CN111792885A

CN111792885A - High-workability environment-friendly pumping concrete

Info

Publication number: CN111792885A
Application number: CN202010687718.8A
Authority: CN
Inventors: 袁国峰
Original assignee: Shaanxi Hongqi Huishi Construction Products Co ltd
Current assignee: Shaanxi Hongqi Huishi Construction Products Co ltd
Priority date: 2020-07-16
Filing date: 2020-07-16
Publication date: 2020-10-20

Abstract

The invention relates to high-workability environment-friendly pumping concrete, which belongs to the technical field of building materials and comprises the following components in parts by weight: 300 parts of cement, 120 parts of fly ash, 140 parts of crushed stone, 1000 parts of machine-made sand, 380 parts of machine-made sand, 580 parts of stone powder, 160 parts of water, 60-80 parts of mineral powder and 14-18 parts of pumping agent; the pumping agent comprises the following components in parts by weight: 4-5 parts of polyester polycarboxylic acid water reducing agent, 6-9 parts of polyether polycarboxylic acid water reducing agent, 2-4 parts of air entraining agent and 1-2 parts of sodium gluconate retarder; the weight percentage of the waste water in the water is 0-50 percent, and the rest is tap water. The invention has the effect of high workability.

Description

High-workability environment-friendly pumping concrete

Technical Field

The invention relates to the technical field of building materials, in particular to environment-friendly pumping concrete with high workability.

Background

Concrete is one of the most important civil engineering materials in the present generation, and is an artificial stone material prepared by mixing a cementing material, granular aggregate (also called aggregate), water, and optionally an additive and an admixture according to a certain proportion, uniformly stirring, densely forming, curing and hardening, and the concrete is widely used in the construction industry.

Along with the high-speed development of the construction industry, the consumption of concrete is larger and larger, natural sand resources are more and more tense, the problem of serious environmental pollution caused by random mining and random excavation of the natural sand resources is solved, and the mechanical sand is used for replacing the natural sand as the concrete fine aggregate, so that the environmental pollution caused by random mining and random excavation of the natural sand resources can be effectively reduced; in addition, a large amount of fly ash is discharged every year by coal-fired thermal power plants in China, the fly ash is continuously accumulated, large-area land is occupied, environmental pollution is caused, the ecological environment is destroyed, and the fly ash serving as an admixture is applied to concrete engineering and meets the requirements of green environment-friendly concrete.

The machine-made sand is used as fine aggregate, the fly ash is used as admixture to be applied to the concrete engineering to produce green environment-friendly concrete, which is beneficial to the environmental protection career of China, but the edges and corners and the shape of machine-made sand particles are irregular, a plurality of needle sheet-shaped particles are contained, the machine-made sand particles are mutually occluded, and the flow resistance is large, so that the mixed concrete has poor workability, is easy to generate segregation, and is not beneficial to the pumping and the subsequent utilization of the concrete.

Disclosure of Invention

In view of the defects of the prior art, the first purpose of the invention is to provide environment-friendly pumping concrete with high workability, which has the advantage of high workability.

In order to achieve the purpose, the invention provides the following technical scheme: the environment-friendly pumping concrete with high workability comprises the following components in parts by weight: 300 parts of cement, 120 parts of fly ash, 140 parts of crushed stone, 1000 parts of machine-made sand, 380 parts of machine-made sand, 580 parts of stone powder, 160 parts of water, 60-80 parts of mineral powder and 14-18 parts of pumping agent;

the pumping agent comprises the following components in parts by weight: 4-5 parts of polyester polycarboxylic acid water reducing agent, 6-9 parts of polyether polycarboxylic acid water reducing agent, 2-4 parts of air entraining agent and 1-2 parts of sodium gluconate retarder;

the weight percentage of the waste water in the water is 0-50 percent, and the rest is tap water.

