NGHIÊN CỨU Dự ĐOÁN CƯỜNG Độ CHỊU NÉN CỦA BÊ TÔNG BỘT HOẠT TÍNH BẰNG CÁC PHƯƠNG PHÁP KHÔNG PHÁ HỦY

Abstract

This paper investigates the use o f non-destructive methods to estimate the compressive strength o f reactive powder concrete. The reactive powder concrete samples were produced from cement, silica fume, fly ash or ground granulated blast furnace slag, and fine sand.
The ultrasonic pulse velocity and bounching values o f concrete samples were determined using non-destructive methods, and their actual compressive strengths were determined using the compression test. Based on the relationship between ultrasonic pulse velocity, bounching values, and the real compressive strength, the table was built to estimate the compressive strength o f reactive powder concrete. The obtained results indicated that using the combination o f ultrasonic pulse velocity and bounching values brings about a higher level o f accuracy in predicting the compressive strength o f reactive powder concrete than using only ultrasonic pulse velocity or bounching values.
Keywords: Reactive powder concrete, compressive strength, ultrasonic pulse velocity, bouncing gun, non-destructive method.