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快硬硫鋁酸鹽水泥 | ||||||||||||||||||||||||||||||||||||
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快硬硫鋁酸鹽水泥 rapid hardening sulphoaluminate cement 一、產(chǎn)品用途 該水泥是我公司與上海水泥有限公司聯(lián)合研制開發(fā)的一個(gè)特種水泥新品種。其特性是早期強(qiáng)度高、微膨脹、干縮小。適用于突擊搶修、快速施工的緊急工程和冬季負(fù)溫施工、地質(zhì)固井、噴錨支護(hù)等特殊工程；用于隧道、地鐵、公路、橋梁、港口、機(jī)場(chǎng)等混凝土建筑物的加固修補(bǔ)；配制收縮補(bǔ)償混凝土、抗硫酸鹽侵蝕混凝土；用于基礎(chǔ)預(yù)埋孔灌漿，構(gòu)件拼裝等。 二、技術(shù)要求
自由膨脹率： 1:0.5 灰砂化， 28 天自由膨脹率 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; | ||||||||||||||||||||||||||||||||||||