By adopting the technical scheme, the workability of the concrete is limited by three factors of fluidity, cohesiveness and water-retaining property. Machine-made sand is used for replacing natural sand as fine aggregate, so that the environmental problem caused by the exploitation of a large amount of natural sand is reduced,the fly ash is used as an admixture for concrete, so that the pollution of the fly ash to the environment is reduced, the environment-friendly concrete is in line with the idea of green environment-friendly concrete, the main mineral compositions of the fly ash are aluminosilicate glass beads and sponge bodies, the spherical glass bodies are similar to glass balls, the texture is compact, the surface is smooth, the granularity is fine, the internal specific surface area is small, the adsorption force to water is small, the fluidity is good, the fly ash plays a role of a ball bearing in a concrete mixture, the friction among cement particles and between the cement particles and aggregate can be reduced, the flow resistance is reduced, the fluidity of the concrete is improved, and the pumpability of the concrete is improved; SiO in fly ash₂And Al₂O₃The calcium silicate hydrate and the aluminum silicate hydrate are filled in the pores of the cement hydrate to reduce the internal porosity of the concrete, so that the pore diameter is refined, the pore structure is improved, and the bonding effect of each component of the concrete is improved; meanwhile, due to the hydrophilic characteristic of the particle form of the fly ash, the spherical glass can absorb a layer of water film, so that the water retention of the concrete is enhanced.

The source of the waste water is mainly the washing of concrete mixers, pump trucks, tank trucks and the like, the main components (ions) in the waste water are from aggregates, additives and cement, the pH value of the waste water is high and can reach about 12, if the waste water is directly discharged into the environment, the environment can be polluted, and in addition, the tank trucks are washed by using clean water, which is not a small waste. Assuming that 1-2T water is used for flushing a tank car for 2-3 times a day, and taking 20 vehicles used by a medium-scale mixing plant for example, the clear water is used for 40-120T a day, so that the reuse of the waste water is very beneficial to the environmental protection and the water resource saving; hydration of cement to Ca (OH)₂So that the concrete is alkaline, the PH value is more than 12, a layer of stable, compact and passivated protective film is generated on the surface of the steel bar in the concrete, the steel bar is not rusted, and when CO in the environment₂Into concrete, with Ca (OH) in concrete₂Reaction to produce CaCO₃The alkalinity of the concrete is reduced or even disappears, and the reaction is concrete carbonization to generate CaCO₃The substances can damage the protective film on the surface of the steel bar, so that the steel bar is easy to rust,the wastewater has a higher pH value, the pH value in the concrete can be improved by adding the wastewater into the concrete, the alkalinity of the concrete is enhanced, the carbonization of the concrete is slowed down, and the durability of the concrete is favorably improved.

The addition of the stone powder increases the slurry content in the mixture, overcomes the defects of mechanism sand edge and rough surface, the stone powder also plays the role of micro balls, reduces the friction between sand and sand to improve the workability of concrete, the stone powder particles can increase the compactness of the set cement, reduce interfacial bleeding, effectively accumulate to densify a transition region, improve the structure of a 'transition layer in a secondary central region', increase the impermeability and reduce the deformability.

The cement can form a flocculation structure in the hydration process, free water is wrapped, the workability of the cement is reduced, the molecules of the doped polycarboxylic acid water reducing agent are adsorbed on the surface of the flocculation structure, the whole flocculation structure is charged like the charges due to the ionization of polar hydrophilic groups, and flocculation particles are mutually repelled due to the same charges, so that the flocculation structure is damaged, the wrapped free water is released, the consistency of slurry is reduced, and the fluidity of concrete mixtures is improved; the polyether water reducer has the main advantages of high water reducing rate, larger adaptability difference to different cements, higher sensitivity to mixing amount and generally poor workability wrapping property, and has the greatest advantages of good adaptability, good applicability to various cements, insensitivity to mixing amount, good workability of prepared concrete wrapping property, and capability of improving the adaptability while ensuring the water reducing amount by matching the two types of water reducers, thereby being beneficial to enhancing the workability of concrete.

The surface tension of a liquid phase can be reduced by doping the air entraining agent, so that gas is easily introduced into the concrete in the stirring process, bubbles are formed in the concrete, a large number of introduced bubbles can generate a ball effect, the friction force among aggregate particles is reduced, and the fluidity is improved.

