A freeze-resistant highland concrete and a preparation method thereof

Abstract

The application relates to the technical field of concrete, in particular to a freeze-resistant highland concrete and a preparation method thereof. The concrete comprises the following components: cement 30-35 parts, coarse aggregate 50-60 parts, fine aggregate 100-110 parts, filler 10-14 parts, water reducing agent 0.8-1 part and air entraining agent 1.5-2 parts. The cement is Portland cement, and the Portland cement is a hydraulic cementitious material prepared by mixing and grinding Portland cement clinker, 5-20% mixed materials and appropriate gypsum. In the application, the elasticity of rubber particles in the filler is matched with fly ash to further fill the remaining gaps, liquid entering space is reduced as much as possible, freeze-thaw phenomena in the concrete are avoided, and the expansion and shrinkage of the concrete can be adapted. Basalt anti-cracking fibers can position the rubber particles, the rubber particles are kept in the position of uniform pouring, the strength of the concrete can be improved, and the resistance of the concrete to tensile stress can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of concrete, in particular to a kind of freeze-resistant highland concrete and preparation method thereof. BACKGROUND

[0002] Concrete refers to artificial stone material formed by cement as main cementitious material, water, sand, stone, if necessary, mixed with chemical admixture and mineral admixture, according to appropriate proportion, uniform stirring, compaction forming and curing hardening, in high altitude area, concrete will be affected by high cold, strong wind snow, freezing frost and other influences.

[0003] The existing freeze-resistant concrete usually uses fly ash, air entraining agent and water reducing agent to improve the void structure of concrete in order to improve the frost resistance, but for the cracking of concrete system caused by repeated freeze-thaw, which causes the loss of concrete compressive strength, simply improving the frost resistance of concrete is obviously limited, there are still a large number of gaps in concrete, leaving space for liquid to enter freeze-thaw, therefore, according to the above problems, a kind of freeze-resistant highland concrete and preparation method thereof are provided. SUMMARY

[0004] The present application aims to provide a kind of freeze-resistant highland concrete and preparation method thereof, to solve the problem that the existing freeze-resistant concrete only improves the frost resistance of concrete, and the freeze-thaw phenomenon will cause great damage to concrete.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0006] A kind of freeze-resistant highland concrete and preparation method thereof, comprising the following components by weight: cement 30-35 parts, coarse aggregate 50-60 parts, fine aggregate 100-110 parts, filler 10-14 parts, water reducing agent 0.8-1 part, air entraining agent 1.5-2 parts.

[0007] Preferably, the cement is Portland cement, and the Portland cement is a hydraulic cementitious material prepared by mixing and grinding Portland cement clinker, 5-20% of mixed materials and appropriate amount of gypsum.

[0008] Preferably, the coarse aggregate is gravel, the clay content of the coarse aggregate is required to be between 0.5-0.9%, the clay block content of the coarse aggregate is required to be between 0.1-0.4%, and the particle size of the coarse aggregate should be controlled between 5mm-9mm.

[0009] Preferably, the fine aggregate is river sand, the clay content of the fine aggregate is required to be between 0.5-2%, the clay block content of the fine aggregate is required to be between 0.3-0.9%, and the particle size of the fine aggregate should be controlled between 0.15-0.4mm.

[0010] Preferably, the filler is composed of fly ash, hot melt glue particles, rubber particles and basalt anti-cracking fibers, the fly ash, hot melt glue particles, rubber particles and basalt anti-cracking fibers are in a weight ratio of 1:0.3:3:7, and the hot melt glue particles need a hot melting point of 65 degrees.

[0011] Preferably, the water reducing agent is a polycarboxylate-based water reducing agent, and the air entraining agent is a mixture of a polybasic silicate melt, sodium dodecyl sulfate and rosin resin, and the polybasic silicate melt, sodium dodecyl sulfate and rosin resin are in a weight ratio of 1:0.6:0.2.

[0012] Preferably, the preparation method comprises the following steps:

[0013] Step one:

[0014] First, the filler is prepared, hot melt glue particles and rubber particles are placed in a mixing and heating device for mixing and heating, and when the temperature is heated to 65-70 degrees, the hot melt glue particles appear to be fused, and the melted hot melt glue can wrap the rubber particles, at this time, the basalt anti-cracking fibers are placed in, stirred for 15 min, and the basalt anti-cracking fibers are fixed by the hot melt glue and the rubber particles through the mixing of the device, and placed for 30 min to solidify to obtain a solidified material, and the mixing mechanism of the mixing and heating device is opened again to disperse the solidified material, so that each rubber particle adheres to 1-3 basalt anti-cracking fibers, and finally the fly ash is added and mixed for 15-20 min to obtain the filler;

[0015] Step two:

[0016] The raw materials are added to the mixing device in the order of coarse aggregate, fine aggregate, cement and water for 30-45 min of stirring, the filler is placed in for 15-20 min of stirring, and finally the water reducing agent and the air entraining agent are added to the mixing device for 30 min of stirring, so that the water-binder ratio reaches 0.4-0.45%, and the freeze-resistant highland concrete is obtained.

