High-performance concrete capable of resisting high-temperature cracking

Abstract

The invention relates to a high-performance concrete capable of resisting high-temperature cracking. The concrete comprises the following components according to a content: 300-600 kg / m<3> of cement, 100-200 kg / m<3> of limestone powder, 1-2 kg / m<3> of polypropylene fiber, 150-200 kg / m<3> of water, 700-1200 kg / m<3> of limestone coarse aggregate, and high-efficiency polycarboxylic acid water reducing agent the amount of which is 1.0-1.4% that of cement, wherein the sand ratio is 40-50%. The concrete does not crack at high temperature or in fire, thereby solving the problems of poor cracking resistance of common, high-strength or high-performance concrete; the excellent working performance of the concrete provides convenience for construction; and good durability of the concrete improves service performance and safety stock of a structure, thus certain safety guarantee is provided for rescue working in fire and after fire, and the concrete has obvious economic benefits and social benefits.

Description

technical field [0001] The invention belongs to the technical field of building materials in civil engineering, in particular to a high-performance concrete. Background technique [0002] The high temperature of the fire will not only cause the deterioration of the mechanical properties of the tunnel lining structure, but also cause huge damage to the tunnel lining concrete, such as bursting, spalling, etc., which will directly lead to the reduction or even failure of the safety performance of the structure, resulting in huge losses of life and property . [0003] Burst is the main form of fire damage to the tunnel lining structure. Burst generally occurs 20 minutes after the fire. At the same time, affected by the heating rate and the characteristics of the concrete itself, the temperature of the burst is roughly between 250°C and 420°C. Bursting is a common phenomenon, whether it is ordinary concrete or high-strength, high-performance concrete, it may occur, especially th...

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Problems solved by technology

[0005] The object of the present invention is to provide a kind of novel concrete that has excellent working performance and durability and does not burst under high temperature or fire, and solves the problem of poor burst resistance of ordinary, high-strength or high-performance concrete. Its excellent working performance is The construction provides convenience, and the good durability improves the service performance of the structure, improves the safety reserve of the structure, and provides a certain safety guarantee for the rescue work during and after the fire

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