Expansive cement early strength Portland cement clinker is mainly due proportion with CSA, gypsum and other features of the admixture, cement matrix expansion properties have been made from finely ground. Which is characterized by shrinkage compensation, early, late high strength, and can significantly improve the concrete (or mortar) crack, seepage performance. Volume expansion of the cement produced in the hydration and hardening process belongs to the class of cement expansion. When the general hardening of Portland cement in the air, the volume will shrink happen. Shrink cement structure will produce micro-cracks, reducing the density of the cement structure, impermeability impact structure, antifreeze, anti-corrosion. Expansion occurs in the volume of cement will not shrink during hardening, but also a slight expansion, can be solved due to shrinkage caused by the adverse consequences. First, the main technical performance of the project set time limit expansion (%) impermeability (water for 3d) compressive strength (MPa) and flexural strength (MPa) initial set final setting 3d 28d 3d 7d 28d 3d 7d 28d standard value ≥45min ≤6h ≥0.015 ≤0.10 1.0MPa / 8h 17.0 27.0 42.5 3.5 5.0 7.5 Found 230min 5h 0.020 0.036 1.0MPa / 8h 25.0 34.5 54.0 4.0 5.9 8.7 Performance Features 1. prepared by expansive cement concrete free swell in water for 8 ~ 10 × 10-4, can be established in concrete since the stress 0.2 ~ 0.6MPa meet shrinkage compensation requirements, can reduce or prevent shrinkage and cracking of concrete; 2. expansive cement concrete impermeability grade is greater than the S30. With the preparation of self waterproof cement concrete, labor and material, shorten the construction period, and durability; 3. The new micro-expansion of high early strength cement, late strength grew larger, long-term strength and stability to rise; 4. expansive cement concrete prepared by internal expansion since the establishment of a stress, and reinforced a stronger bond strength; 5. No chlorine salt, no corrosion of steel. Third, the main purpose 1. Since water seepage crack concrete projects, such as the subway, civil air defense projects, building basement, pool, waterproof roofing; 2. Shrinkage-compensating concrete structural engineering; 3. Reinforcement and mortar impervious surface engineering; 4. After the in-situ concrete pouring works with pouring; 5. Large diameter concrete drainage pipes and joints, beams and pipe fittings; 6. Configured for the machine base and anchor bolts with secondary grouting material. Fourth, note should be made before 1 trial with construction to determine a reasonable amount of expansion of concrete (or mortar); 2. Micro expansive cement under normal circumstances do not mix with other varieties of cement. Fifth, packaging and storage using expansive cement lined guts woven bag, net weight 40kg. Can also use other packaging according to user requirements. Expansive cement must be sealed and stored in a dry environment, the shelf life of six months after the first run to open the bag.