Property And Application Of Additive Concrete Research

Concrete as the most largely quantity used in project structure material nowadays, its duration is paid more and more attention to. At the condition of raw materials resource in being, the major measures to improve the durability of concrete are improve the pore structure in the mortar and compact of concrete, and make the best to eliminate unsteady factor of hydration of cement, but in practical project admixtures and additives are more widely used to reach this purpose.The paper is base on the project Yusui road LiShuWang-tunnel concrete, the influence of additive to concrete durability is studied. It contain the concrete property of permeability, Cl^- penetrate resistance, air penetrate resistance and sulphate corrode resistance.The experimental result show that:1) dditives improve the workability and physical mechanical property.2) dditives improve the concrete property of permeability, Cl" penetrate resistance, air penetrate resistance and sulphate corrode resistance, but different kind additive the improve degree is different.3) dditives have different degreed effect in smaller the mortar pore structure of concrete. The special area, cubage and average radii of pores are decreased largely, and the distribution of pore radii are improved clearly.Combine the design require of C25 C30 corrode resistance low air permeability concrete in project Li Shu Wang-tunnel in Chongqing, while the durability, economic and operable are considered, high property additive + superplasticizer +and other additive used in concrete is adopted. The test result in job site show that, compressive strength of concrete accord with C25 and C30 design, corrode resistance coefficient is high than 0.90, air penetrate low than 1.0×10^-1cm/s, permeability class is high than P10, all of these is satisfy corrode resistance low air permeability concrete design.