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采用膨胀水泥或膨胀剂配制的混凝土称为膨胀混凝土。它分为收缩补偿混凝土与自应力混凝土两种。收缩补偿混凝土,其体积膨胀在加以限制的条件下,能导入压应力来抵消因干缩、徐变,温度等引起的拉应力。预压应力值一般为2~7kg/cm2。自应力混凝土,用钢筋等限制其膨胀,混凝土中建立的压应力除能完全抵消因干缩等因素产生的拉应力外,在混凝土中还能根据需要,保留8~80kg/cm2(一般为20~40kg/cm2)的预压应力(自应力)值。
Expanded cement or expansive agent formulated concrete is called expansive concrete. It is divided into two kinds of shrinkage compensation concrete and self-stressing concrete. Shrinkage compensation of concrete, the volume expansion under the conditions to be limited, can be imported into the compressive stress to offset due to shrinkage, creep, temperature and other tensile stress. Pre-stress value is generally 2 ~ 7kg / cm2. Self-stressing concrete, reinforced with steel to limit its expansion, in addition to compressive stress in concrete to completely offset due to shrinkage and other factors generated tensile stress, but also in the concrete according to the need to retain 8 ~ 80kg / cm2 (usually 20 ~ 40kg / cm2) pre-stress (self-stress) value.