Setting of cementDepending on a network structure formed by cross lapping of reactants after cement hydration, in the initial stage of cement hydration, under the strong dispersion action of the polycarboxylic acid water reducing agent, the wetting capacity of the solution to the particles is enhanced, the hydration active points of the particles are increased, and the cement hydration is promoted to generate Ca²⁺Simultaneously, sodium gluconate and part of water reducing agent molecules can be mixed with Ca²⁺Form a complex of Ca²⁺The concentration is reduced, and the dissolution and the separation of SO from the gypsum in the cement are accelerated₄ ^2-，Ca(OH)₂Can not reach its saturation degree rapidly, thereby inhibiting Ca (OH)₂On the other hand, hydroxyl in sodium gluconate molecules can enable the surfaces of cement particles to form more stable solvated water films, so that contact points among the particles are reduced, more free water is left in cement slurry, agglomeration among hydration products is hindered, bridging among the particles is weakened, the cement hydration speed is more effectively inhibited, the setting time is prolonged, the retention time of the working performance of a mixture is prolonged, and the pumpability of concrete is improved; the introduction of the sodium gluconate can improve the dispersing performance of the polycarboxylate superplasticizer, promote the hydration of early cement, and simultaneously, the adsorption and complexation of the sodium gluconate can ensure that the hydration product grows up uniformly, the structure is more compact, and the improvement of the concrete strength is facilitated.

The invention is further configured to: the water reducing agent is subjected to anti-mud treatment.

The treatment method comprises the steps of adding 8-12 parts of the anti-mud agent into the polycarboxylic acid water reducing agent, and uniformly mixing.

By adopting the technical scheme, a certain amount of soil can be contained in the broken stones and the machine-made sand, when the mud content in a concrete system is higher, the polycarboxylate superplasticizer shows the phenomena of insufficient water reducing rate, large slump loss and the like, because some aluminosilicate can be generated in the cement hydration process, the molecular side chain of the polycarboxylate superplasticizer is embedded into the interlayer of the aluminosilicate, the interlayer spacing of the aluminosilicate is increased, the clay adsorbs polycarboxylate superplasticizer molecules, the content of the effective polycarboxylate superplasticizer with dispersion effect is reduced, and the solid phase volume and the liquid phase volume in the concrete mixture are increased and reduced due to the volume expansion after the clay adsorbs water, the working performance of the concrete mixture is finally deteriorated, the anti-mud agent is added into the polycarboxylate superplasticizer, the anti-mud agent can reduce the adsorption of the clay to the polycarboxylate superplasticizer, so that the content of the effective polycarboxylate superplasticizer is increased, the performance of the polycarboxylic acid water reducing agent is improved.

The invention is further configured to: the synthetic method of the anti-mud agent comprises the following steps:

adding 2-3 parts of polyethylene glycol, 4-6 parts of beta-cyclodextrin and 2-3 parts of dimethyl diallyl ammonium chloride into a beaker, adding 20-30 parts of water, and uniformly stirring to obtain the anti-mud agent.

By adopting the technical scheme, the polyethylene glycol with small molecular weight can enter the aluminosilicate layers and be adsorbed by clay, the adsorption rate of the polyethylene glycol is far greater than that of the clay to the polycarboxylic acid water reducing agent, and the adsorption of the clay to the polycarboxylic acid water reducing agent is reduced; the beta-cyclodextrin has a good complexing function on clay, can reduce the adsorption effect of high-valence metal ions in the clay on the polycarboxylic acid water reducing agent, and retains more effective polycarboxylic acid molecules; the dimethyl diallyl ammonium chloride can effectively reduce the volume expansion and water absorption of the clay, and reduce the specific surface area and the internal space of the clay, thereby reducing the adsorption of the clay to the polycarboxylic acid water reducing agent, effectively preventing the increase of the solid phase volume in the concrete, achieving the purpose of improving the working performance of the concrete, and being beneficial to improving the strength of the concrete.

The invention is further configured to: the stone powder is limestone powder.

By adopting the technical scheme, the limestone powder has higher specific surface area, can fully fill the gaps of the concrete, reduce the porosity of the concrete, enhance the impermeability of the concrete and reduce CO in the environment₂Enter the interior of concrete to improve the anti-carbonization capability of the concrete, and the CaC0 in limestone powder₃The calcium aluminate hydrate is generated by cement hydration reaction, which has the reinforcing effect on cement hydration, so that the concrete strength is improved while the workability is improved.

