Impact-resistant compressed carbon fiber polymer latex powder composite modified concrete

[0017] Example 1

[0018] The present invention provides an impact-resistant compression carbon fiber polymer latex powder composite modified concrete. The components and contents are as follows: concrete matrix material 86.75%-88.85%, modified admixture of carbon fiber 0.15%-0.25% and polymer Latex powder 11%-13%; among the admixtures, water reducing agent 4.65kg/m3, defoaming agent 1.16kg/m3, film forming aid 2.34kg/m3, dispersing agent 1.56kg/m3; of which cement is 42.5 Portland cement or ordinary Portland cement, the sand uses medium river sand with a fineness modulus of 2.6-3.0; the stone uses graded gravel with the maximum particle size not exceeding 20mm; the water reducing agent uses FDN superplasticizer mother liquor ; The antifoaming agent adopts the common defoaming agent of metal soap; the film forming aid adopts the DN-12 type film forming aid; the dispersant adopts hydroxyethyl cellulose dispersant.

[0019] The proportion and specific components of the carbon fiber-polymer latex powder composite modified concrete involved in this embodiment are: the water-cement ratio (the mass ratio of the amount of water in the concrete to the amount of cement) is 0.49, and the volume ratio of carbon fiber is 0.15%. The polymer volume ratio is 11%, the carbon fiber volume ratio is 0.15%, and the sand ratio (the percentage of the mass of sand in the concrete to the total mass of sand and stone) is 34%.

[0020] Specific available:

[0021]

[0022]

[0023] Technical indicators reached:

[0024] 28-day compressive strength 38.4MPa

[0025] 28-day split tensile strength 4.29MPa

[0026] 28-day flexural strength 8.47MPa

[0027] The preparation method of carbon fiber-polymer latex powder composite modified concrete involved in this example includes the following steps:

[0028] The first step is to determine the mixing ratio of concrete, the volume ratio of carbon fiber and latex powder: According to the concrete number to be equipped, the trial mixing method is used to determine the material mixing ratio of concrete;

[0029] The second step is to prepare the required materials: prepare the required sand, stone, cement, carbon fiber, and latex powder according to the material ratio of the carbon fiber-polymer latex powder composite modified concrete;

[0030] The third step of fiber dispersion: pour the prepared water and dispersant into a mixer and stir at low speed to form a uniform gel. Then add carbon fiber and keep stirring at low speed, then add water reducing agent, film forming aid and part of defoamer to uniform dispersion ;

[0031] The fourth step is dry mixing latex powder and cement: mix the redispersible polymer latex powder with cement, and dry mix until the powder is evenly dispersed;

[0032] Step 5: Wet mix the remaining materials: Pour the fine aggregate and half of the carbon fiber dispersion into the mixer and stir, then add the coarse aggregate until the dispersion is evenly distributed, then add the remaining carbon fiber dispersion and defoamer and stir evenly to the desired level Slump is enough;

[0033] The peak strain of the 28-day carbon fiber-polymer latex powder concrete prepared in this example is 152% higher than that of plain concrete with the same mix ratio; the peak toughness of the 28-day carbon fiber-polymer latex powder concrete is compared with plain concrete with the same mix ratio An increase of 187%.

[0034] Example 2

[0035] The proportion and specific components of the carbon fiber-polymer latex powder composite modified concrete involved in this embodiment are: the water-cement ratio is 0.49, the carbon fiber volume ratio is 0.2%, the polymer volume ratio is 12%, and the carbon fiber volume ratio is 0.15%. , The sand rate is 34%. Specific available

[0036]

[0037] The preparation method of carbon fiber-polymer latex powder composite modified concrete involved in this example includes the following steps:

[0038] The first step is to determine the mixing ratio of concrete, the volume ratio of carbon fiber and latex powder: According to the concrete number to be equipped, the trial mixing method is used to determine the material mixing ratio of concrete;

[0039] The second step is to prepare the required materials: prepare the required sand, stone, cement, carbon fiber, and latex powder according to the material ratio of the carbon fiber-polymer latex powder composite modified concrete;

[0040] The third step of fiber dispersion: pour the prepared water and dispersant into a mixer and stir at low speed to form a uniform gel. Then add carbon fiber and keep stirring at low speed, then add water reducing agent, film forming aid and part of defoamer to uniform dispersion ;

[0041] The fourth step is dry mixing latex powder and cement: mix the redispersible polymer latex powder with cement, and dry mix until the powder is evenly dispersed;

[0042] Step 5: Wet mix the remaining materials: Pour the fine aggregate and half of the carbon fiber dispersion into the mixer and stir, then add the coarse aggregate until the dispersion is evenly distributed, then add the remaining carbon fiber dispersion and defoamer and stir evenly to the desired level Slump is enough.

