As reinforced material, basalt fiber is added into cement-based material. In this paper, the influence of basalt fiber on the performance of cement-based material is made experiment to look for the more appropriate. The content and length of basalt fiber is the important factors affecting the fluidity, flexural strength and compressive strength.

Because the crack repairing technology is varied, the crack repair application has certain complexity, and part of the project due to the repair technology unreasonable type selection. So it is necessary for all kinds of crack repairing technology was studied, on the basis of the best cost-effective choice method, crack repair engineering for reference. This study presents the basalt fiber cement mortar with BICS comprehensive repair of crack, and experimental research was done, according to the test results and the engineering experience, put forward the basic procedures and technology of crack repair method, providing reference for project application.

Analyzing the related literature at home and abroad, this paper summarized the results and shared them with reasearchers involved in the field on the recycled aggregate concrete (RAC). In this paper, the durability of RAC will be described from the following several aspects: absorption, chloride permeability, freezing and thawing resistance, carbonation, the sulfate corrosion resistance, drying shrinkage, creep and abrasion resistance. This paper expounded the present situation and progress in the study of the durability of recycled aggregate concrete.Then, some key technical problems needed to be studied were pointed out and many suggestions were put forward.

Cement mortar as the basic material and the fly ash and silicon fume as the research object, experiment and research were operated through adjusting the admixture replacing dosage and changing the mixture ratio of silica fume and fly ash. By testing the fluidity and strength and data analysis and discussion, some conclusions are drawn from the analysis, such as: fly ash makes the fluidity increasing with the admixture replacing dosage below 30%, and the fluidity declines with the mixture ratio of silica fume and fly ash increasing. 7d compressive strength decreases with the admixture replacing dosage increasing, 7d compressive strength increases slowly with the mix ratio of silica fume and fly ash. With the mix ratio of silica fume and fly ash increasing, 28d compressive strength of mortar also increases, and proper mix ratio of silica fume and fly ash is 1:1.

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.