[0017] Compared with the prior art, the present application has the following advantages:

[0018] In the application, the coarse aggregate plays a skeleton role in the concrete by setting the cement, coarse aggregate, fine aggregate, filler, water reducing agent, air entraining agent and other ingredients, responsible for building a large skeleton, the fine aggregate plays a filling role, responsible for filling in the voids of the large skeleton, then the cement is filled into the small voids formed by the fine aggregate, forming a dense whole, and the elasticity of the rubber particles in the filler matched with fly ash can further fill the remaining voids, reduce the space of liquid as much as possible, avoid freeze-thaw phenomenon in the concrete, and adapt to the expansion and shrinkage of the concrete, and the basalt anti-cracking fiber can position the rubber particles, keep the rubber particles in the uniform pouring position, improve the strength of the concrete and improve the resistance of the concrete to tensile stress, solve the problem that the existing freeze-resistant concrete only improves the frost resistance of the concrete, and the freeze-thaw phenomenon still occurs, which causes great damage to the concrete. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 The application provides a filling diagram of the cross section of the concrete. DETAILED DESCRIPTION

[0020] Please refer to Figure 1 The application provides a technical scheme:

[0021] A kind of freeze-resistant highland concrete and preparation method thereof, including the following components by weight: cement 30-35 parts, coarse aggregate 50-60 parts, fine aggregate 100-110 parts, filler 10-14 parts, water reducing agent 0.8-1 part, air entraining agent 1.5-2 parts.

[0022] The cement is Portland cement, the Portland cement is a hydraulic cementitious material mixed by Portland cement clinker, 5-20% mixed material and appropriate gypsum, the Portland cement adopts a small water-cement ratio, and can obtain dense cement stone after full curing, therefore, the cement is suitable for concrete engineering in severe cold regions suffering from repeated freezing and thawing, in addition, the Portland cement mixture is not easy to bleed, the density of the hardened cement stone is large, so the frost resistance is better than that of other general-purpose cement; the coarse aggregate is gravel, the clay content of the coarse aggregate is required to be between 0.5-0.9%, the mud content of the coarse aggregate is required to be between 0.1-0.4%, and the particle size of the coarse aggregate should be controlled between 5mm-9mm, so that the coarse aggregate plays a skeleton role in the concrete and is responsible for building a large skeleton; the fine aggregate is river sand, the clay content of the fine aggregate is required to be between 0.5-2%, the mud content of the fine aggregate is required to be between 0.3-0.9%, and the particle size of the fine aggregate should be controlled between 0.15-0.4mm, the fine aggregate plays a filling role and is responsible for filling the voids in the large skeleton; the filler is composed of fly ash, hot melt adhesive particles, rubber particles and basalt anti-cracking fiber, the weight ratio of fly ash, hot melt adhesive particles, rubber particles and basalt anti-cracking fiber is 1:0.3:3:7, the hot melt adhesive particles require a hot melting point of 65 degrees, the rubber particles cooperate with the fly ash to further fill the remaining voids in the concrete, as much as possible to reduce the space for liquid to enter, avoid freezing and thawing phenomenon in the concrete, and adapt to the expansion and contraction of the concrete, while the basalt anti-cracking fiber can position the rubber particles, keep the rubber particles in a uniform pouring position, and at the same time can improve the strength of the concrete and improve the resistance of the concrete to tensile stress, the melting point of the hot melt adhesive is relatively low, which can melt the hot melt adhesive, and at the same time the rubber particles are not affected; the water reducing agent is a polycarboxylate-based water reducing agent, and the air entraining agent is a mixture of multivalent silicate melt, sodium dodecyl sulfate and rosin resin, the weight ratio of multivalent silicate melt, sodium dodecyl sulfate and rosin resin is 1:0.6:0.2, the water reducing agent cooperates with the air entraining agent to improve the frost resistance of the concrete.

