CN107640941B - Acrylic emulsion toughened plastic concrete with good deformation adaptability and preparation method thereof - Google Patents
Acrylic emulsion toughened plastic concrete with good deformation adaptability and preparation method thereof Download PDFInfo
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Abstract
The invention provides acrylic latex toughened plastic concrete with good deformation adaptability and a preparation method thereof, belonging to the technical field of impermeable concrete engineering. The plastic concrete is prepared by mixing ordinary portland cement, low liquid limit clay, acrylic emulsion, sand, stone, water and a water reducing agent according to the following weight part ratio: 70 parts of ordinary portland cement, 30 parts of low liquid limit clay, 7-20 parts of acrylic emulsion, 450-470 parts of sand, 20 parts of stone, 100-108 parts of water and 0.7-0.8 part of water reducing agent. The plastic concrete prepared by the invention has the technical advantages of easily available raw materials, enough compressive strength, low elastic modulus/strength ratio, strong adaptive deformability, excellent anti-permeability performance, easy construction, environmental protection, no pollution and the like, and can be used for buildings such as impervious walls and the like.
Description
Technical Field
The invention relates to the technical field of impermeable concrete engineering, in particular to acrylic latex toughened plastic concrete with good deformation adaptability and a preparation method thereof.
Background
The plastic concrete is a mixed material prepared by stirring, slurry pouring and condensing raw materials such as cement, water, clay, bentonite, sand, stone and the like.
Compared with common concrete, the cement consumption of the plastic concrete is very low from the viewpoint of material composition and source, and generally does not exceed 200kg/m3Compared with rigid concrete, can save cement by 200kg/m3～300kg/m3The economy is very remarkable; the cement material of the plastic concrete is mixed with bentonite, clay and other plasticity enhancing materials besides the cement, sometimes the two materials can be used simultaneously, wherein the price of the clay is lower than that of the bentonite, the distribution is wide, the clay can be obtained from local materials, and the construction is convenient.
From the aspect of performance, compared with common concrete, the plastic concrete has certain compressive strength which can reach 1-4 MPa, can completely meet the strength required by the engineering of the impervious wall, and has faster later strength increase; the plastic concrete has low elastic modulus and large ultimate strain, can adapt to large deformation without generating large stress in the wall body, and is favorable for improving the stress state of the anti-seepage wall body; the plastic concrete also has good anti-permeability performance, the relative permeability coefficient of the plastic concrete is lower and is generally between 10 & lt-7 & gt and 10 & lt-9 & gt cm/s, the anti-permeability performance of the plastic concrete is close to or even superior to that of rigid concrete, and the requirements of foundation anti-permeability walls of earth-rock dam engineering of various scales can be met.
At present, the research and development of plastic concrete in China are basicallyThe technological route is that the cement consumption is reduced, clay or bentonite is mixed, part of the clay or bentonite is also mixed with fly ash, and a certain amount of sand and stone aggregate is added. The chinese patent publication No. CN102617073A discloses a plastic concrete for impervious walls, the cementitious material of which is composed of cement, bentonite, clay and fly ash, and a certain amount of sand and stone aggregate is additionally added, and the sand rate is 47%, so that the prepared plastic concrete has high strength, but also high elastic modulus, and the elastic modulus/strength ratio as one of the important indexes of the plastic concrete is high, thereby reducing the adaptive deformability of the plastic concrete. The Chinese patent with publication number CN1834054A discloses a high-strength low-elasticity impervious wall material, which comprises plastic concrete and weathered sand flexible material, wherein the plastic concrete cementing material is composed of cement, fly ash and bentonite, the weathered sand flexible material cementing material is composed of cement and bentonite, and the total amount of the cementing material of the plastic concrete reaches 350kg/m3～370kg/m3The total amount of the cementing material of the weathered sand flexible material also reaches 330kg/m3The total amount of cementitious material and the amount of cement used are both high, resulting in a decrease in the economics of the plastic concrete and an increase in stiffness. The invention discloses a micro-shrinkage plastic concrete for backfilling a damaged area of a high-speed railway foundation and a preparation method thereof, wherein the micro-shrinkage plastic concrete comprises cement, aggregate, fly ash, bentonite, an expanding agent, a water reducing agent and an early strength agent in a certain proportion, and is mainly used for backfilling and repairing the damaged area of the roadbed, the plastic concrete has higher strength and micro-shrinkage property due to the use of the early strength agent and the expanding agent, the rigidity of the plastic concrete is increased due to the increase of the rigidity of the plastic concrete, and the later strength of the plastic concrete is increased due to the use of the fly ash, so that the deformation adapting capacity of the plastic concrete is further reduced.
