Because the quality of GRC components will be tested by time on the one hand and eroded by the service environment on the other hand, GRC components must have durability.

1、抗?jié)B性：是指壓力水通過(guò)其內(nèi)部的能力。如果抗?jié)B性差，則易使GRC構(gòu)件中的鋼筋銹蝕，影響構(gòu)件的使用壽命。影響抗?jié)B性的因素主要有水泥的品種、用量、石子粒徑大小 和級(jí)配。水灰比的大小以及GRC構(gòu)件密實(shí)程度。

1. Impermeability: refers to the ability of pressurized water to pass through its interior. If the impermeability is poor, it is easy to rust the reinforcement in GRC members and affect the service life of members. The main factors affecting the impermeability are the variety and dosage of cement, stone particle size and gradation. The water cement ratio and the compactness of GRC components.

2、抗凍性：是GRC構(gòu)件在飽和水狀態(tài)下遭受冰凍時(shí)抵抗冰凍破 壞的能力。這是因?yàn)镚RC構(gòu)件內(nèi)部存在著許多連通的或不連通的孔 隙，這些孔隙成為水分的通道和貯水庫(kù)，當(dāng)GRC構(gòu)件處于飽和水狀 態(tài)下受到冰凍。內(nèi)部水分凍結(jié)，體積可膨脹8%，導(dǎo)致孔隙脹大并 能產(chǎn)生拉應(yīng)力。所以經(jīng)過(guò)融化、凍結(jié)反復(fù)循環(huán)，就可能在拉應(yīng)力超過(guò)GRC構(gòu)件的抗拉強(qiáng)度時(shí)，開(kāi)始產(chǎn)生徽裂縫并不斷擴(kuò)展和裂縫連 結(jié)。后使GRC構(gòu)件開(kāi)裂而破壞。

2. Frost resistance: it refers to the ability of GRC members to resist freezing damage when they are frozen in saturated water. This is because there are many connected or disconnected pores in GRC members, which become water channels and reservoirs. When GRC members are in saturated water state, they are frozen. The internal water is frozen, and the volume can expand by 8%, resulting in pore expansion and tensile stress. Therefore, after repeated cycles of melting and freezing, cracks may begin to occur and continue to expand and connect with cracks when the tensile stress exceeds the tensile strength of GRC members. Finally, GRC members are cracked and damaged.

3、耐蝕性：是指GRC構(gòu)件在使用環(huán)境中，GRC構(gòu)件抵抗外界 侵蝕介質(zhì)腐蝕的能力。如抵抗酸、鹽類化學(xué)介質(zhì)的侵蝕，堿骨料 反應(yīng)和碳化等。這些介質(zhì)的侵蝕均可使GRC構(gòu)件的強(qiáng)度降低，或破壞GRC構(gòu)件結(jié)構(gòu)體積，影響使用壽命。

3. Corrosion resistance: refers to the ability of GRC components to resist the corrosion of external corrosive media in the service environment. Such as resisting the erosion of acid and salt chemical media, alkali aggregate reaction and carbonization, etc. The erosion of these media can reduce the strength of GRC components, or destroy the structural volume of GRC components and affect the service life.