A: Features This product composite by antifreeze sodium nitrite, urea and other materials from the carrier, as a gray powder, pH, 8-9, is non-chlorine salts antifreeze, both antifreeze and water-reducing effect. In the negative temperature conditions, with a strong antifreeze capabilities, and concrete with high early strength and excellent technical performance. HF composite antifreeze for reinforced concrete construction concrete daily minimum temperature of -5 ~ -15 ℃ in winter, high slump concrete and pumping concrete. II: Technical performance 1: This product has reduced the role of the freezing point and has a good water-reducing effect, reducing the rate of up to 10% water. Air entrainment is less than 3%, concrete frost grade> F50. Negative temperature conditions under pouring concrete, 7d strength up to 50% of the design strength, 28d strength of up to 80% of the design strength, even in the negative temperature, the intensity can still increase 28d later. As a negative into a positive temperature curing temperature and curing after 28d 28d, strength exceeds design standards. 2: This product has frost, rust and reduction of water features, no corrosion of steel effect. 3: cement varieties adaptable for a variety of cement. 4: This product complies with "concrete antifreeze" (JC 475-2004) and "concrete admixture technical specifications" (GB 50119 a 2013) regulations. Mixed with antifreeze concrete performance indicators in Table 6-5 and Table 6-6. Three; construction and use 1; Volume: 4% for cement quality of a 5% - below 15 ℃ can be mixed with 6 percent. Content should not be too large, in order to avoid excessive concrete surface from frost. 2; the FDA should be adopted before the test with the test, to determine the optimal mix concrete. 3; when positive temperature under a dry powder can be directly mixed with people, dissolved in water at about 60 ℃ under negative temperature use. Mixing water temperature should be appropriate, generally controlled at 40 a 50 ℃ appropriate. 4; antifreeze such as moisture caking, should be crushed and sieved after use, the effect is the same. 5; antifreeze concreting should be noted that after covering maintenance, shall watering. Initial curing temperature not lower than a predetermined temperature for use, otherwise insulation measures should be taken. 6; this must be done before using the product associated with the post-test than before use by passing the test.