One of the important characteristics of plastic concrete is that the concrete has certain flexibility and can better adapt to the deformation of surrounding materials, and the use of flexible materials such as clay, bentonite and the like can reduce the using amount of cement, thereby reducing the elastic modulus of the concrete and improving the plasticity of the concrete. The cementing materials adopted for preparing the plastic concrete at present mainly comprise cement and bentonite, and part of the cementing materials adopts clay, and most of the bentonite and the clay adopt high liquid limit clays, and the bentonite and the clay basically need to purchase processing finished products from manufacturers. For projects such as impervious walls in remote areas such as Tibet and Xinjiang, the transportation distance is long and the cost is high compared with flexible materials such as clay and bentonite purchased from other places, if local materials can be used, raw materials such as low liquid limit clay dug locally are fully utilized, and high-quality clay can be obtained through simple procedures such as airing, screening and the like and is directly used for preparing plastic concrete, so that the channel sources of the flexible materials are widened, the project cost is saved, and the technical and economic benefits are very obvious.
The inventor of the present application has found through research in the process of implementing the present invention that: the acrylic emulsion is a water dispersion of high molecular polymer, and the addition of the cement-based material can increase the flexural strength and tensile strength, increase the ultimate tensile deformation, greatly reduce the elastic modulus, the water seepage height under certain water pressure and the chloride ion seepage depth, and have remarkable toughening and seepage-proofing effects. At present, the acrylic emulsion is mainly used for preparing acrylic emulsion mortar and is used as an anti-seepage, anti-corrosion and repairing material. In view of the fact that the elastic modulus of the plastic concrete prepared by the existing materials such as bentonite and clay is still high and is difficult to adapt to high-head and large-deformation parts such as deep covering layers and rock foundations, if the toughening and plasticizing effects of the acrylic latex can be utilized, the toughness and deformation adaptability of the plastic concrete can be obviously improved.
At present, no reports are found on the relevant research on preparing the plastic concrete by utilizing the engineering excavation low liquid limit clay and the acrylic emulsion.
Disclosure of Invention
The invention aims to provide acrylic emulsion toughened plastic concrete with good deformation adaptability and a preparation method thereof, which can fully utilize local excavated clay by using local materials, and can obtain high-quality low liquid limit clay by simple airing and screening.
The invention is realized by adopting the following technical scheme:
the acrylic emulsion toughened plastic concrete with good deformation adaptability is prepared by mixing ordinary portland cement, low liquid limit clay, acrylic emulsion, sand, stone, water and a water reducing agent in parts by weight as follows: 70 parts of ordinary portland cement, 30 parts of low liquid limit clay, 7-20 parts of acrylic emulsion, 450-470 parts of sand, 20 parts of stone, 100-108 parts of water and 0.7-0.8 part of water reducing agent.
Further, the ordinary portland cement is 42.5 ordinary portland cement meeting GB 175-2007.
Furthermore, the liquid limit of the low liquid limit clay is 32.6%, the plastic limit is 17.8%, the plasticity index is 14.8, the content of particles (0.075 mm-0.005 mm) is 64%, and the content of clay particles (0.005 mm-0.002 mm) is 26%.
