Enhanced polycarboxylic acid system concrete reducing agent and preparation method therefor
A polycarboxylate-based concrete technology, applied in the field of concrete, can solve the problems of formaldehyde not being environmentally friendly, potential safety hazards, complex preparation process of melamine high-efficiency water reducer, etc., and achieve the effects of good adaptability, enhanced strength, and dense arrangement
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[0019] Example 1
[0020] Step (1): Preparation of a reinforced polycarboxylate concrete glue reducer:
[0021] The methallyl polyoxyethylene ether (number average molecular weight is 1400) polycarboxylic acid water reducing agent 22%, N-hydroxyethyl ethylene diamine 9%, methyl cellulose 2.5%, molecular weight 18000 poly 1% vinyl alcohol, 0.2% sodium nitrite and 65.3% water were stirred at 20°C for 4 hours to obtain a reinforced concrete glue reducer.
[0022] Step (2): The solid content of a reinforced concrete glue reducer prepared above is 0.3% of the mass of the cementing material and mixed into the concrete, and the standard curing is 3d, 7d, 28d.
Example Embodiment
[0023] Example 2
[0024] Step (1): Preparation of a reinforced polycarboxylate concrete glue reducer:
[0025] The methallyl polyoxyethylene ether (number average molecular weight is 5000) polycarboxylic acid water reducer 17%, N,N,N',N'-tetrahydroxyethylethylenediamine 5%, carboxymethyl 3% cellulose, 0.8% polyvinyl alcohol with a molecular weight of 20,000, 0.5% sodium nitrite and 73.7% water were stirred at 26°C for 3 hours to obtain a reinforced concrete glue reducer.
[0026] Step (2): The solid content of a reinforced concrete glue reducer prepared above is 0.4% of the mass of the cementitious material and mixed into the concrete, and standard curing is 3d, 7d, 28d.
Example Embodiment
[0027] Example 3
[0028] Step (1): Preparation of a reinforced polycarboxylate concrete glue reducer:
[0029] The methallyl polyoxyethylene ether (number average molecular weight is 8000) polycarboxylic acid water reducing agent 15%, N-hydroxyethyl ethylene diamine 10%, hydroxyethyl cellulose 3%, molecular weight 25000 0.5% of polyvinyl alcohol, 0.1% of sodium nitrite and 71.4% of water were stirred at 32°C for 2.5 hours to obtain a reinforced concrete glue reducer.
[0030] Step (2): Add 0.5% of the mass of the cementitious material into the concrete with a solid content of the reinforced concrete reducer prepared above, and standard curing 3d, 7d, 28d.
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