Remaining slurry circulating formula

Abstract

The invention relates to the technical field of concrete product production, in particular to a residual slurry circulation formula, which comprises the following components by weight: 350-450kg / m < 3 > of cement; sand grains are 750-800 kg / m < 3 >; stone blocks are 900-1000 kg / m < 3 >; the residual slurry is 200-300kg / m < 3 >; 8.5-10.5 kg / m < 3 > of a water reducing agent; 80-85 kg / m < 3 > of water; and 20-25 kg / m < 3 > of an enhancer. According to the prepared residual slurry circulation formula, the residual slurry is mixed with new cement, active substances in the cement are supplemented, then sand grains and stones are added as aggregates and fill gaps, and sodium gluconate and silica fume are used in a matched mode, so that the water consumption is reduced, meanwhile, the mechanical strength of the recycled residual slurry after solidification is improved, and the service life of the residual slurry is prolonged. The residual slurry can be cyclically put into the production process, and the method has the beneficial effects of being environment-friendly and reducing the production cost.

Description

Technical Field

[0001] The present invention relates to the technical field of concrete product production, and particularly relates to a recycled slurry formula. Background Art

[0002] With the increasing number of power projects, the production of electric poles has also increased. In the production process of electric poles, it is necessary to prepare concrete piles. However, after the existing electric poles are manufactured, a lot of surplus slurry is often generated. This surplus slurry is generally the waste liquid that flows out during the pouring process after the production of the electric pole pipe piles. The main components of the surplus slurry are cement, water, water reducing agent, etc. Currently, due to the risk of environmental pollution caused by the surplus slurry, the disposal of the surplus slurry is a major problem encountered in the production process of electric poles.

[0003] In the prior art, the process of recycling surplus slurry is as follows: after the production of the pipe pile is completed, the crane grabs the pipe pile and pours the surplus slurry into the surplus slurry bucket. After the surplus slurry bucket collects a certain amount of surplus slurry, the surplus slurry is then homogenized by adding water. After homogenizing to a certain concentration, the homogenized surplus slurry is pumped out through a pipeline to the aggregate bucket for storage and standby. However, the concentration of the surplus slurry collected multiple times in the prior art varies greatly, and it is easy to precipitate and accumulate at the bottom of the surplus slurry bucket, causing blockage of the transportation pipeline.

[0004] Therefore, there is a need for a recycled slurry formula that can solve the problem of surplus slurry precipitation. Summary of the Invention

[0005] The main purpose of the present invention is to provide a recycled slurry formula, aiming to solve the problem of easy precipitation and accumulation of surplus slurry in the prior art.

[0006] To achieve the above object, the present invention provides a recycled slurry formula, which is calculated by weight as follows:

[0007] Cement: 350 - 450 kg / m 3 ;

[0008] Sand grains: 750 - 800 kg / m 3 ;

[0009] Stone blocks: 900 - 1000 kg / m 3 ;

[0010] Surplus slurry: 200 - 300 kg / m 3 ;

[0011] Water reducing agent: 8.5 - 10.5 kg / m 3 ;

[0012] Water: 80 - 85 kg / m 3 ;

[0013] Enhancing agent: 20 - 25 kg / m 3。

[0014] Further, the water reducing agent is sodium gluconate.

[0015] Further, the cement is one or more of composite Portland cement P.C32.5, P.C42.5, ordinary Portland cement P.O32.5, P.O42.5, Portland cement P.II42.5, and P.II52.5.

[0016] Further, the strength enhancer is silica fume.

[0017] Further, the particle size of the stone is 5 - 40 mm, and the particle size of the sand is 0.075 - 10 mm.

[0018] Further, the surplus slurry is one or more of C20, C25, C30, C35, C40, C45, and C50.

[0019] In the present invention, by mixing the surplus slurry with new cement to supplement the active substances in the cement, adding sand and stones as aggregates to fill the gaps, and using sodium gluconate and silica fume in combination, while reducing the water consumption, the mechanical strength of the recycled surplus slurry after solidification is improved. The present invention enables the surplus slurry to be recycled into the production process, having the beneficial effects of environmental friendliness and reducing production costs. Detailed Embodiments

[0020] Next, in combination with the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the protection scope of the present invention.

