A C40 pumped concrete with a heat resistance of 500°C

Abstract

The invention relates to C40 pump concrete with the heat resisting temperature of 500 DEG C, and belongs to the field of building materials. Every cubic meter of the concrete is prepared from, by weight (kg / m<3>), 200-220 parts of cement, 80-100 parts of fly ash, 100-120 parts of slag micro-powder, 420-460 parts of natural fine sand with the fineness modulus of 1.8-2.0, 360-400 parts of andesite machine-made sand, 980-1000 parts of continuously-graded andesites gravel with the particle size of 5-20 mm, 4.00-4.80 parts of additives, 165-170 parts of mixing water and 0.9 part of polypropylene fibers. The C40 pump concrete with the heat resisting temperature of 500 DEG C meets the requirements for high strength, heat resistance and pumpability and also can meet the engineering requirements for large-scale production of the heat-resistant concrete.

Description

technical field [0001] The present invention relates to building materials, in particular to a high-strength, heat-resistant, pumpable and mass-producible concrete. Background technique [0002] Concrete is one of the most important civil engineering materials today. It is composed of cementitious materials, granular aggregates (also known as aggregates), water, and if necessary, admixtures and admixtures prepared in a certain proportion, uniformly stirred, densely formed, cured and hardened. artificial stone. Concrete has the characteristics of rich raw materials, low price and simple production process, so its consumption is increasing. At the same time, concrete also has the characteristics of high compressive strength, good durability, and a wide range of strength grades. These characteristics make it widely used, not only in various civil engineering, but also in shipbuilding, machinery industry, marine development, geothermal engineering, etc. Concrete is also an im...

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Problems solved by technology

In the prior art, to mix concrete with a heat resistance of 500°C, clay and high-alumina coarse and fine aggregates are usually used, but this type of aggregate has two major defects: 1. The output is small and the Stable and expensive, it is not suitable for large-scale commercial concrete production in mixing plants; 2. Due to the limitation of material and particle shape, the produced concrete cannot be pumped

When the heat resistance of ordinary concrete is less than 200°C, cracks will appear and the concrete strength and durability will drop sharply, which will affect the long-term operation of the project. Therefore, it is necessary to prepare concrete with a heat resistance of 500°C to pour the concrete structure channel for exhaust.

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