a crack-resistant concrete
A technology of concrete and anti-cracking agent, applied in the field of anti-cracking concrete, can solve the problems of low tensile strength, low flexural strength, weak fire resistance and anti-explosion performance, etc., and achieve the effect of preventing concrete from cracking and improving flexural strength and toughness.
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Embodiment 1
[0019] A kind of anti-crack concrete, the composition ratio is as follows: aggregate 2.5%; concrete 90%; steel fiber 1%; anti-crack agent 1%; polypropylene fiber 5.5%.
[0020] Concrete is made by mixing ordinary Portland cement and high alumina cement at a ratio of 2:1.
[0021] The index number of ordinary Portland cement is 42.5, and the concrete is ordinary concrete of C50 grade.
[0022] Aggregate consists of crushed stones with a particle size of 5mm, a powder content of 5.2% and a fineness modulus of 1.5.
[0023] The steel fiber length is 1 mm.
[0024] The anti-cracking agent adopts the HEA type concrete anti-cracking agent produced by Beijing Kaijian Changsheng Engineering Technology Co., Ltd.
[0025] Using the conventional concrete preparation method in this field, in order to make the crack-resistant concrete better achieve compactness, the mixing time is 2.5-3.0 minutes to ensure uniform mixing. And after its initial setting, it must be watered and maintained ...
Embodiment 2
[0029] A kind of anti-crack concrete, the composition ratio is as follows: aggregate 30%; concrete 30%; carbon fiber 20%; anti-crack agent 10%; polypropylene fiber 10%.
[0030] Concrete is made by mixing Portland cement and phosphate cement in a ratio of 2:1.
[0031] The index number of ordinary Portland cement is 42.5, and the concrete is ordinary concrete of C50 grade.
[0032] Aggregate consists of crushed stone with a particle size of 25mm, a powder content of 5.2% crushed stone and a fineness modulus of 1.5.
[0033] The length of carbon fiber is 45mm.
[0034] The anti-cracking agent adopts the HEA type concrete anti-cracking agent produced by Beijing Kaijian Changsheng Engineering Technology Co., Ltd.
[0035] Preparation method is the same as embodiment one, and the crack-resistant concrete performance that prepares is as follows:
[0036]
Embodiment 3
[0038] A kind of anti-crack concrete, the composition ratio is as follows: aggregate 30%; concrete 20%; steel fiber 20%; anti-crack agent 10%; polypropylene fiber 10%.
[0039] Concrete is made by mixing ordinary portland cement, high alumina cement and phosphate cement in a ratio of 1:1:1.
[0040] The index number of ordinary Portland cement is 42.5, and the concrete is ordinary concrete of C50 grade.
[0041] Aggregate includes gravel, particle size is 25mm, and the powder content of described crushed stone is 5.2%, and the fine number modulus of crushed stone is 1.5.
[0042] The length of the steel fibers is 45mm.
[0043] The anti-cracking agent adopts the HEA type concrete anti-cracking agent produced by Beijing Kaijian Changsheng Engineering Technology Co., Ltd.
[0044] Preparation method is the same as embodiment one, and the crack-resistant concrete performance that prepares is as follows:
[0045]
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