1+2: B The current roof insulation material is mostly platy perlite insulation block. The practice is to find the slope with cement perlite (or vermiculite) loose material, and the perlite insulation block is paved on it. Since the material of the slope layer and the insulation plate is low in strength and thick, it is necessary to make a thick cement mortar leveling layer or concrete cushion layer on the insulation block before the construction of the waterproof layer, and generally arrange the wire in the leveling layer or the cushion layer. (Rebar) mesh to prevent damage to the roof when it encounters a local large load (equipment transportation, personnel activities, etc.), affecting the quality of the waterproof layer. With the development of eco-friendly building requirements in the room, the wall insulation has been widely promoted and used, and the floor insulation is gradually reduced by the tendency to reduce hydration heat and reduce concrete shrinkage and cracking.

The addition of fly ash can optimize the pore structure of concrete and is beneficial to the impermeability of concrete. The main components of fly ash are SO and A2O, which have certain activity, which is also beneficial to the long-term strength development of concrete. 13 Engineering Application Overview The fly ash mechanism sand concrete is used in the construction of multiple bridges on the Shanghai-Chengxi Expressway, of which C40 concrete is used. Compared with the construction for hollow slabs, the C50 concrete mix ratio is used for the construction of prefabricated T beams.

4 Conclusions In the construction of highways in mountainous areas, the problem of shortage of natural sand resources was encountered. The C40C50 mechanism sand concrete was prepared by using the fly ash and superplasticizer double-mixing technology to make the mechanism sand concrete mixture more stable and easy to pump. After construction, the properties of the concrete become more stable after hardening. And used in the project, has achieved good economic and social benefits.

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