Method for evaluating the flame-retardant effect of nano-magensium-aluminum hydrotalcite on bituminous mixture

Abstract

The invention provides a method for evaluating the flame-retardant effect of nano-magensium-aluminum hydrotalcite on bituminous mixture, belongs to the technical field of bituminous mixture, and aimsto solve the problems that a current bituminous mixture flame-retardant effect evaluating method is difficult to simulate the asphalt pavement fire condition, has few testing combustion parameters, cannot comprehensively and accurately evaluate the flame-retardant effect of a flame retardant on the bituminous mixture, and has large addition amount for conventional flame retardant to impact the mixture pavement performance. The method comprises the following steps: preparing flame-retardant modified asphalt, and respectively preparing rutting plate test-pieces; cutting into conical calorimetertest-pieces, and keeping upper surfaces of original rutting plates; coating bottoms and side faces of the test-pieces with aluminum foils, keeping upper surfaces of original rutting plates upward to serve as heat faces, and simulating the pavement heated condition in a fire disaster to set a corresponding thermal radiation strength; and finally analyzing the test result to disclose influence of flame retardant on mixture combustion characteristics. According to the method, the flame retardant effect of a flame retardant on the bituminous mixture can be comprehensively and objectively evaluated, and accordance is provided to researching and developing flame retardants and improving the fire safety of asphalt pavement.

Description

technical field [0001] The invention relates to a method for evaluating the flame-retardant effect of nano-magnesium-aluminum hydrotalcite on asphalt mixture, and belongs to the technical field of asphalt mixture. Background technique [0002] Bitumen is a rheological and impermeable viscoelastic liquid and semisolid. It has been widely used in road paving, roof waterproofing and composite materials, etc. However, bituminous materials are flammable above 300°C. The heat and toxic gases generated during a tunnel fire will promote the spread of the fire, and the temperature inside the tunnel can quickly rise to 1000°C, seriously endangering the lives and property of people in the fire environment. Therefore, it is of great practical significance to study the flammability of asphalt materials. [0003] As the basis of building materials, asphalt is widely used in tunnel roads, underground garages, gas stations, construction and waterproofing materials, among which asphalt co...

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Problems solved by technology

[0011] The purpose of the present invention is to provide a method for evaluating the flame-retardant effect of asphalt mixture by nano-magnesium-aluminum hydrotalcite, so as to solve the problem that the current evaluation method for the flame-retardant effect of asphalt mixture is difficult to simulate the fire conditions of asphalt pavement, and the test combustion parameters are less and cannot be more comprehensive. , Accurately evaluate the flame retardant effect of magnesium aluminum hydrotalcite on asphalt mixture, and the addition of commonly used flame retardants is large, which affects the road performance of asphalt mixture, so as to provide technical support for the development of more efficient magnesium aluminum hydrotalcite flame retardants

[0013] In view of the fact that the current evaluation method for the flame retardant effect of asphalt mixture is difficult to simulate the fire conditions of asphalt pavement, the test combustion parameters are few, and it cannot be more comprehensive and accurate to evaluate the flame retardant effect of magnesium aluminum hydrotalcite on asphalt mixture, and the amount of commonly used flame retardants Large, affecting the road performance of asphalt mixture, the present invention provides a method for evaluating the flame-retardant effect of nano-magnesium-aluminum hydrotalcite on asphalt mixture

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