A method for treating residual concrete waste

Abstract

The invention discloses a method for treating concrete waste, comprising: mixing an additive with concrete waste, stirring for 3min to 5min at a rate of 10r / min to 12r / min, the mass of the additive being 0.33 times to 0.65 times the volume of the concrete waste, the unit of the mass of the additive being kg, the unit of the volume of the concrete waste being cubic meter, the concrete waste being concrete waste obtained by adding water to concrete waste raw materials for 0.5h to 2h, the slump of the concrete waste raw materials being ≥160mm, and the expansion being ≥400mm. The method can effectively utilize concrete waste, has the characteristics of being able to prolong the plasticity and construction fluidity time of concrete, the hydration heat release rate of cementitious materials, and not reducing the strength of concrete after hardening.

Description

Technical Field

[0001] The invention belongs to the technical field of waste material treatment, and in particular relates to a method for treating concrete waste material. Background Art

[0002] At present, the accumulation of concrete waste is increasing. According to incomplete statistics, the annual output is about 1.2 million m 3 of commercial concrete stations, of which the waste volume is about 3000m 3 .

[0003] At present, there are two main modes for the disposal of waste materials from commercial concrete mixing stations. One is to use sand and gravel separation equipment to recycle the separated sand and gravel, and process the slurry water into clean water and filter cake. The clean water can be further used, and the filter cake is discarded; the other is to use waste treatment agents to dry it into granules and replace part of the aggregate. These two methods have obvious defects.

[0004] In the first mode, since various types of cleaning, filtering and recycling equipment are required, the equipment investment is large, the processing cost is high, and the utilization rate of sand and gravel after cleaning is low; in addition, the concrete waste cannot be fully utilized, and some of the waste after processing must be discarded, polluting the environment; the second mode essentially turns high-value cement and admixtures into aggregates, which has greatly reduced the use value of waste, and the replacement rate of gravel utilization is only 0-50%, the resource utilization rate is low, and the economic benefits are greatly reduced. Therefore, there is currently no effective optimal solution for the treatment of commercial concrete waste in the market. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a method for treating concrete waste in view of the above-mentioned deficiencies of the prior art. The method can effectively utilize concrete waste, and has the characteristics of extending the plasticity and construction fluidity time of concrete, the hydration heat release rate of cementitious materials, and not reducing the strength of concrete after hardening.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: a method for treating concrete waste, characterized in that it includes: mixing the additives with the concrete waste, and stirring for 3min to 5min at a rate of 10r / min to 12r / min.

[0007] The above-mentioned method for treating concrete waste is characterized in that the mass of the added component is 0.33 times to 0.65 times the volume of the concrete waste, the unit of the mass of the added component is kg, the unit of the volume of the concrete waste is cubic meter, the concrete waste is the concrete waste obtained by adding water to the concrete waste raw materials for 0.5h to 2h, and the slump of the concrete waste raw materials is ≥160mm and the expansion is ≥400mm.

[0008] The above-mentioned method for treating concrete waste is characterized in that the added component is a mixed system of additives and water, and the additive includes the following components in parts by weight: retarder 7.5%, water reducer 75%, water retaining agent 1.5%, early strength agent 15.5%, air entraining agent 0.3% and foam stabilizer 0.2%.

[0009] The above-mentioned method for treating residual concrete waste is characterized in that the retarder is two or more of white sugar, sodium gluconate, citric acid, potassium sodium tartrate, hexametaphosphate and tripolyphosphate.

[0010] The above-mentioned method for treating residual concrete waste is characterized in that the water reducer is one or more of lignin sulfonate, naphthalene-based water reducer and polycarboxylic acid water reducer.

[0011] The above-mentioned method for treating residual concrete waste is characterized in that the water retaining agent is one or more of hydroxypropyl methylcellulose, hydroxymethyl cellulose, dextrin, weinlun gum, xanthan gum, polyvinyl alcohol and polyacrylate copolymer emulsion.

[0012] The above-mentioned method for treating residual concrete waste is characterized in that the early strength agent is one or more of sulfate, nitrate, sodium nitrite, sodium chloride and triethanolamine.