Further, the acrylic emulsion is acrylic ester copolymer emulsion, the nonvolatile matter content of the acrylic emulsion is 47%, the pH value is 9.6, and the viscosity is 1200 mPas.
Further, the sand is continuous graded artificial sand meeting DL/T5144-2015, the stone powder with the particle size of less than 0.16mm is 20.7 percent, the fineness modulus is 2.4, and the apparent density is 2680kg/m3。
Further, the stone is artificial macadam with the particle size range of 5-15 mm and the apparent density of 2710kg/m, and meets the technical requirements of DL/T5144-3。
Further, the water reducing agent is a PCA polycarboxylic acid high-performance water reducing agent meeting GB 8076-2008.
A preparation method of acrylic emulsion toughened plastic concrete with good deformation adaptability comprises the following steps:
step 3, sequentially adding the raw materials weighed in the step 2 into a forced mixer in the order of sand, cement, clay and stone, starting the mixer to mix for 30s, then adding the third emulsion and the water reducing agent dissolved in water, and starting the mixer to mix for 2 min;
and 4, unloading the concrete mixture mixed in the step 3 on a steel plate, scraping the mixture adhered to the stirrer, and manually stirring for 2-3 times to obtain the plastic concrete.
Further, step 1 specifically comprises:
step 1-1: assuming apparent density m of plastic concretec,eSelecting the dosage m of ordinary portland cementcLow liquid limit clay dosage mnThe dosage of the third milk is mbVolume sand ratio Sv(ii) a Preliminarily selecting unit water consumption mw；
Step 1-2: determining the total mass m of sands,g＝mc,e-(mc+mn+mb+mw)；
Step 1-3: determining the amount of sand ms＝ms,gSvAmount of stone mg＝ms,g(1-Sv)；
Step 1-4: determining the adjustment of slump range controlled according to the test and determining the final unit water consumption mw’。
Further, the liquid limit of the low liquid limit clay is 32.6%, the plastic limit is 17.8%, the plasticity index is 14.8, the content of particles (0.075 mm-0.005 mm) is 64%, and the content of clay particles (0.005 mm-0.002 mm) is 26%; the acrylic emulsion is acrylic ester copolymer emulsion, the nonvolatile matter content of the acrylic emulsion is 47%, the pH value is 9.6, and the viscosity is 1200mPa & s; the sand is continuous graded artificial sand meeting the requirements of DL/T5144-2015, the content of stone powder with the particle size of less than 0.16mm is 20.7 percent, the fineness modulus is 2.4, and the apparent density is 2680kg/m3(ii) a The stone is artificial macadam with the particle size range of 5-15 mm and the apparent density of 2710kg/m, and meets the technical requirements of DL/T5144-3(ii) a The water reducing agent is a PCA polycarboxylic acid high-performance water reducing agent meeting GB 8076-.
Further, in the step 3, the forced mixer is an SJD100 forced concrete mixer with the capacity of 100L and the rotating speed of 22 r/min.
The concrete action mechanism of the invention that the low liquid limit clay and the acrylic emulsion are mixed into the cement-based material to ensure that the concrete has enough strength and good deformation adaptability is as follows: the clay contains a large amount of montmorillonite and kaolinite minerals, the unit water consumption of the plastic concrete is large, the montmorillonite and kaolinite layered structures in a clay-water system under a large amount of free water environment react with water to generate expansion and viscosity, so that the components are extruded and bonded mutually, silicon and aluminum oxides in the clay can generate new hydration products C-S-H and C-A-H (shown in figure 1) under a cement hydration environment, and cement particles and gel system-sand-stone gaps are further filled to ensure that the cement particles and the gel system-sand-stone gaps have sufficient strength.
