Retarding type high-fluidity high-strength underwater concrete additive and preparation method thereof
An underwater concrete and high fluidity technology, applied in the field of building materials, can solve problems such as not suitable for long-distance transportation and construction, lack of research on durability such as permeability, and unsatisfactory concrete material systems, so as to improve volume stability and durability, improving volume stability, and improving durability
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Embodiment 1
[0021] A retarding type high-fluidity high-strength underwater concrete additive, which is obtained by grinding metakaolin and a composite modifier in a ball mill for 30 minutes, wherein the mass ratio of metakaolin to the composite modifier is 15:1, the described The composite modifying agent is prepared by mixing polyacrylamide, polycarboxylate water reducer and sucrose in the order of 80%, 15% and 5% by mass.
[0022] Taking the mortar specimen as the object of investigation, metakaolin was used to replace the cementitious material with 6%, 8%, and 12% respectively, and 1% water reducing agent was added to prepare the mortar. River sand (passed through a 2.36mm sieve) and the retarded high-fluidity high-strength underwater concrete additive of Example 1 were added at 6%, 8%, and 12% respectively, and the water-cement ratio was 0.45.
[0023] According to GB / T 2429-2005 "Measurement Method for Fluidity of Cement Mortar Sand", test the fluidity of the mixture of the reference...
Embodiment 2
[0034] A retarding type high-fluidity and high-strength underwater concrete additive, which is ground in a ball mill for 120 minutes by metakaolin and a composite modifier, wherein the mass ratio of metakaolin to the composite modifier is 20:1, and the composite The modifying agent is prepared by mixing polyacrylamide, polycarboxylate water reducer and sucrose in the order of 75%, 20% and 5% by mass.
[0035] Taking the concrete specimen as the object of investigation, the additives in Example 2 are used to replace the cementitious material in an equivalent amount of 10% to configure the concrete. Slump and expansion; according to GB / T 50081-2002 "Standard for Test Methods of Mechanical Properties of Ordinary Concrete", test the benchmark sample and the additives of Example 2 with a universal pressure testing machine for 7 days and 28 days of compressive strength; concrete anti-dispersion The test was carried out according to Q / CNPC92-2003. The cement loss was 1.1%, the pH wa...
Embodiment 3
[0037] A retarding type high-fluidity high-strength underwater concrete additive, which is obtained by grinding metakaolin and a composite modifier for 90 minutes in a ball mill, wherein the mass ratio of metakaolin to the composite modifier is 30:1, the described The composite modifier is prepared by mixing polyacrylamide, polycarboxylate water reducer and sucrose in the order of 70%, 25% and 5% by mass.
[0038] Taking concrete specimens as the object of investigation, metakaolin-based additives are used to replace cementitious materials in an equivalent amount of 12% to configure concrete, and the slump of freshly mixed concrete is tested according to GB / T 50080-2002 "Standard for Test Methods for Performance of Ordinary Concrete Mixtures" and expansion degree; in accordance with GB / T 50081-2002 "Standard for Test Methods of Mechanical Properties of Ordinary Concrete", use a universal pressure testing machine to test the 7-day and 28-day compressive strength of the benchmark...
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