[0013] The above-mentioned method for treating residual concrete waste is characterized in that the air entraining agent is dodecylbenzene sulfonate, triterpenoid saponin, protein salt or AOS.

[0014] The above-mentioned method for treating residual concrete waste is characterized in that the foam stabilizer is cocamidopropyl hydroxysulfobetaine.

[0015] The above-mentioned method for treating residual concrete waste is characterized in that, in the mixing system of the additive and water, the volume of water is twice the volume of the additive.

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] 1. The method for treating concrete waste of the present invention can effectively utilize concrete waste by mixing additives with concrete waste and stirring at a rate of 10r / min to 12r / min for 3min to 5min. It has the characteristics of extending the plasticity and construction fluidity time of concrete, the hydration heat release rate of cementitious materials, and not reducing the strength of concrete after hardening.

[0018] 2. In the method of the present invention, the added components are retarder, water reducing agent, water retaining agent, early strength agent, air entraining agent and foam stabilizer, which can effectively prolong the plasticity and construction fluidity time of concrete, delay the hydration heat release rate of cementitious materials, and do not reduce the strength of concrete after hardening.

[0019] 3. The method of the present invention includes adding the additives to the concrete waste and then stirring at high speed, which can effectively extend the opening and use time of the concrete.

[0020] The technical solution of the present invention is further described in detail below in conjunction with embodiments. DETAILED DESCRIPTION

[0021] The present invention provides a method for treating residual concrete waste, comprising:

[0022] Step 1, mixing the additive with water to obtain an additive component; the additive comprises the following components in parts by weight: 7.5% retarder, 75% water reducer, 1.5% water retainer, 15.5% early strength agent, 0.3% air entraining agent, and 0.2% foam stabilizer; the volume of the water is twice the volume of the additive;

[0023] The retarder is two or more of white sugar, sodium gluconate, citric acid, potassium sodium tartrate, hexametaphosphate and tripolyphosphate; the white sugar is industrial grade white sugar with a main content of sucrose ≥ 99%; the tripolyphosphate can be, for example, sodium tripolyphosphate; the hexametaphosphate can be, for example, industrial grade sodium hexametaphosphate with a main content (in terms of P2O5) ≥ 68%;

[0024] The water reducer is one or more of lignin sulfonate, naphthalene water reducer and polycarboxylic acid water reducer; the lignin sulfonate may be, for example, sodium lignin sulfonate and / or calcium lignin sulfonate; the naphthalene water reducer is a commonly used naphthalene sulfonate formaldehyde condensate; the polycarboxylic acid water reducer may be 8010 type polycarboxylic acid dry powder water reducer and / or 1530 type polycarboxylic acid dry powder water reducer;

[0025] The water retaining agent is one or more of hydroxypropyl methylcellulose, hydroxymethyl cellulose, dextrin, Wenlun gum, xanthan gum, polyvinyl alcohol and polyacrylate copolymer emulsion; the dextrin can be purchased from Binzhou Desheng Chemical Co., Ltd., with a content of 99%, and a chemical formula (C6H 10 O5) n dextrin; the Wenlun gum, for example, can be purchased from Hebei Danming Biotechnology Co., Ltd., with an effective substance content of 99.9%; the xanthan gum, for example, can be purchased from Hebei Kelongduo Biotechnology Co., Ltd., with an effective substance content of 99.9%; the polyvinyl alcohol, for example, can be purchased from Jinan Xingjian Biotechnology Co., Ltd. PVA 20-99 (H) polyvinyl alcohol; the polyacrylate copolymer emulsion, for example, can be purchased from Beijing Ruishengte Building Materials Co., Ltd. GT-500 polyacrylate copolymer emulsion;

[0026] The early strength agent is one or more of sulfate, nitrate, sodium nitrite, sodium chloride and triethanolamine; the sulfate includes sodium sulfate and / or potassium sulfate; the nitrate includes sodium nitrate and / or potassium nitrate;

[0027] The air entraining agent is dodecylbenzene sulfonate, triterpenoid saponin, protein salt or AOS; the sodium dodecylbenzene sulfonate can be purchased from Jinan Qianqi Chemical Co., Ltd., with a content of 60%; the triterpenoid saponin can be purchased from Shandong Xinshunjie Chemical Technology Co., Ltd., extracted from the rhizome of black cohosh. The AOS can be purchased from China Light Industry Co., Ltd., an anionic surfactant AOS / 92;

