Common pipe ditch cast-in-place extrusion flow state concrete lining material

Abstract

The invention relates to a common pipe ditch cast-in-place extrusion flow state concrete lining material, which is used in an extrusion flow state concrete material. strength grade of configured concrete is C30, 42.5 grades ordinary Portland cement is adopted, content of C3A is required to be less than 8%, fineness modulus of fine aggregate are 2.6-3.0, grain size scope of coarse aggregate is 5-31.5mm, sand ratio is 36-40%, coal ash occupies 20% of total weight of gelled materials, and water to binder ratio scope is controlled in a range of 0.40-0.44. Mix proportion with the unit of Kg / m3 of the concrete material is the cement of 320-355, the river sand of 630-690, the gravel of 1080-1160, the coal ash of 80-90, water of 175-185, and dosage of flow accelerated corrosion (FAC) high efficiency slushing agent is 1.5-1.8% of the weight of the gelled material. The common pipe ditch cast-in-place extrusion flow state concrete lining material conducts a 1:1 testing model test, workability index, strength index and cement dosage all meet requirements, and anti-permeability of the concrete is larger than P20. Various indexes of the concrete all meet design requirements.

Description

technical field [0001] The invention relates to a material for extruding fluid state concrete, and mainly relates to a lining material of extruded fluid state cast-in-situ common pipe ditch. Background technique [0002] The existing common trench lining structure mostly uses prefabricated concrete segment structure, and the segment is prefabricated, transported and assembled to form the lining. This lining form is a commonly used structural form of common trenches. However, since this type of lining is assembled, its longitudinal and transverse annular joints are prone to leakage, and a large number of gaskets and bolts must be used for sealing and connection for waterproofing, and the surface settlement caused by this type of lining is relatively large , The cost of segment and its lining construction accounts for about 30% of the total construction cost, and the construction cost is relatively high. Compared with the prefabricated segment lining, the cast-in-situ extrud...

AI Technical Summary

Problems solved by technology

At present, the domestic cast-in-place extruded fluid concrete lining technology is still blank, and there is no technical plan for the preparation of cast-in-situ extruded fluid concrete