การต้านทานแรงกระแทกของพื้นคอนกรีตเสริมเส้นใย สังเคราะห์ที่ใช้กรวดแม่น้ำเป็นมวลรวมหยาบโดยการ ทดสอบปล่อยตกตุ้มน้ำหนัก

Abstract

This research aims to study the behavior of synthetic fiber reinforced concrete using river gravel as coarse aggregate under impact. This research is divided into 2 parts. Part 1 studies the effects of using river gravel and 3 types of synthetic fibers, namely glass fiber, polypropylene fiber, and polyester fiber. Part 2 studied the impact behavior of concrete slabs with a carrier mixture, namely 25 MPa, 35 MPa, and 45 MPa design compressive strength. Three types of synthetic fibers were used as follows: Glass fibers, polypropylene fibers, and polyester fibers account for 0.5, 1.0, and 1.5 percent of the cement's weight, respectively. By releasing a weight of 15 kg at an initial height of 10 mm, the height is increased by 10 mm. Make an estimate of the number of times it dropped. Deflection value and energy absorption the results of the study concluded that, in Part 1, concrete using river gravel had lower mechanical properties than concrete using pebbles. When reinforced with fibers, river gravel concrete has better mechanical properties than stone-grit concrete. For synthetic fiber reinforced concrete, the sagging value of fresh concrete decreased with increasing fiber content. The compressive strength has slightly increased. Tensile strength and flexural strength were increased with fiber content, and in part 2, the impact strength was highest in river gravel concrete. contributes to the retention within the concrete where the sample is bent but still able to bear the force in the disaster to reduce the distribution of concrete parts. We discovered that polypropylene fibers at 1.0 percent are the best ingredient.