[0028] The foam stabilizer is cocamidopropyl hydroxysulfobetaine;

[0029] Step 2: Mix the additive with the concrete waste, and stir for 3min to 5min at a rate of 10r / min to 12r / min; the mass of the additive is 0.33 to 0.65 times the volume of the concrete waste, the unit of the mass of the additive is kg, and the unit of the volume of the concrete waste is cubic meter; the concrete waste is the concrete waste obtained by adding water to the concrete waste raw materials for 0.5h to 2h, and the slump of the concrete waste raw materials is ≥160mm and the expansion is ≥400mm;

[0030] Step 3: Load the system after mixing in step 2 into a concrete tank truck for conventional mixing, or adjust the strength grade of the system after mixing in step 2 and load it into a concrete tank truck for conventional mixing.

[0031] Example 1

[0032] This embodiment provides a method for treating residual concrete waste, comprising:

[0033] Step 1, mixing the additive with water to obtain an additive component; the additive comprises the following components in parts by weight: 7.5% retarder, 75% water reducer, 1.5% water retainer, 15.5% early strength agent, 0.3% air entraining agent, and 0.2% foam stabilizer; the volume of the water is twice the volume of the additive;

[0034] The retarder is white sugar and sodium hexametaphosphate, and the ratio of the mass of the sodium hexametaphosphate to the mass of the white sugar is 1:1;

[0035] The water reducer is a polycarboxylate water reducer, specifically 8010 polycarboxylate dry powder water reducer and 1530 polycarboxylate dry powder water reducer, and the mass of 8010 polycarboxylate dry powder water reducer is 4 times the mass of 1530 polycarboxylate dry powder water reducer;

[0036] The water retaining agent is hydroxypropyl methylcellulose, and the viscosity of the hydroxypropyl methylcellulose is industrial grade 200,000;

[0037] The early strength agent is sodium sulfate;

[0038] The air entraining agent is triterpenoid saponin;

[0039] The foam stabilizer is cocamidopropyl hydroxysulfobetaine;

[0040] Step 2: Mix the additive with the concrete waste and stir at a rate of 11 r / min for 4 min; the mass of the additive is 0.33 times the volume of the concrete waste, the unit of the mass of the additive is kg, and the unit of the volume of the concrete waste is cubic meter; the concrete waste is the concrete prepared in the laboratory, which is added with water for 1.5 hours to obtain the concrete waste, and the concrete prepared in the laboratory is the 1# concrete in Table 1;

[0041] Step 3: Load the system after mixing in step 2 into a concrete tank truck for conventional mixing, or adjust the strength grade of the system after mixing in step 2 and load it into a concrete tank truck for conventional mixing.

[0042] Example 2

[0043] This embodiment is the same as embodiment 1, except that the concrete waste in step 2 is concrete prepared in the laboratory, and the concrete prepared in the laboratory is concrete #2 in Table 4;

[0044] The mass of the added component in step 2 is 0.65 times the volume of the residual concrete waste. The unit of the mass of the added component is kg, and the unit of the volume of the residual concrete waste is cubic meter.

[0045] Example 3

[0046] This embodiment is the same as embodiment 1, except that the concrete waste material in step 2 is the concrete waste material obtained by adding water to the concrete waste material for 1.5 hours, and the slump of the concrete waste material is ≥160mm and the expansion is ≥400mm;

[0047] The mass of the added component in step 2 is 0.65 times the volume of the residual concrete waste. The unit of the mass of the added component is kg, and the unit of the volume of the residual concrete waste is cubic meter.

[0048] Performance evaluation:

[0049] The performance test results of the concrete treated by Example 1 of the present invention are shown in Tables 1 to 3. The test is based on GB / T50080 "Standard for Performance Test Methods of Ordinary Concrete Mixtures", specifically including: the concrete prepared in the laboratory described in step 2 of Example 1 (i.e., 1# concrete) is added with water for 1.5 hours to obtain a control sample (i.e., the residual concrete waste in Example 1), and the concrete treated by the method of Example 1 is placed for 4 hours to obtain 1# test sample; wherein the admixture is a pumping agent, which is a BA-BS type pumping agent purchased from Shaanxi Baian Admixture Co., Ltd.