[0043] The peak strain of the 28-day carbon fiber-polymer latex powder concrete prepared in this example is 173% higher than that of plain concrete with the same mix ratio; the peak toughness of the 28-day carbon fiber-polymer latex powder concrete is compared with the plain concrete with the same mix ratio An increase of 269%

[0044] Example 3

[0045] The proportion and specific components of the carbon fiber-polymer latex powder composite modified concrete involved in this embodiment are: water-cement ratio of 0.49, carbon fiber volume ratio of 0.25%, polymer volume ratio of 13%, and carbon fiber volume ratio of 0.15% , The sand rate is 34%. Specific available

[0046]

[0047]

[0048] The preparation method of carbon fiber-polymer latex powder composite modified concrete involved in this example includes the following steps:

[0049] The first step is to determine the mixing ratio of concrete, the volume ratio of carbon fiber and latex powder: According to the concrete number to be equipped, the trial mixing method is used to determine the material mixing ratio of concrete;

[0050] The second step is to prepare the required materials: prepare the required sand, stone, cement, carbon fiber, and latex powder according to the material ratio of the carbon fiber-polymer latex powder composite modified concrete;

[0051] The third step of fiber dispersion: Pour the prepared water and dispersant into the mixer and stir at low speed to form a uniform gel. Then add carbon fiber and keep stirring at low speed, then add water reducing agent, film forming aid and part of defoamer to uniform dispersion ;

[0052] The fourth step is to dry mix latex powder and cement: mix the redispersible polymer latex powder with cement, and dry mix until the powder is evenly dispersed;

[0053] Step 5: Wet mix the remaining materials: Pour the fine aggregate and half of the carbon fiber dispersion into the mixer and stir, then add the coarse aggregate until the dispersion is evenly distributed, then add the remaining carbon fiber dispersion and defoamer and stir evenly to the desired level Slump is enough.

[0054] The peak strain of the 28-day carbon fiber-polymer latex powder concrete prepared in this example is 164% higher than that of the plain concrete with the same mix ratio; the 28-day peak toughness of the carbon fiber-polymer latex powder concrete is compared with the plain concrete with the same mix ratio An increase of 197%.

[0055] In the present invention, by selecting a suitable dispersant, the carbon fiber is dispersed uniformly, thereby better exerting the reinforcing and anti-cracking effect of carbon fiber, making full use of the chemical bonding between carbon fiber and concrete, enhancing the transition zone between fiber and concrete, and adding The friction resistance between the fiber and the matrix is ​​increased, and the deformation resistance of the interface is significantly improved. The use of a lower fiber content does not affect the traditional mixing process of concrete. It achieves the high-quality effect of low fiber content and high toughness concrete, which can be applied to For any concrete structure on-site construction, use the small size effect of polymer latex powder to disperse carbon fiber, give full play to the good dispersion effect of latex powder, make full use of the modification effect of polymer latex powder on concrete, and improve the internal interface of concrete The microstructure of the transition zone increases the cohesiveness of the cement paste matrix. Using the multi-phase and multi-level characteristics of the concrete material itself, through the optimized addition of two external admixtures, carbon fiber and latex powder, both carbon fiber and latex powder It has good matching and bonding with concrete, so that it has high strength, high modulus and high toughness as a whole, prevents concrete from breaking, obviously improves concrete's impact resistance, fire and explosion resistance, etc., which is conducive to mass rapid construction and can be widely used It is applied to the concrete structure of anti-impact load in the fields of civil engineering, water conservancy, municipal transportation, ocean and military industry.