[0023] The preparation method comprises the following steps:

[0024] Step one:

[0025] First, the filler is prepared, the hot melt adhesive particles and the rubber particles are placed in a mixing and heating device for mixing and heating, and when the temperature is heated to 65-70 degrees, the hot melt adhesive particles appear to be fused, and the melted hot melt adhesive will wrap the rubber particles, at this time, the basalt anti-cracking fiber is placed in, stirred for 15 minutes, the basalt anti-cracking fiber is fixed by the hot melt adhesive and the rubber particles through the mixing of the device, and the mixture is placed for 30 minutes to solidify to obtain a solidified material, the mixing mechanism of the mixing and heating device is opened again to disperse the solidified material, so that each rubber particle adheres to 1-3 basalt anti-cracking fibers, and finally the fly ash is added and mixed for 15-20 minutes to obtain the filler;

[0026] Step two:

[0027] The raw materials are added into the mixing device in the order of coarse aggregate, fine aggregate, cement and water for 30-45 min mixing, the filler is added for 15-20 min mixing, and finally the water reducing agent and air entraining agent are added into the mixing device for 30 min mixing, so that the water-binder ratio reaches between 0.4-0.45%, and the freeze-resistant highland concrete is obtained.

[0028] The principles and implementation manners of the present application are described by applying specific examples in the present application, and the above examples are only used to help understand the method of the present application and its core idea. The above is only the preferred implementation manner of the present application, and it should be pointed out that, due to the limitedness of the expression, there are objectively infinite specific structures, and for the ordinary skilled in the art, some improvements or changes can be made without departing from the principles of the present application, and the above technical features can also be combined in a proper manner; the improvements, changes or combinations, or the direct application of the inventive concept and technical solution to other occasions without improvement, shall be regarded as the protection scope of the present application.

Claims

1. A freeze resistant high altitude concrete and a method of making the same, characterized in that, Comprise the following components by weight: cement 30-35 parts, coarse aggregate 50-60 parts, fine aggregate 100-110 parts, filler 10-14 parts, water reducing agent 0.8-1 part, air entraining agent 1.5-2 parts; The cement is Portland cement, and the Portland cement is a hydraulic cementitious material prepared by mixing Portland cement clinker, 5-20% mixed material and appropriate amount of gypsum; The coarse aggregate is gravel, the clay content of the coarse aggregate is required to be between 0.5-0.9%, the clay block content of the coarse aggregate is required to be between 0.1-0.4%, and the particle size of the coarse aggregate should be controlled between 5mm-9mm; The fine aggregate is river sand, the clay content of the fine aggregate is required to be between 0.5-2%, the clay block content of the fine aggregate is required to be between 0.3-0.9%, and the particle size of the fine aggregate should be controlled between 0.15-0.4mm; The filler is composed of fly ash, hot melt adhesive particles, rubber particles and basalt anti-cracking fiber, the weight ratio of the fly ash, hot melt adhesive particles, rubber particles and basalt anti-cracking fiber is 1:0.3:3:7, and the hot melt point required by the hot melt adhesive particles is 65 degrees; The water reducing agent is a polycarboxylate-based water reducing agent, and the air entraining agent is a mixture of a multivalent silicate melt, sodium dodecyl sulfate and rosin resin, the weight ratio of the multivalent silicate melt, sodium dodecyl sulfate and rosin resin is 1:0.6:0.2; The preparation method comprises the following steps: Step one: First, the filler is prepared, the hot melt adhesive particles and rubber particles are placed in a mixing and heating device for mixing and heating, and when the temperature is heated to 65-70 degrees, the hot melt adhesive particles appear to be fused, and the melted hot melt adhesive will wrap the rubber particles, at this time, the basalt anti-cracking fiber is placed in, stirred for 15 minutes, the basalt anti-cracking fiber is fixed by the hot melt adhesive and the rubber particles through the mixing of the device, and the coagulum is obtained by placing for 30 minutes to coagulate, the mixing mechanism of the mixing and heating device is opened again to scatter the coagulum, so that each rubber particle adheres to 1-3 basalt anti-cracking fibers, and finally the fly ash is added and mixed for 15-20 minutes to obtain the filler; Step two: The raw materials are added to the stirring device in the order of coarse aggregate, fine aggregate, cement and water for stirring for 30-45 minutes, the filler is placed in for stirring for 15-20 minutes, and finally the water reducing agent and air entraining agent are added to the stirring device for stirring for 30 minutes, so that the water-binder ratio reaches between 0.4-0.45%, and the freeze-resistant highland concrete is obtained.

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