The plasticity index of the low liquid limit clay is 14.8, the content of clay grains (0.005 mm-0.002 mm) is 26%, the clay is doped into a gelling system to replace 30% of cement, the viscosity composition in the concrete is increased, the elastic modulus is reduced, the rigidity of the concrete is reduced, and the concrete has good capability of adapting to deformation under the action of bearing a certain load. The acrylic emulsion is a water dispersion of high molecular polymer, is mixed and stirred to form a high molecular polymer emulsion modified cement-based material, and further increases the toughness of the plastic concrete and improves the deformation-adapting capability of the plastic concrete by utilizing the good dispersibility and the toughening seepage-proofing property of the acrylic emulsion.
The invention has the following beneficial effects:
(1) the raw materials are easy to obtain
The low liquid limit clay provided by the invention can be used by airing and screening the clay directly excavated in engineering according to the principle of local materials, and finished clay, bentonite and other materials do not need to be purchased from other places, so that the source channel of flexible materials is expanded, and the engineering cost is saved.
(2) The cement consumption is low
The cement consumption of the acrylic emulsion toughened plastic concrete provided by the invention is 200kg/m3Cement consumption (260 kg/m) of plastic concrete for diaphragm wall of second cofferdam in three gorges project3) Reduce 60kg/m3Economy ofThe benefit is very obvious.
(3) Sufficient compressive strength
The cubic compressive strength of the acrylic emulsion toughened plastic concrete in 7 days and 28 days respectively reaches 1.01 MPa-2.67 MPa and 1.93 MPa-3.98 MPa, while the cubic compressive strength of the impervious wall material in 28 days usually needs to reach 1 MPa-4 MPa, namely the strength of the acrylic emulsion toughened plastic concrete provided by the invention can completely meet the design requirement.
(4) Low modulus of elasticity/strength ratio (modulus/Strength ratio)
The acrylic emulsion toughened plastic concrete provided by the invention has a 28-day compressive elastic modulus of 485-898 MPa which is far smaller than that of common concrete (generally larger than 10GPa), and a 28-day modulus/strength ratio in a range of 214-250, the average value is 232, and the average value is also far smaller than the requirement that the common requirement that the modulus/strength ratio of the plastic concrete is lower than 500, namely the plastic concrete provided by the invention has good flexibility and can well adapt to the deformation of surrounding structures.
(5) Excellent anti-permeability performance
The acrylic emulsion toughened plastic concrete provided by the invention has a 28-day relative permeability coefficient of 1.45 × 10-7cm/s～9.81×10-7cm/s, when the weight portion ratio of the acrylic latex is 7-10, the anti-seepage grade of the acrylic latex is close to that of plastic concrete of the second-stage cofferdam of the three gorges project, and the integral anti-seepage effect of the anti-seepage wall can be ensured.
(6) Good construction performance
The slump of the plastic concrete mixture provided by the invention reaches 180-200 mm, an air entraining agent is not required to be doped, the air content of the plastic concrete mixture can reach 4.5-5.5%, the mixture performance is good, the phenomena of bleeding and segregation are avoided, and the pumping construction is easy. The construction process of the acrylic emulsion toughened plastic concrete is the same as that of common concrete, the acrylic emulsion and other raw materials are added into a stirrer to be uniformly stirred during stirring, and the adaptability of the acrylic emulsion and other raw materials is good.
(7) Environmental protection and no pollution
The low liquid limit clay adopted by the invention fully utilizes engineering excavation materials, and the clay excavation only needs simple airing and screening, so that the environment is not polluted. The third-class emulsion is non-toxic, harmless and pollution-free to the environment, and belongs to a green environment-friendly product.
Drawings
FIG. 1 is a graph of 5000 times amplification of 28 day hydration product when the low liquid limit clay used in the present invention is used in combination with propylene emulsion;
FIG. 2 is a schematic diagram showing the cubic compressive strengths of concrete prepared by selecting different dosages of acrylic emulsion in different ages according to various embodiments of the present invention.
Detailed Description
The technical solution of the present invention will be clearly and completely described below with reference to specific embodiments.
