Preparation method of ultra-high-strength steel fiber reinforced concrete for super-high pumping

Abstract

The invention provides a preparation method of ultra-high-strength steel fiber reinforced concrete for super-high pumping. According to the method, the ultra-high-strength steel fiber reinforced concrete with the strength grade of C150 is prepared by changing proportion of a cementing material and a feeding sequence and can be prepared with conventional production process through a mixing plant, and the problem that concrete with the strength grade of C150 or higher cannot be produced with the conventional process is solved. Common Portland cement as well as coarse and fine aggregate is adopted, and the cement is prepared through technological approaches such as reduction of a water-binder ratio, density enhancement and the like under double-doping actions of a polycarboxylate superplasticizer and a superfine mineral admixture. The prepared concrete has good working performance, the slump flow is 670-700 mm, and loss is basically avoided within 2 h; the viscosity is low, and rewinding time is 3.2-4.2 s; 28 d compressive strength reaches the strength grade of C150, and requirements for pumping construction of super high-rise buildings with height of 600 m or higher can be met.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a preparation method of ultra-high pumping ultra-ultra-high-strength steel fiber concrete. Background technique [0002] The main purpose of increasing the strength of concrete is to continuously meet the ever-increasing requirements for the bearing capacity of concrete materials in engineering structures, especially the growing contradiction between global population expansion and land resources in modern society, making super high-rise and super long-span structures a modern The main development direction of structural engineering, the research and application of high-performance concrete and other new high-performance cement-based materials are becoming more and more extensive. The requirement for ultra-high-strength concrete is that the compressive strength of concrete should reach more than 150MPa. At present, the materials for preparing ultra-high-strength concre...

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Problems solved by technology

The average strength of the above-mentioned concrete has reached 120MPa, but the strength has not reached the C120 strength level; "A C120 Ultra-High-Strength Concrete Easy to Pump in Super-high-rises" (CN104045280A), the patent proposes a super-high-rise pump that is easy to pump based on the theory of mineral water reduction C120 ultra-high-strength concrete, which is prepared by conventional methods, has low viscosity, is easy to pump at a height of more than 400m, and has a strength grade of C120, but the patent does not involve research on the strength grade of C150; "Aggregate to 140MPa Strength Research on the Influence of Graded Concrete Performance", the paper studies the influence of aggregate type, gradation, maximum particle size, particle shape and sand ratio on the working performance and compressive strength of ultra-high-strength concrete

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