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快硬硫铝酸盐水泥 | ||||||||||||||||||||||||||||||||||||
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快硬硫铝酸盐水泥 rapid hardening sulphoaluminate cement 一、产品用途 该水泥是我公司与上海水泥有限公司联合研制开发的一个特种水泥新品种。其特性是早期强度高、微膨胀、干缩小。适用于突击抢修、快速施工的紧急工程和冬季负温施工、地质固井、喷锚支护等特殊工程；用于隧道、地铁、公路、桥梁、港口、机场等混凝土建筑物的加固修补；配制收缩补偿混凝土、抗硫酸盐侵蚀混凝土；用于基础预埋孔灌浆，构件拼装等。 二、技术要求
自由膨胀率： 1:0.5 灰砂化， 28 天自由膨胀率 0.00% ～ 0.15% 。 Extra-rapid-hardening micro expansive aluminate sulfate cement USAGES This cement is a new special brand jointly developed by our company and Shanghai Cement Co.,Ltd it has the feature of early high strength, micro expansive, small dry contraction, is fit for use in rush repairs, urgent construction and projects, winter construction below zero centigrade, Geological well-fixing, jet and anchoring and so on; also is used in the concrete fixing and repairs of such buildings as tunnels, subways, highways, bridges, harbors and airports; the preparation of contraction and compensatory concrete, anti-sulph ate erosion concrete; is used in basic built-in holes grouting, component build up, etc. TECHNICAL REQUIREMENT
Free expansive rate: 1:0.5 lime and sand , 28d free expansive rate 0.00 % ～ 0.15%.
PACKAGING, STORAGE AND TRANSPORT The cement is packed damp proof packages. The net weight of each is 50kg ; and not less than 98% of the signed weight. the total weight of 20 packages of random checking is no less than 1000kg . Other forms of packaging are to be decided by the supply and requisitioning parties . In transport and storage special attention should be paid to guard against dampness and not to be mixed with other miscellaneous articles.The period of storage cannot be more than 3 months. If the time limit is exceeded, or is dampened and caked, it can be used only after being rechecked to see that it is qualified. POINTS FOR ATTENTION 1) The cement can set quickly, when preparing mortar or concrete, use it up before it loses elasticity, the amount of each batch should be moderate,the mixing site should be as close to the pouring site as possible, the operation should be fast;2) In non-urgent projects requiring prolonging operation time and improve concrete or mortar liquidity, water-reducing agent or retarding agent can be mixed into it.The commonly used water-reducing agent includes SN-11 , lignin calcium sulphonic acid, etc. The commonly used retarding agent includes tartaric acid (potassium , sodium), citric acid , the amount of mixture can be determined by test; 3) The range of water-lime ratio of this cement is wide, when the ratio is high, coagulation time , strength and micro expansive performance will be affected ,therefore suitable ratio of water and lime should be decided according to the specific condition of the project; 4) Aluminate sulfate reacts with water quickly , when concrete mixing with mortar,water must be put into it once , and additional adding of water is not allowed; 5) The cement when being mixed with water , has strong viscosity, must be vibrated mechanically to avoid honeycombs and holes; 6) Concretes poured by this cement should be cured carefully , after pouring ,immediately cover it with water-sucking materials such as damp straw bags to keep its surface damp,and curing for 24 hours. Even already in operation, it still needs damp maintaining in 1-3 days,and preventing from insolation of the sun. 7) Not allowed to be used with silicate cement or other brands of cement, can not be used with unhardened silicate cement but can be used with hardened silicate cement concrete; | ||||||||||||||||||||||||||||||||||||