Example 1
The embodiment of the invention adopts a mass method to design the mixing proportion of the plastic concrete, and assumes the apparent density m of the concretec,eIs 2100kg/m3The slump is required to reach 180-220 mm, the gas content is 3.5-5.0%, and the 28-day cube compressive strength is 1-4 MPa.
The invention provides a preparation method of acrylic emulsion toughened plastic concrete with good deformation adaptability, which comprises the following steps:
specifically, assume the apparent density m of the plastic concretec,eIs 2100kg/m3The dosage of the ordinary Portland cement is mcIs 200kg/m3Low liquid limit clay dosage mnIs 100kg/m3The dosage of the third milk is mbIs 20kg/m3Volume sand ratio SvIs 95 percent; preliminarily selecting unit water consumption mwIs 300kg/m3；
Determining the total mass m of sands,g＝mc,e-(mc+mn+mb+mw)＝1480kg/m3；
Determining the amount of sand ms＝ms,gSv＝1406kg/m3Amount of stone mg＝ms,g(1-Sv)＝74kg/m3；
Controlling slump range adjustment according to test and determining final unit water consumption mw’＝300kg/m3。
And 2, preparing raw materials according to the calculation result of the step 1, respectively weighing 70 parts of ordinary portland cement, 30 parts of low liquid limit clay, 7 parts of propyl-emulsion, 480 parts of sand, 30 parts of stone, 0.7 part of water reducing agent and 100 parts of water, and dissolving the water reducing agent in the water.
Step 3, sequentially adding the raw materials weighed in the step 2 into a forced mixer according to the sequence of sand, cement, clay and stone, starting the mixer to mix for 30s, then adding water (dissolving a water reducing agent) and acrylic emulsion, and starting the mixer to mix for 2 min;
and 4, unloading the concrete mixture mixed in the step 3 on a steel plate, scraping the mixture adhered to the stirrer, and manually stirring for 2-3 times to obtain the prepared plastic concrete.
According to the test results, the mixing proportion parameter of the plastic concrete in the example 1 is mw:mc:mn:mb:ms:mgTest data of slump 180mm, gas content 5.5%, and excellent workability were as follows, compressive strengths of 7 days and 28 days were 2.67MPa and 3.76MPa, respectively, elastic modulus of 28 days was 898MPa, elastic modulus/compressive strength ratio of 28 days was 239, and relative permeability coefficient of 28 days was 1.45 × 10-7cm/s (see FIG. 2).
Referring to example 1, other steps adjust the relevant parameters to obtain the following mix proportion parameters:
the weight parts of the components in the embodiment 2 are as follows: 102 parts of water, 70 parts of cement, 30 parts of clay, 10 parts of acrylic emulsion, 460 parts of sand and 20 parts of stone. The assay was performed using standard methods and the experimental data were as follows: slump of 182mm, gas content of 5.0%, workability is excellent, compressive strength of 3.02MPa and 3.98MPa in 7 days and 28 days, elastic modulus of 854MPa in 28 days,the modulus of elasticity/compressive strength ratio was 214 for 28 days and the relative permeability coefficient was 2.01 × 10 for 28 days-7cm/s。
In example 3, the compositions in parts by weight are 104 parts of water, 70 parts of cement, 30 parts of clay, 13 parts of propylene milk, 460 parts of sand and 20 parts of stone, and the slump is 181mm, the gas content is 5.1%, the workability is excellent, the compressive strength in 7 days and 28 days is 1.99MPa and 2.62MPa respectively, the elastic modulus in 28 days is 583MPa, the ratio of the elastic modulus to the compressive strength in 28 days is 223, and the relative permeability coefficient in 28 days is 4.75 × 10 according to the detection by a standard method-7cm/s。
The compositions in the example 4 comprise, by weight, 106 parts of water, 70 parts of cement, 30 parts of clay, 17 parts of acrylic emulsion, 450 parts of sand and 20 parts of stone, and the slump is 180mm, the gas content is 5.1%, the workability is good, the compressive strength in 7 days and 28 days is 1.45MPa and 2.26MPa respectively, the elastic modulus in 28 days is 527MPa, the ratio of the elastic modulus to the compressive strength in 28 days is 233, and the relative permeability coefficient in 28 days is 6.76 × 10 according to the detection by a standard method-7cm/s。