[0021] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative position relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0022] In addition, the descriptions involving "first", "second", etc. in the present invention are for descriptive purposes only, and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments may be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0023] It can be understood that water reducing agents can increase the fluidity and workability of concrete by reducing the amount of cement in the concrete, reduce the viscosity of the cement structure, and cannot effectively control the setting time of the concrete and the formation of concrete strength. However, they can keep the workability of cement paste, mortar, and concrete unchanged while significantly reducing their mixing water consumption, significantly increasing the concrete strength, improving the frost resistance and impermeability of the concrete, or reducing the amount of cement. Retarders control the setting process of the concrete and help the cement particles form a more compact structure on the basis of the original cement.

[0024] The main components of the cement slurry are silicate colloids, containing unreacted cement, water, and other minerals, among which there is unreacted cement slurry. During the recycling process, the surplus slurry is mixed with new cement, sand, gravel, and other additives in a certain proportion, enabling the reuse of the surplus slurry.

[0025] In the present invention, sand grains play a role in filling voids, improving the workability and strength of the concrete. Stones, as aggregates, provide structural support, increasing the strength and durability of the concrete. The main component of silica fume is silicon dioxide, which can react with the active components in the cement. In the cement, it can react with calcium carbonate to form calcium silicate colloid, that is, by generating more cementitious substances to fill the micro voids in the concrete, improving its density and compressive strength, thereby enhancing the strength and durability of the concrete. In the present invention, sodium gluconate is in powder form. Sodium gluconate can act as a retarder and a water reducing agent in the surplus slurry recycling. Among them, when sodium gluconate acts as a retarder, it can significantly delay the initial setting and final setting times of the cement concrete, extend the workable time of the concrete, ensure that the surplus slurry maintains good fluidity during the recycling process, avoid premature setting, improve the utilization rate of the surplus slurry. At the same time, sodium gluconate has a water reducing effect, which can reduce the water-cement ratio (W / C) of the concrete, thereby increasing the strength and durability of the concrete, reducing the water consumption, improving the fluidity and compactness of the surplus slurry, and simultaneously enhancing the final strength of the concrete.

[0026] The present invention also discloses specific application examples 1-3 and the recycled surplus slurry of comparative examples 1-2 using the prior art, and the recycled surplus slurry is re-prepared into cement concrete, and then performance comparison experiments are carried out on the cement concrete, as follows:

[0027] Example 1:

[0028] Raw materials:

[0029] 1. Cement 390 kg / m 3 ;

[0030] 2. Sand grains 790 kg / m 3 ;

[0031] 3. Stones 970 kg / m 3 ;

[0032] 4. Surplus slurry 200 kg / m 3 ;

[0033] 5. Water reducing agent 8.5 kg / m 3 ;

[0034] 6. Water 80 kg / m 3 ;

[0035] 7. Silica fume 20 kg / m 3 .

[0036] Preparation steps:

[0037] S1. Weigh each component of the raw materials according to the mass ratio, and then place each component of the raw materials separately for standby;

[0038] S2. Feed the cement, sand grains, stones and silica fume into a stirring reaction tank for mixing;

[0039] S3. Add the water reducing agent and water to the stirring reaction tank in batches and stir until the mixture is uniform;

[0040] S4. Use a thermometer and a hygrometer to adjust the ratio of water, sand grains or stones in the construction environment on site to obtain reusable surplus slurry;

[0041] S5. After recycling the surplus slurry, pump it back into the pipe pile capping mold to produce and prepare pole concrete.

[0042] Example 2:

[0043] Raw materials:

[0044] 1. Cement 420 kg / m 3 ;

[0045] 2. Sand grains 760 kg / m 3 ;

[0046] 3. Stone: 940 kg / m 3 ;

[0047] 4. Surplus slurry: 240 kg / m 3 ;

[0048] 5. Water reducing agent: 9.6 kg / m 3 ;

[0049] 6. Water: 81 kg / m 3 ;

[0050] 7. Silica fume: 20 kg / m 3 .

[0051] Preparation steps:

[0052] S1. Weigh each component raw material according to the mass ratio, and then place each component raw material separately for standby;

[0053] S2. Feed cement, sand grains, stones and silica fume into a stirring reaction tank for mixing;

[0054] S3. Add the water reducing agent and water to the stirring reaction tank in batches and stir until the mixture is uniform;

[0055] S4. Use a thermometer and a hygrometer to adjust the ratio of water, sand grains or stones in the construction environment on site to obtain reusable surplus slurry;

[0056] S5. After recycling the surplus slurry, pump it back into the pipe pile cover mold to produce and prepare pole concrete.

