Retardation pumping type three-expansion source cement expansive material
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An expansion agent and concrete technology, applied in the field of concrete expansion agent, can solve the problems of insufficient synchronization of compensation shrinkage, many exposure problems, poor compatibility, etc., and achieve strong adaptability, improved comprehensive physical properties, and good compatibility Effect
Inactive Publication Date: 2009-06-17
广西云燕特种水泥建材有限公司
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However, there are still deficiencies in the composite expansion agents currently on the market: ①The expansion rate is low; ②The alkali content is high; ③The expansion source is single, and the compensation for shrinkage is not synchronized; The compatibility of the product is not good, and many problems are exposed when used
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Embodiment 1
[0063] (1), the preparation process formula is shown in Table 1:
[0067] The bulk raw material gypsum, high alumina clinker, high calcium sulfur aluminum clinker, and calcined magnesite are sequentially → The second storehouse → The second homogenization storehouse → Obtain ordinary expansion agent → According to Table 1, mix external materials, externally add water-reducing agent polycarboxylate, water-retaining agent cellulose ether HPMC, air-entraining agent K12 and delay Sodium gluconate → mixed in the third mill → third hopper → third homogenization silo...
Embodiment 2
[0073] (1), the preparation process formula is shown in Table 3
[0077] The bulk raw material gypsum, high alumina clinker, high calcium sulfur aluminum clinker, and calcined magnesite are sequentially → The second storehouse → The second homogenization storehouse → Obtain ordinary expansion agent → According to Table 1, mix external materials, externally add water-reducing agent polycarboxylate, water-retaining agent cellulose ether HPMC, air-entraining agent K12 and delay Sodium gluconate → mixed in the third mill → third hopper...
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Abstract
The invention discloses a slow hardening pump deliver type three expansion source concrete expansion agent, which is characterized by comprising preparation of raw materials such as anhydrite, high alumina chamotte, high-calcium sulphoaluminate chamotte, calcined magnesite and so on by weight portion and externally doped slushing agent, water retention agent, air entraining agent and retardant. The preparation method of the expansion agent comprises steps of crushing, common mixture, mixing and grinding and external doping mixture and finish product forming. The product has low alkali content, excellent expansion performance, strong suitability with concrete, balanced mechanical property after hardening, and small gradual slump loss of concrete shrinkage compensation, contributes to improving safety and durability of reinforced concrete, obviously improves the cracking resistance, volume stability, impermeability and frost resistance, and is simple and convenient to use and easy to control quality in construction. The slow hardening pump deliver type three expansion source concrete expansion agent can meet construction use requirements of commercial concrete, long distance pump-delivering concrete and mass concrete.
Description
technical field [0001] The present invention relates to concrete, especially concrete expansive agent. technical background [0002] With the large-scale application of commercial and high-performance concrete in my country, the prominent contradiction is that the probability of cracks in concrete engineering increases, and harmful cracks are directly related to the durability of structures. Commercial housing has involved people's livelihood issues, and users have strongly responded to this. In recent years, the Ministry of Construction and engineering circles have attached great importance to the control of concrete cracks. From the material point of view, concrete expansion agent, shrinkage reducer, steel fiber and synthetic organic fiber are all effective measures to reduce or disperse cracks, but in terms of material price and construction convenience, expansion agent has more advantages. Academician Wu Zhongwei of my country pointed out that "micro-cracks to visible c...
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