The invention is further configured to: the machine-made sand is subjected to hydrophobic treatment, and the treatment method comprises the following steps:

s1, dissolving sodium methylsiliconate in water to prepare a sodium methylsiliconate solution with the weight percentage of 0.1-0.5%, then adding cement into the sodium methylsiliconate solution to enable the weight percentage of the cement to be 10-30%, and uniformly stirring to obtain an impregnation solution;

s2, putting the machine-made sand into an impregnating solution, so that the impregnating solution submerges the machine-made sand, and impregnating for 3-4 seconds;

and S3, airing the machine-made sand soaked in the S2 at room temperature.

By adopting the technical scheme, the water absorption rate of the aggregate is an important physical index, the water absorption rate of the aggregate directly influences the quantity of free water in the concrete mixture, the aggregate with higher water absorption rate can absorb the free water in the concrete mixture into the aggregate to cause the reduction of the free water in the mixture, the fluidity is reduced, the loss of slump over time is increased, the surface of the machine-made sand is rougher, the water absorption rate of the surface of the machine-made sand is increased, after the hydrophobic treatment is carried out on the machine-made sand, the absorption of the machine-made sand on the free water in the concrete mixture can be reduced, the free water quantity in the concrete mixture is increased, the fluidity of the concrete is improved, the water absorption rate of the machine-made sand is reduced, the water on the surface of the machine-made sand is reduced, the water content between a cement hydration product and the machine-made sand is reduced, and the pores generated by the increase of water between the cement hydration product and the machine-made sand are reduced, the internal porosity of the concrete is reduced, and the strength and the anti-carbonization capability of the concrete are improved.

The invention is further configured to: the macadam comprises large stones and small stones with the weight ratio of 1 (1-2), wherein the particle size of the large stones is 12-20mm, and the particle size of the small stones is 6-9 mm.

By adopting the technical scheme, the slurry required for filling the gap is directly influenced by the fluctuation of the void ratio of the aggregates, the void ratio among the aggregates is large, the slurry for filling the gap among the aggregates is increased, the slurry wrapped on the surfaces of the aggregate particles and playing a role in lubrication is reduced, the slurry wrapped on the surfaces of the aggregate particles is thinned under the condition of certain slurry, the friction force among the aggregate particles is increased, the fluidity of a concrete mixture is deteriorated, the cohesiveness is reduced, the coarse aggregate of the crushed stones is discontinuously graded, small stones are fully filled among the gaps of the large stone particles, the void ratio is reduced, the slurry filled among the crushed stones is reduced, more slurry is wrapped on the surfaces of the crushed stones and machine-made sand, the friction force among the aggregates is reduced, the concrete fluidity is favorably improved, and the reduction of the void ratio is favorable for improving the strength and the anti-carbonization.

The invention is further configured to: the coating also comprises 33-42 parts of an exciting agent by weight.

By adopting the technical scheme, the fly ash used as a gelling component applied to concrete can cause the problem of low early strength of the concrete, because cement firstly undergoes hydration reaction in the early stage, only 10-20% of the fly ash participates in the reaction at the moment, the cement is the main component for providing strength in the concrete, the fly ash replaces the cement component in the concrete, the content of the cement in the concrete is diluted, the early strength of the concrete is low, and the other reason is that the chemical component Al in the fly ash glass body is the internal chemical component of the fly ash glass body₂O₃And SiO₂The activity of the fly ash is stable and the fly ash is usually reacted after 14d of concrete casting, so that the activity of the fly ash is not easy to be excited, the early strength of the concrete is lower, the activity of the fly ash can be excited by adding the exciting agent, the hydration reaction of the fly ash is accelerated, and the early strength of the concrete is improved.

The invention is further configured to: the excitant comprises the following components in parts by weight: 3-6 parts of anhydrous sodium sulfate and 30-36 parts of hydrated lime powder.

