The Mechanical Properties Of Alkali-resistant Glass-fiber-reinforced Dry Concrete

In recent years, new type wall materials with deepen reform, the application of agglutination loam brick is limited, this make the new type of wall materials has been widely used in civil engineering. Concrete small-size hollow block is a typical new wall material; the development of reinforced concrete block masonry structure is increasingly progressing. And in Heilongjiang Province, it has become an accepted form of construction; the project has also been widely used. How to use a new method to improve the mechanical properties of small concrete hollow block such as compressive strength, flexural strength, to improve the cracking load, enhanced binding effect while the stem is being pressed, and to improve the mechanical properties of the end edge of the structural, it has important value in engineering.Concrete small-size hollow block is composed of dry concrete material, and go through extrusion process by block making machine. To provide the basic study of alkali-resistant glass fiber reinforced concrete block, this paper is about to explore the mechanical properties of the alkali-resistant glass fiber reinforced dry concrete, and mainly complete two batches of the test:(1) The first batch of tests, make 150 mm cube compression test, by mixing different content of alkali-resistant glass fibers(AR fiber) and with different mix proportion of concrete. Then measure the effect of AR fiber on compressive strength and stress- strain curves of the cube concrete. Experimental results show that the addition of AR fiber to concrete doesn’t obviously make compressive strength and stress- strain get improve.(2) The second batch of tests, using the first batch of experimental results and analysis, and make some changes in the experiments. Make 14 days- age 150 mm cube concrete specimens and prism concrete specimens. Use different content of glass fiber and different glass fiber type to the tests to measure the effect of glass fiber on the mechanical properties of concrete and at the same time obtain its stress- strain curve and obtain the best fiber type which has the most effect on dispersion and the best volume rate of fiber in the concrete. The results show that 1% of the ARD fiber in concrete has more evenly distributed, and more obvious effect on the concrete. The next test is to make 28 days-age specimens, through the use of 1% ARD fibers mixed into ordinary concrete and dry concrete, the test results show that the mechanical properties of these two kinds of concrete are all improved. ARD fiber make splitting tensile strength increase, the deform ability of concrete has been improved either. The difference is that fiber can improve the ductility of ordinary concrete more obvious than dry concrete.This article is to study the effects on mechanical properties of different fiber content for ordinary concrete and dry hard concrete, and compare it to plain concrete. After these two batches of experiments and found that fiber can improve the dry concrete splitting tensile strength, although compressive strength reduced, but it also makes it more tension and compression ratio obviously increase. Moreover with this ratio increases, its brittleness improve better. In this case, the fiber can improve the deformation capacity of dry concrete, and that will improve the seismic performance of masonry structures.