阅读说明：本技术 一种自保温高强度环保混凝土及其制备方法 (Self-heat-preservation high-strength environment-friendly concrete and preparation method thereof ) 是由 胡艳平 于 2020-08-08 设计创作，主要内容包括：本发明公开了一种自保温高强度环保混凝土,包括以下重量份的原料：水泥200-250份、矿粉50-100份、细沙55-65份、粉煤灰30-40份、改良苯乙烯树脂15-25份、活性膨润土10-20份、界面剂5-15份、减水剂4-10份和去离子水180-200份。本发明以水泥作为基体,加入矿粉、细沙、粉煤灰作为无机配料,矿粉、细沙、粉煤灰由于本身粒度小,同时矿粉、粉煤灰中含有多种活性介质,能够与水泥基体互配,增强混凝土的强度性能；本发明在树脂的选料中采用苯乙烯树脂,一方面是由于苯乙烯树脂综合性能较好,另一方面经过发泡剂发泡后,可以为混凝土引入发泡体,从而降低热量损失,达到自保温性能。(The invention discloses self-heat-insulation high-strength environment-friendly concrete which comprises the following raw materials in parts by weight: 250 parts of cement 200-containing materials, 50-100 parts of mineral powder, 55-65 parts of fine sand, 30-40 parts of fly ash, 15-25 parts of modified styrene resin, 10-20 parts of active bentonite, 5-15 parts of interface agent, 4-10 parts of water reducing agent and 200 parts of deionized water 180-containing materials. The cement is used as a matrix, the mineral powder, the fine sand and the fly ash are added as inorganic ingredients, and the mineral powder, the fine sand and the fly ash have small granularity and contain various active media, so that the mineral powder and the fly ash can be matched with the cement matrix to enhance the strength performance of concrete; the styrene resin is adopted in the selection of the resin, on one hand, the styrene resin has better comprehensive performance, and on the other hand, after foaming by the foaming agent, the styrene resin can introduce the foaming body into the concrete, thereby reducing the heat loss and achieving the self-heat-insulation performance.)

1. The self-heat-insulation high-strength environment-friendly concrete is characterized by comprising the following raw materials in parts by weight:

250 parts of cement 200-containing materials, 50-100 parts of mineral powder, 55-65 parts of fine sand, 30-40 parts of fly ash, 15-25 parts of modified styrene resin, 10-20 parts of active bentonite, 5-15 parts of interfacial agent, 4-10 parts of water reducing agent and 200 parts of deionized water 180-containing materials; wherein the granularity of the mineral powder is 100-200 meshes; the granularity of the fine sand is 500-1000 meshes; the granularity of the fly ash is 50-100 meshes; the water reducing agent is a sulfonated lignin water reducing agent;

the preparation method of the modified styrene resin comprises the following steps:

the method comprises the following steps: styrene resin surface treatment: adding a n-pentane foaming agent into styrene resin for foaming treatment, and then sending the styrene resin into a low-energy plasma treatment instrument for plasma treatment, wherein the treatment power is 2-5kW, and the frequency is 20-30 kHz;

step two: preparing nano active liquid: adding copper chloride into an ethanol solution, then adding sodium chloride accounting for 5 percent of the total amount of the copper chloride to prepare a copper chloride solution, then adding nano silicon dioxide into the copper chloride solution, stirring at the rotation speed of 100-500r/min for 25-35min, adding ammonia water to adjust the pH value to 10-11.0, finally ionizing at the ionization voltage of 220V and the current of 3A for 15-25min to obtain a nano active solution;

step three: modification of styrene resin Activity: mixing the surface-treated styrene resin with the nano-active liquid according to the weight ratio of 1: (8-11) mixing, stirring for 10-20min at the stirring speed of 150-;

step four: deep treatment of styrene resin: and (4) treating the styrene resin treated in the third step by adopting cold plasma, and finishing the treatment.

2. The self-heat-preservation high-strength environment-friendly concrete according to claim 1, which is characterized by comprising the following raw materials in parts by weight: 240 parts of cement 210-doped materials, 60-80 parts of mineral powder, 60-63 parts of fine sand, 32-38 parts of fly ash, 17-22 parts of modified styrene resin, 12-18 parts of active bentonite, 7-11 parts of interface agent, 5-8 parts of water reducing agent and 195 parts of deionized water 185-doped materials.

3. The self-heat-insulation high-strength environment-friendly concrete according to claim 2, which is characterized by comprising the following raw materials in parts by weight: 225 parts of cement, 75 parts of mineral powder, 60 parts of fine sand, 35 parts of fly ash, 20 parts of modified styrene resin, 15 parts of active bentonite, 10 parts of a surfactant, 7 parts of a water reducing agent and 190 parts of deionized water.

4. The self-insulation high-strength environment-friendly concrete according to claim 1, wherein in the second spraying treatment, the filtering liquid spraying beam is sprayed at a speed of 3-5m/s, and the spraying pressure is 2-10 Mpa.

5. The self-heat-insulation high-strength environment-friendly concrete as claimed in claim 1, wherein the frequency of the cold plasma treatment in the fourth step is 8-12MHz, the power is 180-220W, the working gas is nitrogen, the gas flow rate is 100-200mL/min, and the treatment time is 1-5 min.

6. The self-insulation high-strength environment-friendly concrete according to claim 1, characterized in that the preparation method of the activated bentonite comprises the following steps: the bentonite is firstly sent into the activator for high-speed stirring treatment, the stirring speed is 1500-2000r/min, the stirring time is 15-25min, and then the hot-pressing cold-shrinking treatment is carried out, thus obtaining the active bentonite.