By adopting the technical scheme, hydration reaction occurs in the cement to generate Ca (OH)₂The surface of the fly ash glass body has a large amount of weakly acidic oxides, Ca (OH)₂The ionized OH-destroys Si-O, Al-O bond on the surface of the glass body, and under the action of OH, the network structure formed by Al-O-Al, Si-O-Si, Si-O-Al and other bonds is destroyed, so that the active SiO in the fly ash particles₂And Al₂O₃Dissolution with Ca (OH)₂Reaction, adding hydrated lime to supplement OH-concentration and promote the destruction of the surface network structure of fly ash glass body, and adding hydrated lime powder to supplement Ca²⁺，Ca²⁺And SO ionized by anhydrous sodium sulfate₄ ^2-With Al₂O₃Dissolved in liquid phaseGenerated AlO^2-Hydration reaction to generate ettringite, hydration to generate a great amount of needle-rod-shaped ettringite which is criss-cross and is lapped into a fluffy and porous network structure, Ca²⁺Pass through the gaps of the network structure to enter the inside of the fly ash particles and are mixed with high-activity SiO₂And Al₂O₃The reaction is carried out, so that the early activity of the fly ash is excited, the excitation reaction is continuously carried out in the later stage, the final reaction participation amount of the fly ash is increased, the early and later strength of the concrete can be improved, and the machine-made sand concrete mixture doped with the anhydrous sodium sulfate and hydrated lime powder composite exciting agent has better cohesiveness and water retention property, and meets the requirement of pumping concrete.

In conclusion, the beneficial technical effects of the invention are as follows:

1. according to the pumping aid, the polycarboxylate superplasticizer is compounded with the sodium gluconate, so that the pumpability of concrete is improved, and the strength of the concrete is enhanced;

2. the polycarboxylate superplasticizer is subjected to anti-mud treatment, so that the water reducing performance of the polycarboxylate superplasticizer is improved;

3. the machine-made sand is subjected to hydrophobic treatment, so that the water absorption of the machine-made sand is reduced, and the fluidity of concrete is favorably improved.

Detailed Description

The present application will be described in further detail with reference to examples.

The starting materials used in the examples are all commercially available:

the cement is obtained from Shijiazhuang Shangjiu trade company, Ltd, by adopting P.O.42.5 ordinary portland cement;

the fly ash is purchased from a Lingshou county Taiyue mineral processing factory by adopting a II-grade fly ash product number 12;

crushed stone (12-20mm) goods number KX-SS was purchased from Hebeike Asahi building materials Co., Ltd, and crushed stone (6-9mm) goods number KX-SS was purchased from Hebeike Asahi building materials Co., Ltd;

the machine-made sand cargo number 6987 was purchased from the Lingshou county Zhenhe river ore product processing plant;

limestone powder product number 6 was purchased from Shijiazhuang Xibang mineral products, Inc.; granite stone powder product number 2 was purchased from Shijiazhuang Xibang mineral products, Inc.;

the wastewater comes from a concrete mixing plant, and the density of the wastewater is 1.302-1.060g/cm³；

The mineral powder is purchased from a processing plant for Hongsheng mineral products in Lingshou county by adopting S95 level mineral powder cargo number slag powder 1;

the polyester polycarboxylic acid water reducing agent is purchased from Shandong Tongsheng building materials Co., Ltd, and the polyether polycarboxylic acid water reducing agent is purchased from Shandong Tongsheng building materials Co., Ltd;

the triterpene saponin air entraining agent has a product number sc purchased from deep-invasive chemical company Limited in Guangzhou city;

sodium gluconate retarder product number 1 was purchased from Shijiazhuang Doubo chemical Co., Ltd;

the citric acid retarder good number HY-HN01 was purchased from Beijing sea rock construction concrete admixture sales Co., Ltd;

polyethylene glycol cat No. 6466 was purchased from haian petrochemical plants in Jiangsu province;

beta-cyclodextrin cat No. 3434 was purchased from shanghai gawaring chemical ltd;

dimethyldiallylammonium chloride cat # knono 7398-69-8 was purchased from jonan knono new materials, inc;

anhydrous sodium sulfate cat No. 9 was purchased from shandongteng sharpeners ltd;

the calcined lime powder product 001 is purchased from Huatong calcium industry Co., Ltd.