The concrete is prepared from 108 parts of water, 70 parts of cement, 30 parts of clay, 20 parts of propylene emulsion, 450 parts of sand and 20 parts of stone by weight according to the following experimental data of standard method detection, wherein the slump is 180mm, the gas content is 5.2%, the workability is good, the compressive strength in 7 days and 28 days is 1.01MPa and 1.93MPa respectively, the elastic modulus in 28 days is 483MPa, the ratio of the elastic modulus to the compressive strength in 28 days is 250, and the relative permeability coefficient in 28 days is 9.81 × 10-7cm/s。
In the above embodiment, the ordinary portland cement is a hydraulic cementing material made of 80-95% of portland cement clinker, a proper amount of gypsum and 5-20% of mixed materials, and has compressive strengths of not less than 17.0MPa and 42.5MPa in 3 days and 28 days, and flexural strengths of not less than 3.5MPa and 6.5MPa in 3 days and 28 days, respectively.
The liquid limit of the low liquid limit clay is 32.6 percent, the plastic limit is 17.8 percent, the plasticity index is 14.8, the content of particles (0.075-0.005 mm) is 64 percent, and the content of clay particles (0.005-0.002 mm) is 26 percent;
the acrylic emulsion is acrylic ester copolymer emulsion, the nonvolatile matter content of the acrylic emulsion is 47%, the pH value is 9.6, the viscosity is 1200 mPa.s, and the acrylic ester copolymer emulsion is specifically produced by Hebei Ruidan engineering rubber and plastic company Limited;
the sand is continuous graded artificial sand meeting the requirements of DL/T5144-2015, the stone powder with the particle size of less than 0.16mm contains 20.7 percent, the fineness modulus is 2.4, and the apparent density is 2680kg/m3；
The stone is artificial stone with the particle size of 5-15 mm meeting the technical requirements of DL/T5144-3；
The water reducing rate of the water reducing agent is 31 percent, in particular to a PCA polycarboxylic acid high-performance water reducing agent which is produced by Jiangsu Borter and meets the technical requirement of GB 8076-2008.
The plastic concrete prepared in the above examples was subjected to mechanical, deformation and impermeability tests to obtain the test results shown in the following table:
TABLE 1 Main Property parameters of the present invention with good deformation adaptability for acrylic-emulsion toughened plastic concrete
The acrylic emulsion toughened plastic concrete with good deformation adaptability has wide application prospect in dam foundation vertical seepage prevention, dangerous reservoir reinforcement treatment, dike, cofferdam and other water conservancy and hydropower engineering.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (6)
1. The acrylic emulsion toughened plastic concrete with good deformation adaptability is characterized in that: the cement is prepared by mixing ordinary portland cement, low liquid limit clay, acrylic emulsion, sand, stone, water and a water reducing agent according to the following weight part ratio: 70 parts of ordinary portland cement, 30 parts of low liquid limit clay, 7-20 parts of acrylic emulsion, 450-470 parts of sand, 20 parts of stone, 100-108 parts of water and 0.7-0.8 part of water reducing agent; the ordinary portland cement is 42.5 ordinary portland cement meeting GB 175-2007; the liquid limit of the low liquid limit clay is 32.6%, the plastic limit is 17.8%, the plasticity index is 14.8, the content of 0.075 mm-0.005 mm of particles is 64%, and the content of 0.005 mm-0.002 mm of clay particles is 26%; the acrylic emulsion is acrylic ester copolymer emulsion, the nonvolatile matter content of the acrylic emulsion is 47%, the pH value is 9.6, and the viscosity is 1200 mPa.