[0057] Example 3:

[0058] Raw materials:

[0059] 1. Cement: 435 kg / m 3 ;

[0060] 2. Sand grains: 780 kg / m 3 ;

[0061] 3. Stone: 940 kg / m 3 ;

[0062] 4. Surplus slurry: 200 kg / m 3 ;

[0063] 5. Water reducing agent: 10.3 kg / m 3 ;

[0064] 6. Water: 83 kg / m 3 ;

[0065] 7. Silica fume: 20 kg / m 3 .

[0066] Preparation steps:

[0067] S1. Weigh each component raw material according to the mass ratio, and then place each component raw material separately for standby;

[0068] S2. Feed cement, sand grains, stones and silica fume into a stirring reaction tank for mixing;

[0069] S3. Add water reducing agent and water to the stirring reaction tank in batches and stir until the mixture is uniform;

[0070] S4. Use a thermometer and a hygrometer to adjust the ratio of water, sand grains or stones in the construction environment on site to obtain reusable surplus slurry;

[0071] S5. After recycling the surplus slurry, re-introduce it into the pipe pile cover mold through a pump to produce and prepare pole concrete.

[0072] Control Example 1:

[0073] Raw materials:

[0074] 1. Cement 400 kg / m 3 ;

[0075] 2. Sand grains 770 kg / m 3 ;

[0076] 3. Stones 970 kg / m 3 ;

[0077] 4. Surplus slurry 200 kg / m 3 ;

[0078] 5. Water 200 kg / m 3 ;

[0079] 6. Silica fume 20 kg / m 3 .

[0080] Preparation steps:

[0081] S1. Weigh each component raw material according to the mass ratio, and then place each component raw material separately for standby;

[0082] S2. Feed cement, sand grains, stones and silica fume into a stirring reaction tank for mixing;

[0083] S3. Add water to the stirring reaction tank in batches and stir until the mixture is uniform;

[0084] S4. Use a thermometer and a hygrometer to adjust the ratio of water, sand grains or stones in the construction environment on site to obtain reusable surplus slurry;

[0085] S5. After recycling the remaining slurry, it is re-introduced into the pipe pile cover mold through a pump to produce pole concrete.

[0086] It can be understood that no water reducing agent is used in this comparative example.

[0087] Comparative Example 2:

[0088] Raw materials:

[0089] 1. Cement: 390 kg / m 3 ;

[0090] 2. Sand grains: 790 kg / m 3 ;

[0091] 3. Stones: 970 kg / m 3 ;

[0092] 4. Remaining slurry: 200 kg / m 3 ;

[0093] 5. Sodium tripolyphosphate: 5 kg / m 3 ;

[0094] 6. Water: 100 kg / m 3 ;

[0095] 7. Silica fume: 20 kg / m 3 .

[0096] Preparation steps:

[0097] S1. Weigh each component of the raw materials according to the mass ratio, and then place each component of the raw materials separately for standby;

[0098] S2. Feed the cement, sand grains, stones and silica fume into a stirring reaction tank for mixing;

[0099] S3. Add sodium tripolyphosphate and water to the stirring reaction tank in batches and stir until the mixture is uniform;

[0100] S4. Use a thermometer and a hygrometer to adjust the proportion of water, sand grains or stones in the construction environment on site to obtain reusable remaining slurry;

[0101] S5. After recycling the remaining slurry, it is re-introduced into the pipe pile cover mold through a pump to produce pole concrete.

[0102] It can be understood that sodium tripolyphosphate is used as a water reducing agent in this comparative example 2.

[0103] Specifically, the present invention also discloses the following performance comparison experiments:

[0104] 1. Workability test

[0105] Test method:

[0106] S1. Prepare each group of examples into concrete specimens. Prepare three specimens for each group of examples, pour the concrete specimens into a standard slump cone, vibrate the standard slump cone to remove air bubbles;

[0107] S2. Place the slump cone on a horizontal tabletop and slowly lift the cone;

[0108] S3. Measure the height of the concrete after slumping, and record the average slump data of the three specimens in each group of examples;

[0109] S4. Place the concrete specimens of each group of examples into the test mold of the Vebe apparatus and vibrate to avoid generating air bubbles;

[0110] S5. Start the Vebe apparatus, start measuring the initial setting time, and record the initial setting time and final setting time;

[0111] S6. Pour each group of concrete specimens into the pumping equipment and start pumping, and record the pumping pressure and flow rate;

[0112] S7. Observe and record the fluidity and uniformity of the concrete.

