Installing and dismantling the formwork are not easy in cast-in-situ multi-ribbed slab construction,the formwork technology overcomes the difficult problem.This paper mainly introduces the construction technology and quality standards of the plastic formwork.Through the engineering practice,the author sums up the advantages of this technology.

This paper test the strength intensity,water absorption property of 10 baking—free bricks using the matrix cementing component in waster concrete as the material,studies the effect of m~ing ratio and maintenance time on pmpe~y to get the best mKing ratio of this kind of brick.It also analyzes the intension resources of this brick.

Soil-water characteristic curve is used to describe the matrix suction and water content of the curve of the relationship between volume, according to the soil-water characteristic curve can be deduced the unsaturated soil shear strength, permeability coefficient, etc., this paper gives the different initial water content and different types of soil, soil-water characteristic curve for practical engineering foundation reinforcement to provide reference.

This study focuses on the following: analysis of the basic mechanical properties of freeze-thaw cycles BFRP composite; freeze-thaw cycle on BFRP reinforced concrete structures force performance; provide experimental basis for the the basalt FRP freeze-thaw environment concrete structure andtheoretical support.

Combined with practical engineering，this paper analyzes the mechanism of mass concrete temperature and shrinkage cracks, from raw material selection, structure design, construction, monitoring and management five aspects,the author respectively gives the countermeasures on temperature and shrinkage crack of mass concrete, reference for engineers.