[0050] Table 1 Composition of 1# concrete and 1# test sample in Example 1

[0051]

[0052] Table 2 Slump and expansion of concrete after treatment in Example 1

[0053] Sample Slump mm Expansion mm 1# Concrete 220 620 Comparison sample 205 580 Treated concrete 230 635 1# Test sample 210 605

[0054] Table 3 Setting time and standard curing strength of concrete after treatment in Example 1

[0055]

[0056] The slump and expansion of the concrete after treatment in Example 1 are shown in Table 2. According to Table 2, the original slump and expansion of the concrete prepared in the laboratory after treatment by the treatment method of the present invention are significantly improved. After the sample is placed, the slump and expansion are reduced accordingly. The 1# test sample obtained after the concrete treated by the present invention is placed for 4 hours is significantly higher than the comparative sample obtained after the concrete waste is placed for 90 minutes. The initial setting time and final setting time of the comparative sample and the 1# test sample and the standard curing strength of each sample after 28 days of placement are shown in Table 3. According to Table 3, the initial setting time and final setting time of the concrete treated by the present invention are significantly improved relative to the comparative sample, and the standard curing strength after placement is higher than the comparative example, which shows that the concrete treated by the method of the present invention has higher strength.

[0057] The performance test results of the treated concrete in Example 2 of the present invention are shown in Tables 4 to 6. The test is based on GB / T50080 "Standard for Performance Test Methods of Ordinary Concrete Mixtures", specifically including: the concrete treated by the method of Example 2 is placed for 9.5 hours to obtain a 2# test sample; the concrete prepared in the laboratory described in step 2 of Example 2 (i.e., 2# concrete) is added with water for 1.5 hours to obtain a control sample (i.e., the residual concrete waste in Example 2); the test additive composition is shown in Table 4, wherein the admixture is a pumping agent, which is a BA-BS type pumping agent purchased from Shaanxi Baian Admixture Co., Ltd.

[0058] Table 4 Composition of 2# concrete and 2# test sample in Example 2

[0059] serial number gravel river sand cement Fly ash Mineral powder Admixtures water 2# Concrete 1068 760 260 70 70 9.3 163 2# Test sample 1068 760 260 70 70 9.3 163

[0060] Table 5 Slump and expansion of concrete after treatment in Example 2

[0061] Sample Slump mm Expansion mm 2# Concrete 220 615 Comparison sample 200 530 Treated concrete 225 635 2# Test sample 205 610

[0062] Table 6 Setting time and standard curing strength of concrete after treatment in Example 2

[0063]

[0064] The slump and expansion of the concrete after treatment in Example 2 are shown in Table 5. According to Table 5, the original slump and expansion of the concrete treated by the treatment method of the present invention are significantly improved compared with the concrete prepared in the laboratory. After the sample is placed, the slump and expansion are reduced accordingly. According to Tables 4 to 6, the initial setting time and final setting time of the concrete treated by the present invention are significantly improved compared with the control sample, and the standard curing strength after being placed for more than 7 days is higher than that of the control sample, which shows that the concrete treated by the method of the present invention has higher strength.

[0065] The performance test results of the concrete of Example 3 of the present invention are shown in Tables 7 to 9. The test is based on GB / T50080 "Standard for Performance Test Methods of Ordinary Concrete Mixtures", and specifically includes: the concrete treated by the method of Example 3 is placed for 8 hours to obtain a 3# test sample; the concrete waste raw materials described in step 1 of Example 3 are placed for 1.5 hours to obtain a control sample (i.e., the concrete waste described in Example 3); wherein the admixture is a pumping agent, which is a BA-BS type pumping agent purchased from Shaanxi Baian Admixture Co., Ltd.

