Asphalt concrete type asphalt concrete how to make
2020-06-19 13:14:15
The strength of asphalt mixture is mainly manifested in two aspects. One is the binding force of the binder formed by the asphalt and the mineral powder; the other is the internal friction resistance and the locking force between the aggregate particles. The large surface area of ​​fine ore fines (mostly less than 0.075 mm) makes the bituminous material form a film, thereby increasing the bond strength and temperature stability of the bituminous material; and the locking force is mainly generated between the coarse aggregate particles. What kind of asphalt concrete is there? How to build it?
[Asphalt concrete type introduction]
According to different binders used, asphalt concrete can be divided into two categories: petroleum asphalt and coal asphalt; in some countries or regions, natural asphalt is used or mixed.
According to the different types of aggregates used, it can be divided into gravel, gravel, sand, and slag, and is most commonly used as gravel. According to the maximum particle size of the mixture, it can be divided into coarse grain (35-40mm), medium grain (20-25mm), fine grain (10-15mm), sand grain (5-7mm), etc. Several types.
According to the degree of compaction of the mixture, it can be divided into several categories such as dense gradation, semi-open gradation and open gradation. The open gradation mixture is also called asphalt crushed stone. Among them, the dense-mixed gravel mix of hot mix and warm shop is durable, with high strength and good integrity. It is a representative material for building high-grade asphalt pavement, and it is most widely used.
Different countries have different specifications for bituminous concrete. In China, the technical specifications for hot-mixed hot paving asphalt mixtures are defined as asphalt concrete with a voidage of 10% or less, and they are subdivided into type I and type II. The rate is 3 (or 2) ~ 6%, is a close-fitting type; II type is 6 ~ 10%, is a half open grade type; void rate of more than 10% is called asphalt gravel, an open grade matching; Material physical and mechanical indicators of stability, flow values ​​and porosity and so on.
[How to make asphalt concrete]
Hot mix asphalt should be mechanically mixed in a centralized location. Generally used fixed-type hot-mix plant, in the longer line should use mobile hot mix. Cold mix asphalt mix can be concentrated, but also on the road mix. The main equipments of the asphalt mixing plant include: asphalt heating pots, sand storages, ore bins, heating drums, mixers and weighing equipment, steam boilers, asphalt pumps and pipelines, dust removal facilities, etc. Some have thermal aggregates. Re-sort and store equipment (see asphalt mix base). Mixer can be divided into continuous and batch type two categories. In the preparation process, in the past, the sandstone was first dried and heated, and then mixed with hot asphalt and cold mineral powder. Another method was developed to mix wet aggregates with hot asphalt first, and then heat and mix to eliminate fly ash caused by aggregates during heating and drying. When the latter process is used, it is desirable to prevent the residual moisture in the mixture from affecting the service life of the asphalt concrete, and it is better to use the asphalt anti-stripping agent at the same time to enhance the water resistance.
Summary: The above is the relevant knowledge of asphalt concrete collected by Xiao Bian. We hope to help everyone! I believe that after reading the above article, we have a certain understanding of asphalt concrete! If you want to learn more about this knowledge, please pay attention to this site information platform! Here are more things you want to know!
[Asphalt concrete type introduction]
According to different binders used, asphalt concrete can be divided into two categories: petroleum asphalt and coal asphalt; in some countries or regions, natural asphalt is used or mixed.
According to the different types of aggregates used, it can be divided into gravel, gravel, sand, and slag, and is most commonly used as gravel. According to the maximum particle size of the mixture, it can be divided into coarse grain (35-40mm), medium grain (20-25mm), fine grain (10-15mm), sand grain (5-7mm), etc. Several types.
According to the degree of compaction of the mixture, it can be divided into several categories such as dense gradation, semi-open gradation and open gradation. The open gradation mixture is also called asphalt crushed stone. Among them, the dense-mixed gravel mix of hot mix and warm shop is durable, with high strength and good integrity. It is a representative material for building high-grade asphalt pavement, and it is most widely used.
Different countries have different specifications for bituminous concrete. In China, the technical specifications for hot-mixed hot paving asphalt mixtures are defined as asphalt concrete with a voidage of 10% or less, and they are subdivided into type I and type II. The rate is 3 (or 2) ~ 6%, is a close-fitting type; II type is 6 ~ 10%, is a half open grade type; void rate of more than 10% is called asphalt gravel, an open grade matching; Material physical and mechanical indicators of stability, flow values ​​and porosity and so on.
[How to make asphalt concrete]
Hot mix asphalt should be mechanically mixed in a centralized location. Generally used fixed-type hot-mix plant, in the longer line should use mobile hot mix. Cold mix asphalt mix can be concentrated, but also on the road mix. The main equipments of the asphalt mixing plant include: asphalt heating pots, sand storages, ore bins, heating drums, mixers and weighing equipment, steam boilers, asphalt pumps and pipelines, dust removal facilities, etc. Some have thermal aggregates. Re-sort and store equipment (see asphalt mix base). Mixer can be divided into continuous and batch type two categories. In the preparation process, in the past, the sandstone was first dried and heated, and then mixed with hot asphalt and cold mineral powder. Another method was developed to mix wet aggregates with hot asphalt first, and then heat and mix to eliminate fly ash caused by aggregates during heating and drying. When the latter process is used, it is desirable to prevent the residual moisture in the mixture from affecting the service life of the asphalt concrete, and it is better to use the asphalt anti-stripping agent at the same time to enhance the water resistance.
Summary: The above is the relevant knowledge of asphalt concrete collected by Xiao Bian. We hope to help everyone! I believe that after reading the above article, we have a certain understanding of asphalt concrete! If you want to learn more about this knowledge, please pay attention to this site information platform! Here are more things you want to know!
Concrete stairs how to avoid renovation contract trap indoor production tutorial
Sodium Dihydrogen Phosphate,Disodium Hydrogen Phosphate,Soda Powder,Sodium Silicate Analysis Reagent
Shaanxi United Xingchuang International Co., Ltd. , https://www.lxcgj.com