A kind of marine ultra-high performance concrete and preparation method thereof

Abstract

The invention provides a marine ultra-high performance concrete and a preparation method thereof, comprising the following raw materials in parts by weight: 450-650 parts of cement, 50-200 parts of silica fume, 5-50 parts of nano-silica, and 100-200 parts of mineral powder 100-200 parts of fly ash, 1000-1300 parts of sand, 35-200 parts of steel fiber, 0.5-3.0 parts of polypropylene fiber, 1-10 parts of hydration heat inhibitor, 20-45 parts of admixture and 180 parts of water ‑220 copies. Compared with the prior art, it has good fluidity and fluidity retention ability, and lower slump loss. Moreover, it has low early hydration heat and good crack resistance; it also has excellent mechanical properties and high compressive strength. In addition, the ultra-high-performance marine concrete of the present invention has high compactness, excellent resistance to chloride ion penetration, and good durability in marine environments, so it has broad market prospects.

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 performance concrete and prefabricated PC. In this method, a large amount of sulphoaluminate rapid hardening cement is used, and the early hydration heat is very high, so large-volume pouring When the temperature stress is very easy to lead to the formation of cracks

[0004] The patent CN104003682A published on August 27, 2014 discloses a preparation method of ultra-high performance concrete, which uses a mixed cementitious material composed of rapid hardening cement, ground cement, and ordinary Portland cement to prepare ultra-high performance concrete. High heat of transformation, not suitable for mass pouring

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