[0066] Table 7: Components of waste materials and treated concrete in Example 3

[0067] serial number gravel river sand cement Fly ash Mineral powder Admixtures water Waste materials 1066 760 260 70 70 9.5 165 3# Test sample 1066 760 260 70 70 9.5 165

[0068] Table 8 Slump and expansion of concrete after treatment in Example 3

[0069] Sample Slump mm Expansion mm Waste materials 205 575 Treated concrete 230 635 3# Test sample 210 615

[0070] Table 9 Setting time and standard curing strength of concrete after treatment in Example 3

[0071]

[0072] The slump and expansion of the concrete after treatment in Example 3 are shown in Table 8. According to Table 8, the slump and expansion of the concrete treated by the treatment method of the present invention are significantly improved relative to the original slump and expansion of the concrete waste. After the sample is placed, the slump and expansion are reduced accordingly. According to Tables 7 to 9, the initial setting time and final setting time of the concrete treated by the present invention are significantly improved relative to the waste raw materials, and the standard curing strength after being placed for more than 7 days is higher than that of the control sample, which shows that the concrete treated by the method of the present invention has higher strength.

[0073] Example 4

[0074] This embodiment provides a method for treating residual concrete waste, comprising:

[0075] Step 1, mixing the additive with water to obtain an additive component; the additive comprises the following components in parts by weight: 7.5% retarder, 75% water reducer, 1.5% water retainer, 15.5% early strength agent, 0.3% air entraining agent, and 0.2% foam stabilizer; the volume of the water is twice the volume of the additive;

[0076] The retarder is sodium gluconate, citric acid and potassium sodium tartrate, and the mass ratio of the sodium gluconate, citric acid and potassium sodium tartrate is 1:1:2;

[0077] The water reducing agent is sodium lignin sulfonate;

[0078] The water retaining agent is dextrin; the water retaining agent can also be hydroxypropyl methylcellulose, hydroxymethyl cellulose, Weinlun gum, xanthan gum, polyvinyl alcohol or polyacrylate copolymer emulsion, or two or more of hydroxypropyl methylcellulose, hydroxymethyl cellulose, dextrin, Weinlun gum, xanthan gum, polyvinyl alcohol and polyacrylate copolymer emulsion;

[0079] The early strength agent is potassium nitrate;

[0080] The air entraining agent is sodium dodecylbenzene sulfonate;

[0081] The foam stabilizer is cocamidopropyl hydroxysulfobetaine;

[0082] Step 2: Mix the additive with the concrete waste and stir for 5 minutes at a rate of 10 r / min; the mass of the additive is 0.33 times the volume of the concrete waste, the unit of the mass of the additive is kg, and the unit of the volume of the concrete waste is cubic meter; the concrete waste is the concrete waste obtained after the concrete waste raw material is added with water for 2 hours, and the slump of the concrete waste raw material is ≥160mm and the expansion is ≥400mm;

[0083] Step 3: Load the system after mixing in step 2 into a concrete tank truck for conventional mixing, or adjust the strength grade of the system after mixing in step 2 and load it into a concrete tank truck for conventional mixing.

[0084] The material properties obtained after the concrete waste is treated in this embodiment are basically consistent with those in Example 3.

[0085] Example 5

[0086] This embodiment provides a method for treating residual concrete waste, comprising:

[0087] Step 1, mixing the additive with water to obtain an additive component; the additive comprises the following components in parts by weight: 7.5% retarder, 75% water reducer, 1.5% water retainer, 15.5% early strength agent, 0.3% air entraining agent, and 0.2% foam stabilizer; the volume of the water is twice the volume of the additive;

[0088] The retarder is sodium tripolyphosphate and sodium gluconate, and the mass ratio of the sodium tripolyphosphate to the sodium gluconate is 1:1;

[0089] The water reducing agent is a naphthalenesulfonate formaldehyde condensate;

[0090] The water retaining agent is Wenlun glue;

[0091] The early strength agent is sodium nitrite;

[0092] The air entraining agent is a protein salt;

[0093] The foam stabilizer is cocamidopropyl hydroxysulfobetaine;

[0094] Step 2: Mix the additive with the concrete waste and stir for 3 minutes at a rate of 12r / min; the mass of the additive is 0.65 times the volume of the concrete waste, the unit of the mass of the additive is kg, and the unit of the volume of the concrete waste is cubic meter; the concrete waste is the concrete waste obtained after the concrete waste raw material is added with water for 2 hours, and the slump of the concrete waste raw material is ≥160mm and the expansion is ≥400mm;

[0095] Step 3: Load the system after mixing in step 2 into a concrete tank truck for conventional mixing, or adjust the strength grade of the system after mixing in step 2 and load it into a concrete tank truck for conventional mixing.

