Preparation method for extruded polystyrene (XPS)-foaming cement composite self-thermal-insulation L-shaped wall corner building block

The invention discloses a preparation method for an extruded polystyrene (XPS)-foaming cement composite self-thermal-insulation L-shaped wall corner building block. According to the preparation method disclosed by the invention, the prepared composite building block comprises two parts, namely an XPS insulation board mould body and foaming cement, wherein the XPS insulation board mould body is prepared by an extrusion moulding method and adopts an L-shaped three-dimensional structure, the center of the L-shaped stereo structure is a cavity, connection reinforcing ribs are arranged in the cavity, the cavity in an XPS insulation board is filled with the foaming cement, and the foaming cement and the XPS insulation board mould body are solidified and bonded together to be utilized as a sandwich material. The composite self-thermal-insulation building block disclosed by the invention has the advantages that the thermal insulation effect is good, the body weight is light, the compressive strength is high, the strength can be regulated and controlled, the shock resistance is high, the sound insulation performance, the seismic performance, the moisture resistance and the frost resistance are good, the long-term stability is excellent, the flame retardance and fire resistance are good (the fireproofing grade of the utilized XPS is B1 and the fireproofing grade of the utilized foaming cement is A), the production process is simple, the construction and building are convenient, and the comprehensive cost is low; the composite self-thermal-insulation building block is especially suitable for construction of passive houses.