2. The acrylic emulsion toughened plastic concrete with good deformation adaptability of claim 1, wherein: the sand is continuous graded artificial sand meeting the requirements of DL/T5144-2015, the content of stone powder with the particle size of less than 0.16mm is 20.7 percent, the fineness modulus is 2.4, and the apparent density is 2680kg/m3。
3. The acrylic emulsion toughened plastic concrete with good deformation adaptability of claim 1, wherein: the stone is artificial macadam with the particle size of 5-15 mm and the apparent density of 2710kg/m, and meets the technical requirements of DL/T5144-3。
4. The acrylic emulsion toughened plastic concrete with good deformation adaptability of claim 1, wherein: the water reducing agent is a PCA polycarboxylic acid high-performance water reducing agent meeting GB 8076-.
5. The preparation method of the acrylic emulsion toughened plastic concrete with good deformation adaptability is characterized by comprising the following steps:
step 1, calculating mix proportion parameters: calculating the material consumption of the plastic concrete by adopting a mass method, primarily recommending the cement mass and the clay mixing amount, and calculating the total mass of sand and stone and the respective mass of the sand and the stone according to the sand rate; controlling the concrete slump through indoor trial mixing, and adjusting and determining the unit water consumption, thereby obtaining the consumption of each raw material in the plastic concrete;
step 2, preparing raw materials according to the calculation result of the step 1, respectively weighing 70 parts of ordinary portland cement, 30 parts of low liquid limit clay, 7-20 parts of propyl emulsion, 450-470 parts of sand, 20 parts of stone, 0.7-0.8 part of water reducing agent and 100-108 parts of water according to parts by weight, and dissolving the water reducing agent in the water;
step 3, sequentially adding the raw materials weighed in the step 2 into a forced mixer in the order of sand, cement, clay and stone, starting the mixer to mix for 30s, then adding the third emulsion and the water reducing agent dissolved in water, and starting the mixer to mix for 2 min;
step 4, unloading the concrete mixture mixed in the step 3 on a steel plate, scraping the mixture adhered to the stirrer, and manually stirring for 2-3 times to obtain plastic concrete;
the liquid limit of the low liquid limit clay is 32.6%, the plastic limit is 17.8%, the plasticity index is 14.8, the content of 0.075 mm-0.005 mm of particles is 64%, and the content of 0.005 mm-0.002 mm of clay particles is 26%; the acrylic emulsion is acrylic ester copolymer emulsion, the nonvolatile matter content of the acrylic emulsion is 47%, the pH value is 9.6, and the viscosity is 1200mPa & s; the sand is continuous graded artificial sand meeting the requirements of DL/T5144-2015, the content of stone powder with the particle size of less than 0.16mm is 20.7 percent, the fineness modulus is 2.4, and the apparent density is 2680kg/m3(ii) a The stone is artificial macadam with the particle size of 5-15 mm and the apparent density of 2710kg/m, and meets the technical requirements of DL/T5144-3(ii) a The water reducing agent is a PCA polycarboxylic acid high-performance water reducing agent meeting GB 8076-.
6. The preparation method of the acrylic emulsion toughened plastic concrete as claimed in claim 5, wherein the step 1 specifically comprises:
step 1-1: assuming apparent density m of plastic concretec,eSelecting the dosage m of ordinary portland cementcLow liquid limit clay dosage mnThe dosage of the third milk is mbVolume sand ratio Sv(ii) a Preliminarily selecting unit water consumption mw；
Step 1-2: determining the total mass m of sands,g=mc,e-（mc+mn+mb+mw）；
Step 1-3: determining the amount of sand ms= ms,gSvAmount of stone mg= ms,g(1-Sv)；
Step 1-4: determining the adjustment of slump range controlled according to the test and determining the final unit water consumption mw’。
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| 沙湾电站塑性混凝土防渗墙施工技术和质量评价;罗武，李春云;《四川水利》;20100630(第3期);第2.2.1-2.2.2节 * |
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| CN107640941A (en) | 2018-01-30 |
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