Example 1

The environment-friendly pumping concrete with high workability is obtained by the following method: 250kg of cement, 140kg of fly ash, 900kg of broken stone, 400kg of machine-made sand, 540kg of limestone powder, 160kg of tap water, 80kg of mineral powder, 4kg of polyester polycarboxylic acid water reducing agent, 9kg of polyether polycarboxylic acid water reducing agent, 2kg of air entraining agent and 2kg of sodium gluconate retarder are uniformly mixed.

360kg of large stones (12-20mm) and 540kg of small stones (6-9mm) in the crushed stones.

Example 2

The environment-friendly pumping concrete with high workability is obtained by the following method: 275kg of cement, 130kg of fly ash, 950kg of broken stone, 390kg of machine-made sand, 560kg of limestone powder, 135kg of tap water, 45kg of wastewater, 70kg of mineral powder, 4.5kg of polyester polycarboxylic acid water reducing agent, 7.5kg of polyether polycarboxylic acid water reducing agent, 3kg of air entraining agent and 1.5kg of sodium gluconate retarder are uniformly mixed.

380kg of large stones (12-20mm) and 570kg of small stones (6-9mm) in the crushed stones.

Example 3

The environment-friendly pumping concrete with high workability is obtained by the following method: 300kg of cement, 140kg of fly ash, 1000kg of broken stone, 400kg of machine-made sand, 580kg of limestone powder, 100kg of tap water, 100kg of wastewater, 80kg of mineral powder, 5kg of polyester polycarboxylic acid water reducing agent, 9kg of polyether polycarboxylic acid water reducing agent, 4kg of air entraining agent and 2kg of sodium gluconate retarder are uniformly mixed.

400kg of large stones (12-20mm) and 600kg of small stones (6-9mm) in the crushed stones.

Example 4

Different from the embodiment 2, the polyester type polycarboxylate water reducer and the polyether type polycarboxylate water reducer are subjected to the following mud resistance treatment:

s1, adding 2kg of polyethylene glycol, 4kg of beta-cyclodextrin and 2kg of dimethyl diallyl ammonium chloride into a stirring tank, adding 20kg of water, and uniformly stirring to obtain an anti-mud agent;

s2, adding 4.5kg of polyester polycarboxylic acid water reducing agent and 7.5kg of polyether polycarboxylic acid water reducing agent into the anti-mud agent prepared in the S1, and uniformly mixing.

Example 5

s1, adding 2.5kg of polyethylene glycol, 5kg of beta-cyclodextrin and 2.5kg of potassium chloride into a stirring tank, adding 25kg of water, and uniformly stirring to obtain an anti-mud agent;

Example 6

s1, adding 3kg of polyethylene glycol, 6kg of beta-cyclodextrin and 3kg of potassium chloride into a stirring tank, adding 30kg of water, and uniformly stirring to obtain an anti-mud agent;

Example 7

In contrast to example 5, the machine-made sand was subjected to the following water-repellent treatment:

s1, dissolving sodium methylsiliconate in water to prepare a sodium methylsiliconate solution with the weight percentage of 0.1%, then adding cement into the sodium methylsiliconate solution to enable the weight percentage of the cement to be 10%, and uniformly stirring to obtain an impregnation solution;

s2, putting the machine-made sand into an impregnating solution, so that the impregnating solution submerges the machine-made sand, and impregnating for 3 seconds;

and S3, airing the steel machine-made sand dipped in the S2 at room temperature.

