Study On The Impact Of Fiber On Physical Properties Of Pumice Lightweight Aggregate Concrete And Related Reinforcing Mechanism

With the development of national economy. Fiber Reinforced Concrete has become a new high-performance construction material gradually replacing Traditional concrete and gotten wide recognition in the civil and water conservancy construction engineering fields. Compared with Concrete prepared with gravels and pebbles as coarse aggregates. Concrete prepared with Natural pumice lightweight aggregate with coarse aggregates is characterized in light weight and high strength, so is widely used as a main construction material in project constructions. Light-weight Aggregate Concrete with Hybrid Fibers and Pumice Stones is made by mixing two or more types of fibers and putting them into Concrete using natural pumice stones as coarse aggregates instead of normal gravels and pebbles. Fiber is used to improve property indicators of Pumice lightweight aggregate concrete. Based on rich pumice stone reserves widely distributed in the Inner Mongolia area, this paper studies the basic mechanical properties, micro-mechanical properties and antifreeze property of Light-weight Aggregate Concrete with Hybrid Fibers and Pumice Stones by adding hooked end steel fibers and Durafibers into Pumice lightweight aggregate concrete matrix with the external addition method to prepare Light-weight Aggregate Concrete with Hybrid Fibers and Pumice Stones with the strength grade of LC30, in combination of the research results of comprehensive property improvement of Concrete by Fiber after Ordinary aggregate concrete is added with Hybrid fiber. The influence and mechanism of Fiber’s addition on improving the basic physical and chemical properties of Pumice lightweight aggregate concrete, including compressive strength, flexural toughness, splitting tensile strength, bending strength and freezing resistance, are analyzed and researched.This paper conducted experimental researches on the compressive strength, splitting tensile strength, bending strength and flexural toughness of concrete cubes separately under the conditions of Pumice lightweight aggregate concrete added with Deformed steel fiber or Dura fiber solely and additionally mixed with Hybrid fiber at different ratios. The improvement in basic mechanical properties of Pumice lightweight aggregate concrete after Fiber’s addition is analyzed. The entire process of a single hooked end steel fiber pulled out from the Pumice lightweight aggregate concrete matrix is experimented. The impact of hooked ends of the hooked end steel fiber on its pulling load from the concrete matrix is analyzed. Concrete’s freezing-thawing damage mechanism under the condition of coupling with frost and salt is discussed to find optimal adding amount of Hybrid fiber. The inside of concrete is scanned and photographed with a SEM electron microscope, and the improvement role and mechanism of Fiber to Concrete’s mechanical properties and antifreeze property is explained from the perspective of micromechanics. Through experimental researches, the results are comparatively ideal, providing a reliable basis for future Light-weight Aggregate Concrete with Hybrid Fibers and Pumice Stones researches and actual engineering applications.