[0096] The material properties obtained after the concrete waste is treated in this embodiment are basically consistent with those in Example 3.

[0097] Example 6

[0098] This embodiment provides a method for treating residual concrete waste, comprising:

[0099] Step 1, mixing the additive with water to obtain an additive component; the additive comprises the following components in parts by weight: 7.5% retarder, 75% water reducer, 1.5% water retainer, 15.5% early strength agent, 0.3% air entraining agent, and 0.2% foam stabilizer; the volume of the water is twice the volume of the additive;

[0100] The retarder is sodium gluconate, sodium hexametaphosphate and potassium sodium tartrate, and the mass ratio of the sodium gluconate, sodium hexametaphosphate and potassium sodium tartrate is 1:2:1;

[0101] The water reducer is 8010 type polycarboxylic acid dry powder water reducer and calcium lignin sulfonate, and the mass of 8010 type polycarboxylic acid dry powder water reducer is twice the mass of calcium lignin sulfonate;

[0102] The water retaining agent is polyvinyl alcohol;

[0103] The early strength agent is triethanolamine;

[0104] The air entraining agent is AOS;

[0105] The foam stabilizer is cocamidopropyl hydroxysulfobetaine;

[0106] Step 2: Mix the additive with the concrete waste and stir for 5 minutes at a rate of 10 r / min; the mass of the additive is 0.33 times the volume of the concrete waste, the unit of the mass of the additive is kg, and the unit of the volume of the concrete waste is cubic meter; the concrete waste is the concrete waste obtained after the concrete waste raw material is added with water for 0.5 hours, and the slump of the concrete waste raw material is ≥160mm and the expansion is ≥400mm;

[0107] Step 3: Load the system after mixing in step 2 into a concrete tank truck for conventional mixing, or adjust the strength grade of the system after mixing in step 2 and load it into a concrete tank truck for conventional mixing.

[0108] The material properties obtained after the concrete waste is treated in this embodiment are basically consistent with those in Example 3.

[0109] Example 7

[0110] This embodiment provides a method for treating residual concrete waste, comprising:

[0111] Step 1, mixing the additive with water to obtain an additive component; the additive comprises the following components in parts by weight: 7.5% retarder, 75% water reducer, 1.5% water retainer, 15.5% early strength agent, 0.3% air entraining agent, and 0.2% foam stabilizer; the volume of the water is twice the volume of the additive;

[0112] The retarder is white sugar, sodium tripolyphosphate, citric acid and sodium gluconate, and the mass ratio of the white sugar, sodium tripolyphosphate, citric acid and sodium gluconate is 1:1:2:1;

[0113] The water reducer is a 1530 type polycarboxylic acid dry powder water reducer and a naphthalenesulfonate formaldehyde condensate, and the mass of the naphthalenesulfonate formaldehyde condensate is 3 times the mass of the 1530 type polycarboxylic acid dry powder water reducer;

[0114] The water-retaining agent is hydroxymethyl cellulose and xanthan gum, and the mass of the hydroxymethyl cellulose is twice the mass of the xanthan gum;

[0115] The early strength agent is sodium chloride;

[0116] The air entraining agent is triterpenoid saponin;

[0117] The foam stabilizer is cocamidopropyl hydroxysulfobetaine;

[0118] Step 2: Mix the additive with the concrete waste and stir for 3 minutes at a rate of 12 r / min; the mass of the additive is 0.4 times the volume of the concrete waste, the unit of the mass of the additive is kg, and the unit of the volume of the concrete waste is cubic meter; the concrete waste is the concrete waste obtained after the concrete waste raw material is added with water for 2 hours, and the slump of the concrete waste raw material is ≥160mm and the expansion is ≥400mm;

[0119] Step 3: Load the system after mixing in step 2 into a concrete tank truck for conventional mixing, or adjust the strength grade of the system after mixing in step 2 and load it into a concrete tank truck for conventional mixing.

[0120] The material properties obtained after the concrete waste is treated in this embodiment are basically consistent with those in Example 3.