Example 8

s1, dissolving sodium methylsiliconate in water to prepare a sodium methylsiliconate solution with the weight percentage of 0.3%, then adding cement into the sodium methylsiliconate solution to enable the weight percentage of the cement to be 20%, and uniformly stirring to obtain an impregnation solution;

s2, putting the machine-made sand into an impregnating solution, so that the impregnating solution submerges the machine-made sand, and impregnating for 3.5 seconds;

Example 9

s1, dissolving sodium methylsiliconate in water to prepare a sodium methylsiliconate solution with the weight percentage of 0.5%, then adding cement into the sodium methylsiliconate solution to enable the weight percentage of the cement to be 30%, and uniformly stirring to obtain an impregnation solution;

s2, putting the machine-made sand into an impregnating solution, so that the impregnating solution submerges the machine-made sand, and impregnating for 4 seconds;

Example 10

The difference from example 8 is: 316kg of large stones (12-20mm) in the crushed stones and 634kg of small stones (6-9 mm);

example 11

The difference from example 8 is: 475kg of medium and large stones (12-20mm) and 475kg of small stones (6-9 mm);

example 12

The difference from example 8 is: the environment-friendly pumping concrete with high workability also comprises an excitant consisting of 3kg of anhydrous sodium sulfate and 30kg of hydrated lime powder.

Example 13

The difference from example 8 is: the environment-friendly pumping concrete with high workability also comprises an excitant consisting of 4.5kg of anhydrous sodium sulfate and 33kg of hydrated lime powder.

Example 14

The difference from example 8 is: the environment-friendly pumping concrete with high workability also comprises an excitant consisting of 6kg of anhydrous sodium sulfate and 36kg of hydrated lime powder.

Comparative example 1

Concrete comparative example 2 with goods number of Saili DX in Germany Hangao Baide chemical special shop

The difference from example 13 is: 7.5kg of polyether polycarboxylic acid water reducing agent is replaced by 7.5kg of polyester polycarboxylic acid water reducing agent.

Comparative example 3

The difference from example 13 is: 4.5kg of polyester polycarboxylic acid water reducing agent is replaced by 4.5kg of polyether polycarboxylic acid water reducing agent.

Comparative example 4

The difference from example 13 is: 12kg of cement is used for replacing 7.5kg of polyether polycarboxylic acid water reducing agent and 4.5kg of polyester polycarboxylic acid water reducing agent

Comparative example 5

The difference from example 13 is: 1.5kg of sodium gluconate coagulant is replaced by 1.5kg of citric acid retarder.

Comparative example 6

The difference from example 13 is: 1.5kg of sodium gluconate coagulant is replaced by 1.5kg of cement

Comparative example 7

The difference from example 13 is: 560kg of limestone powder is replaced by 560kg of granite powder.

Comparative example 8

The difference from example 13 is: 560kg of limestone powder is replaced by 560kg of cement.

Performance detection

Measuring the 28d compressive strength of the concrete according to the test standard of the mechanical property method of the common concrete GB/T50081-2002;

measuring the carbonization depths of concrete 3d, 7d, 14d and 28d according to the test method standard GB/T50082-2009 for the long-term performance and the durability of common concrete;

according to the standard of the Performance test method of common concrete mixtures GB/T50080-2016, the slump and the slump expansion of the concrete mixtures are measured, and the larger the slump, the larger the fluidity of the concrete mixtures is;

when the slump test is carried out, more water is analyzed to obtain 'more' after the slump cone is lifted; small amount of water can be analyzed to obtain 'small amount'; no water was analyzed, "none"; when the mixture is gradually sunk, the cohesiveness is good, and when the cone collapses suddenly and is partially cracked or stones are separated, the cohesiveness is not good.

TABLE 1 Performance test results

As can be seen from Table 1, according to the experimental data of comparative examples 1-14 and comparative example 1, the slump constant and the slump expansion of the concrete obtained in examples 1-14 are better than those of comparative example 1, the cohesiveness and the water retention of the concrete obtained in examples 1-14 are also better than those of the concrete obtained in comparative example 1 and examples 1-14, the strength of the concrete obtained in examples 1-14 is better than that of comparative example 1, the carbonization depth and the carbonization rate of the concrete obtained in examples 1-14 are better than those of comparative example 1, and the carbonization resistance of the concrete obtained in examples 1-14 is better, so that the concrete of the application achieves better workability, ensures the strength of the concrete and has better carbonization resistance.

The concrete prepared in the examples 1 to 3 has better workability, wherein the concrete prepared in the example 2 has the best workability, the concrete prepared in the example 1 has the best carbonization resistance, the addition of the waste water is beneficial to improving the carbonization resistance of the concrete, and the component ratio of the concrete prepared in the example 2 is better.