[0113] The slump situation is shown in the following table:

[0114] Table 1 Work performance test

[0115]

[0116] Experimental conclusion:

[0117] From the experimental data of the above three groups of examples and two groups of control examples, it can be seen that the work performance of the three groups of examples in the present invention is excellent, and the slump height, setting time and pumping pressure all meet the uses of concrete in various functional construction environments. However, the work performance of control example 1 is poor and the construction difficulty is large, and the slump in control example 2 is too high and segregation is likely to occur.

[0118] 2. Mechanical property test

[0119] The mechanical property test includes cube compressive strength test and tensile strength test, and the test equipment is a universal testing machine.

[0120] The test method for the cube compressive strength test is as follows:

[0121] S1. Prepare the concrete specimens of each group of examples into cube specimens with a side length of 150 mm, and cure the cube specimens at 20°C and a humidity > 95%;

[0122] S2. At 7 days and 28 days of curing, use a universal testing machine to conduct tests in accordance with "Test Methods for Physical and Mechanical Properties of Concrete" (GB / T 50081).

[0123] S3. Observe and record the test results of the compressive strength test.

[0124] The test method for the tensile strength test is as follows:

[0125] S1. Prepare each group of examples into standard tensile test specimens (10mm * 10mm * 100mm), and cure the tensile test specimens at 20°C and a humidity > 95%.

[0126] At 7 days and 28 days of curing, conduct tests in accordance with "Test Method for Tensile Strength of Concrete" (GB / T 50081).

[0127] S3. Observe and record the test results of the compressive strength test.

[0128] Table 2 Mechanical Property Test Conditions

[0129]

[0130] Experimental Conclusion:

[0131] From the experimental data of the above three groups of examples and two groups of control examples, it can be seen that the mechanical properties shown by Examples 1 - 3 disclosed in the present invention are good, meeting the strength requirements under various working conditions. The mechanical properties of the concrete specimens in the control examples are poor and the strength is insufficient.

[0132] Combining all the above examples, through the above test steps and experimental data, it shows that the recycled slurry formula disclosed in the present invention has significant effects on the strength and durability of the concrete obtained when using the recycled slurry for reproduction. By mixing the recycled slurry with new cement to supplement the active substances in the cement, adding sand and stones as aggregates to fill the gaps, and using sodium gluconate and silica fume in combination, while reducing the water consumption, the mechanical strength of the recycled slurry after solidification is improved, the fluidity and compactness of the recycled slurry are improved, and at the same time, the final strength of the concrete is enhanced. The formula disclosed in the present invention enables the waste recycled slurry in production to be recycled and re - input into the production process, improving the product utilization rate, and having the beneficial effects of being environmentally friendly and reducing production costs.

[0133] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. All equivalent structural transformations made using the description of the present invention under the inventive concept of the present invention, or direct / indirect applications in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A residual slurry recycling formula, characterized in that: The residual slurry recycling formula is calculated by weight as follows: Cement 350~450kg / m 3 ; Sand 750~800kg / m 3 ; Stone 900~1000kg / m 3 ; Residue slurry 200~300kg / m 3 ; Water reducing agent 8.5~10.5kg / m 3 ; Water 80~85kg / m 3 ; Reinforcement agent 20~25kg / m 3 .

2. The slurry recycling formula according to claim 1, characterized in that: The water reducing agent is sodium gluconate.

3. The residual slurry recycling formula according to claim 2, characterized in that: The cement is one or more of composite silicate cement P.C32.5, P.C42.5, ordinary silicate cement P.O32.5, P.O42.5, silicate cement P.II42.5, and P.II52.

5.

4. The slurry recycling formula according to claim 1, characterized in that: The reinforcing agent is silica fume.

5. The slurry recycling formula according to claim 1, characterized in that: The particle size of the stone is 5-40 mm, and the particle size of the sand is 0.075-10 mm.

6. The slurry recycling formula according to claim 1, characterized in that: The residual slurry is one or more of C20, C25, C30, C35, C40, C45, and C50.

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