[0121] Example 8

[0122] This embodiment provides a method for treating residual concrete waste, comprising:

[0123] Step 1, mixing the additive with water to obtain an additive component; the additive comprises the following components in parts by weight: 7.5% retarder, 75% water reducer, 1.5% water retainer, 15.5% early strength agent, 0.3% air entraining agent, and 0.2% foam stabilizer; the volume of the water is twice the volume of the additive;

[0124] The retarder is sodium tripolyphosphate and sodium gluconate, and the mass ratio of the sodium tripolyphosphate to the sodium gluconate is 1:1;

[0125] The water reducing agent is a naphthalenesulfonate formaldehyde condensate;

[0126] The water retaining agent is a copolymer of Wenlun rubber, hydroxymethyl cellulose and polyacrylate, and the mass ratio of Wenlun rubber, hydroxymethyl cellulose and polyacrylate copolymer is 2:1:1;

[0127] The early strength agent is potassium nitrate, sodium nitrite and triethanolamine, and the mass ratio of potassium nitrate, sodium nitrite and triethanolamine is 1:2:1;

[0128] The air entraining agent is triterpenoid saponin;

[0129] The foam stabilizer is cocamidopropyl hydroxysulfobetaine;

[0130] Step 2: Mix the additive with the concrete waste, and stir for 3 minutes at a rate of 12r / min; the mass of the additive is 0.6 times the volume of the concrete waste, the unit of the mass of the additive is kg, and the unit of the volume of the concrete waste is cubic meter; the concrete waste is the concrete waste obtained after the concrete waste raw material is added with water for 1 hour, and the slump of the concrete waste raw material is ≥160mm and the expansion is ≥400mm;

[0131] Step 3: Load the system after mixing in step 2 into a concrete tank truck for conventional mixing, or adjust the strength grade of the system after mixing in step 2 and load it into a concrete tank truck for conventional mixing.

[0132] The material properties obtained after the concrete waste is treated in this embodiment are basically consistent with those in Example 3.

[0133] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent structural change made to the above embodiment according to the technical essence of the invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A method for treating residual concrete waste, characterized in that: include: The additive component is mixed with concrete waste, and stirred at a speed of 10r / min to 12r / min for 3min to 5min; the mass of the additive component is 0.33 times to 0.65 times the volume of the concrete waste, the unit of the mass of the additive component is kg, the unit of the volume of the concrete waste is cubic meter, the concrete waste is the concrete waste obtained by adding water to the concrete waste raw materials for 0.5h to 2h, the slump of the concrete waste raw materials is ≥160mm, and the expansion is ≥400mm; the additive component is a mixed system of additives and water, and the additive includes the following components in parts by weight: 7.5% of retarder, 75% of water reducer, 1.5% of water retaining agent, 15.5% of early strength agent, 0.3% of air entraining agent and 0.2% of foam stabilizer.

2. A method for treating residual concrete waste according to claim 1, characterized in that: The retarder is two or more of white sugar, sodium gluconate, citric acid, potassium sodium tartrate, hexametaphosphate and tripolyphosphate.

3. A method for treating residual concrete waste according to claim 1, characterized in that: The water reducer is one or more of lignin sulfonate, naphthalene series water reducer and polycarboxylic acid water reducer.

4. A method for treating residual concrete waste according to claim 1, characterized in that: The water retaining agent is one or more of hydroxypropyl methylcellulose, hydroxymethyl cellulose, dextrin, gum thiamethoxam, xanthan gum, polyvinyl alcohol and polyacrylate copolymer emulsion.

5. The method for treating residual concrete waste according to claim 1, characterized in that: The early strength agent is one or more of sulfate, nitrate, sodium nitrite, sodium chloride and triethanolamine.

6. A method for treating residual concrete waste according to claim 1, characterized in that: The air entraining agent is dodecylbenzene sulfonate, triterpenoid saponin, protein salt or AOS.

7. A method for treating residual concrete waste according to claim 1, characterized in that: The foam stabilizer is cocamidopropyl hydroxysulfobetaine.

8. A method for treating residual concrete waste according to claim 1, characterized in that: In the mixed system of the additive and water, the volume of water is twice the volume of the additive.

Images