Compared with the experimental data of the comparative example 2 and the comparative examples 2 to 4, the concrete prepared by adding the polycarboxylate superplasticizer has higher workability, and the concrete prepared by compounding the polyether polycarboxylate superplasticizer and the polyester polycarboxylate superplasticizer has better workability.

Experimental data of comparative examples and comparative examples 5-6 show that the concrete prepared by adding the retarder has higher workability, and the concrete prepared by compounding the sodium gluconate retarder and the polycarboxylic acid water reducing agent has better workability.

Compared with the experimental data of the comparative example 2 and the comparative examples 7 to 8, the addition of the limestone powder into the concrete is beneficial to improving the workability of the concrete, the workability of the concrete prepared by adding the limestone powder is better, and the strength and the carbonization resistance of the concrete prepared by the example 2 are better.

The experimental data of comparative example 2 and examples 4-6 show that the concrete prepared by the water reducing agent after anti-mud treatment has higher workability, the anti-mud treatment method of example 5 has better effect, and the concrete prepared by examples 4-6 has better strength and anti-carbonization capability.

Comparing the experimental data of example 5 and examples 7-9, it is found that the workability, strength and carbonization resistance of the concrete prepared in examples 7-9 are better than those of the concrete prepared in example 5, which indicates that the concrete prepared by hydrophobing the machine-made sand is better in performance and the hydrophobing method of example 8 is optimal.

Comparing example 8 and examples 10-11, the experimental data show that the proportion by weight of the large stones (40-80mm) and the small stones (5-20mm) in the macadam is 1 (1-2), the prepared concrete has better workability, strength and anti-carbonization capability, and the proportion by weight of the large stones (40-80mm) and the small stones (5-20mm) in the macadam is 1:1.5, so that the prepared concrete has better performance.

The experimental data of comparative example 8 and examples 12 to 14 show that the addition of the activator to the concrete has little influence on the workability of the concrete, but the addition of the activator can improve the strength of the concrete and enhance the performance of the concrete, and the activator of example 13 has better proportioning effect.

The above-mentioned embodiments are merely illustrative and not restrictive, and those skilled in the art can modify the embodiments without inventive contribution as required after reading this specification, but only fall within the scope of the claims of the present invention.

Claims

1. The environment-friendly pumping concrete with high workability is characterized in that: the paint comprises the following components in parts by weight: 300 parts of cement, 120 parts of fly ash, 140 parts of crushed stone, 1000 parts of machine-made sand, 380 parts of machine-made sand, 580 parts of stone powder, 160 parts of water, 60-80 parts of mineral powder and 14-18 parts of pumping agent;

2. The environment-friendly pumping concrete with high workability according to claim 1, wherein: the water reducing agent is subjected to anti-mud treatment,

3. The environment-friendly pumping concrete with high workability according to claim 2, wherein: the synthetic method of the anti-mud agent comprises the following steps:

adding 2-3 parts of polyethylene glycol, 4-6 parts of beta-cyclodextrin and 2-3 parts of dimethyl diallyl ammonium chloride into a stirring tank, adding 20-30 parts of water, and uniformly stirring to obtain the anti-mud agent.

4. The environment-friendly pumping concrete with high workability according to claim 1, wherein: the stone powder is limestone powder.

5. The environment-friendly pumping concrete with high workability according to claim 1, wherein: the machine-made sand is subjected to hydrophobic treatment, and the treatment method comprises the following steps:

and S3, airing the machine-made sand soaked in the S2 at room temperature.

6. The environment-friendly pumping concrete with high workability according to claim 1, wherein: the macadam comprises large stones and small stones with the weight ratio of 1 (1-2), wherein the particle size of the large stones is 12-20mm, and the particle size of the small stones is 6-9 mm.

7. The environment-friendly pumping concrete with high workability according to claim 1, wherein: the coating also comprises 33-42 parts of an exciting agent by weight.

8. The environment-friendly pumping concrete with high workability according to claim 7, wherein: the excitant comprises the following components in parts by weight: 3-6 parts of anhydrous sodium sulfate and 30-36 parts of hydrated lime powder.