与普通自落式配制的机制砂混凝土试件对比,发现高频振动配制出的混凝土各项性能指标高于普通搅拌配制的混凝土,其混凝土抗压强度与耐久性得到改善.采用高频振动搅拌制备的机制砂混凝土其内部结构更加密实均匀,整体性较好.

Study on performance of C50 mechanism sand concrete by high frequency vibration stirring

Based on the background of an expressway project in Guizhou province, an experimental investigation on mechanical sand C50 concrete prepared by high frequency vibration was carried out in the construction site laboratory. The main raw materials are selected in test and their performances are tested and optimized to determine the best mixing ratio of the C50 machine-made sand concrete. The compressive strength and durability of the C50 machine-made sand concretes prepared by different stirring methods are tested and compared with each other. The compressive strength and durability of C50 sand concretes prepared by different stirring methods were tested and compared further, and internal microstructures of C50 sand concretes prepared by different stirring methods were observed one by one by industrial CT scanning. Tested results indicate that the high-grade concrete of machine-made sand may be prepared by using the special high-frequency vibration mechanism. Compared with the ordinary self-falling machine-made sand concrete, it is found that the performance of the concrete prepared by high-frequency vibration is higher than that of the concrete prepared by ordinary stirring. The compressive strength and durability of the concrete are improved therefore. The internal structure of the machine-made sand concrete prepared by high-frequency vibration stirring becomes more compact and uniform, and the integrity of the concrete is better as a result.