A kind of spiral steel fiber ultra-high performance concrete and its preparation method

Abstract

The invention provides a spiral steel fiber ultra-high-performance concrete and a preparation method thereof. The concrete material is composed of cement, fine sand, water, quartz powder, high-efficiency water reducing agent and steel fibers, in addition, inorganic mineral admixtures such as fly ash, slag and the like can be selectively added to replace partial cement; and the adopted steel fiberscomprise a linear steel fiber and a spiral steel fiber. The concrete is prepared from, by mass, 1000-1300 parts of the cement, 100-300 parts of silica fume, 900-1200 parts of the fine sand, 100-300 parts of the quartz powder, 30-60 parts of the water reducing agent, 150-400 parts of the water and 50-300 parts of the steel fibers. The obtained spiral steel fiber concrete material has the advantages that compared with the adhesive property between the linear steel fiber and a concrete substrate, the adhesive property between the spiral steel fiber and the concrete substrate can be obviously improved, and the tensile strength of the spiral steel fiber ultra-high-performance concrete is higher than that of conventional steel fiber concrete; since the spiral steel fiber has an 'unspinning' process when being pulled out from the substrate, the deformation ability of the conventional steel fiber concrete can be greatly improved.

Description

technical field [0001] The invention relates to the field of building materials, and belongs to a new type of building material, in particular to a spiral steel fiber ultra-high performance concrete and a preparation method thereof. Background technique [0002] Traditional steel fiber reinforced concrete is a multi-phase, multi-component cement matrix composite material formed by adding an appropriate amount of random distributed short steel fibers into ordinary concrete. Compared with ordinary concrete materials, steel fiber reinforced concrete overcomes many disadvantages such as low strength and easy cracking. Ultra-high performance concrete (UHPC) has high density because it does not contain coarse aggregate, resulting in ultra-high compressive performance and durability, and its compressive strength is generally 150-200 Mpa. Compared with its ultra-high compressive strength, its tensile strength is still low, and it is more prone to brittle fracture. After adding shor...

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Problems solved by technology

However, in the process of pulling out the spiral steel fiber from the ordinary concrete mortar, due to the high interface bonding force and the low matrix strength, it is easy to directly cause the damage of the matrix, so it is difficult to give full play to the role of the spiral steel fiber

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