Marine ultra-high performance concrete and preparation method thereof

Abstract

The invention provides marine ultra-high performance concrete and a preparation method thereof. The marine ultra-high performance concrete comprises the following raw materials in parts by weight: 450to 650 parts of cement, 50 to 200 parts of silica fume, 5 to 50 parts of nano silicon dioxide, 100 to 200 parts of mineral powder, 100 to 200 parts of fly ash, 1000 to 1300 parts of sand, 35 to 200 parts of steel fibers, 0.5 to 3.0 parts of polypropylene fibers, 1 to 10 parts of a hydration heat inhibitor, 20 to 45 parts of an additive and 180 to 220 parts of water. Compared with the prior art, the marine ultra-high performance concrete has good flowing property, good fluidity retaining capacity, and relatively low slump loss. In addition, the marine ultra-high performance concrete has low early hydration heat and good anti-cracking performance, and also has excellent mechanical properties and relatively high compressive strength. Moreover, the marine ultra-high performance concrete is high in compactness, has excellent chloride ion penetration resistance, has good durability in a marine environment, and thus has a wide market prospect.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a marine ultra-high performance concrete and a preparation method thereof. Background technique [0002] Ultra-high performance concrete, referred to as UHPC (Ultra-High Performance Concrete), as a new type of cement-based structural material, has excellent properties such as ultra-high strength, high durability, and high toughness. Ultra-high performance concrete has achieved a great leap forward in engineering materials, and it is also the most innovative cement-based engineering material in the past three decades. However, due to the use of a large amount of cementitious materials in the ultra-high-performance concrete currently developed, the early hydration heat is high, and the internal temperature rise of the concrete is too fast, which can easily lead to the formation of cracks, which seriously affects the durability of the concrete under the acid-base erosio...

AI Technical Summary

Problems solved by technology

However, due to the use of a large amount of cementitious materials in the ultra-high-performance concrete currently developed, the early hydration heat is high, and the internal temperature rise of the concrete is too fast, which can easily lead to the formation of cracks, which seriously affects the durability of the concrete under the acid-base erosion of seawater. performance

However, the mechanical properties of ordinary marine concrete often cannot meet the engineering requirements.

[0003] The patent CN108609974A published on October 2, 2018 discloses a preparation method of ultra-high performanc

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