Preparation method for frost-resistant concrete
A concrete and anti-freeze-thaw technology, which is applied in the field of preparation of anti-freeze-thaw concrete, can solve the problems of reducing the mechanical properties of concrete, the reduction of freezing point is not large, and the effect of anti-freezing and thawing cannot be achieved.
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Embodiment 1
[0014] Embodiment 1: A preparation method of freeze-thaw resistant concrete.
[0015] Clay pottery sand is used. The cylinder compressive strength of pottery sand is 2.3 MPa. Soak pottery sand in ethylene glycol of analytical grade. After pottery sand fully absorbs ethylene glycol, spray on the surface of pottery sand with a concentration of 5 % polyvinyl alcohol solution, so that the surface of the ceramic sand is covered with a layer of organic film. After the film is formed, a layer of cement slurry with a water-cement ratio of 0.3 is coated on the surface of the ceramic sand. After the slurry is hardened, the ceramic Sand is used to replace the fine aggregate in ordinary C30 at a ratio of 10%. At the same time, freeze-thaw resistant C30 concrete with air-entraining agent is prepared, and the freeze-thaw resistance of three concretes is tested: ordinary C30 concrete: frost-resistant grade F50. Air-entrained concrete C30 concrete: frost resistance grade F200. The C30 concre...
Embodiment 2
[0017] Embodiment 2: A preparation method of freeze-thaw resistant concrete.
[0018] A method for preparing freeze-thaw-resistant concrete. Firstly, pottery sand is soaked in a mixture of ethylene glycol and glycerin, and then a polyvinyl alcohol aqueous solution is sprayed on the surface of the pottery sand to coat a layer on the surface of the pottery sand. Organic film, and then cover a layer of cement slurry on the surface of the pottery sand. The volume ratio between ethylene glycol and glycerol is 1:1.
[0019] A preferred embodiment is: the pottery sand is shale.
[0020] A preferred embodiment is: the ethylene glycol and glycerol are both analytically pure.
[0021] A preferred embodiment is: the cylinder compressive strength of the pottery sand is greater than or equal to 2.1 MPa.
[0022] A preferred embodiment is: the degree of alcoholysis of the polyvinyl alcohol is 90%.
[0023] A preferred embodiment is: the mass percent concentration of the polyvinyl alcoho...
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