7. The self-heat-preservation high-strength environment-friendly concrete according to claim 6, characterized in that the preparation method of the activating agent is as follows: adding lanthanum sulfate into lauryl sodium sulfate for mixing at the mixing speed of 100-200rmin for 35-45min, then adding sodium hexafluorophosphate accounting for 5-10% of the total lanthanum sulfate, continuing to stir for 10-20min, and finally adding ammonia water to adjust the pH value to 10.5.

8. The self-heat-insulation high-strength environment-friendly concrete according to claim 6, which is characterized by comprising the following specific steps of: the bentonite is firstly placed at 400-plus-500 ℃ for hot pressing for 10-20min, the hot pressing pressure is 10-20Mpa, then the temperature is reduced to 270-plus-290 ℃ for heat preservation, the heat preservation is carried out for 15-25min, finally the bentonite is placed in a freezing chamber for freezing, the freezing temperature is-2-0 ℃, the freezing time is 25-35min, and after the freezing is finished, the bentonite is taken out and is recovered to the natural room temperature.

9. The self-heat-insulation high-strength environment-friendly concrete according to claim 1, characterized in that the interface agent comprises the following raw materials in parts by weight: 10-20 parts of cobalt sulfate, 1-5 parts of sodium polysulfide, 2-6 parts of ferric sulfate and 1-3 parts of magnesium stearate.

10. A method for preparing the self-insulation high-strength environment-friendly concrete as claimed in any one of claims 1 to 9, which comprises the following steps: sequentially adding cement, mineral powder, fine sand, fly ash, improved styrene resin, a water reducing agent and deionized water into a stirrer for stirring and mixing, wherein the stirring speed is 1100-1500r/min, the stirring time is 15-25min, then adding an interface agent, reducing the stirring speed to 350-450r/min, stirring for 35-45min, then adding active bentonite, stirring for 25-35min at the speed of 100-200r/min, then sending into a pressure boosting tank for pressure boosting treatment, the pressure boosting pressure is 5-10MPa, standing for 20-30min, and continuously stirring for 30-40min at the speed of 100-200r/min to obtain the self-heat-preservation high-strength environment-friendly concrete.

Technical Field

The invention belongs to the technical field of concrete. More particularly, relates to self-heat-insulation high-strength environment-friendly concrete and a preparation method thereof.

Background

Concrete is a general term for engineering composite materials in which aggregate is cemented into a whole by a cementing material. The term concrete generally refers to cement as a cementing material and sand and stone as aggregate; the cement concrete, also called as common concrete, is obtained by mixing with water (which may contain additives and admixtures) according to a certain proportion and stirring, and is widely applied to civil engineering.

Chinese patent document No. CN104261747A discloses a high-strength phenolic resin concrete, which comprises the following raw materials in parts by weight: 27-29 parts of phenolic resin; 1.5-1.7 parts of dimethylbenzene; butyl acetate accounts for 0.7-0.9 part; 6.8-7.2 parts of polyurethane; 1.2-1.4 parts of benzaldehyde; 0.7-0.9 part of acetone; 0.5-0.7 part of K2CO 3; 7-9 parts of cement; 9-11 parts of sand; 21-23 parts of stones; 7-9 parts of molybdenum disulfide, wherein the average particle size is 5 mu m; 11-13 parts of water; in the document, the phenolic resin is matched with a concrete base material, although the properties such as strength and the like can be improved, the whole is influenced by the curing of the phenolic resin, and meanwhile, the bonding property between organic and inorganic materials is poor due to excessive organic matters such as benzaldehyde, polyurethane and acetone, and the whole property is reduced.

Although the heat preservation and strength performance of the concrete can be improved by adopting a resin mixing mode, the interface compatibility of the resin and the concrete material is poor, the selection and treatment of the resin type are improper, and the performance of the concrete is reduced.

Therefore, there is a need for a self-insulating, high-strength, environmentally friendly concrete.

Disclosure of Invention

The invention aims to provide self-heat-preservation high-strength environment-friendly concrete and a preparation method thereof, and aims to solve the problems in the background art.

In order to achieve the purpose, the invention provides the following technical scheme:

the self-heat-insulation high-strength environment-friendly concrete comprises the following raw materials in parts by weight:

250 parts of cement 200-containing materials, 50-100 parts of mineral powder, 55-65 parts of fine sand, 30-40 parts of fly ash, 15-25 parts of modified styrene resin, 10-20 parts of active bentonite, 5-15 parts of interfacial agent, 4-10 parts of water reducing agent and 200 parts of deionized water 180-containing materials; wherein the granularity of the mineral powder is 100-200 meshes; the granularity of the fine sand is 500-1000 meshes; the granularity of the fly ash is 50-100 meshes; the water reducing agent is a sulfonated lignin water reducing agent;

the preparation method of the modified styrene resin comprises the following steps:

the method comprises the following steps: styrene resin surface treatment: adding a n-pentane foaming agent into styrene resin for foaming treatment, and then sending the styrene resin into a low-energy plasma treatment instrument for plasma treatment, wherein the treatment power is 2-5kW, and the frequency is 20-30 kHz;

step two: preparing nano active liquid: adding copper chloride into an ethanol solution, then adding sodium chloride accounting for 5 percent of the total amount of the copper chloride to prepare a copper chloride solution, then adding nano silicon dioxide into the copper chloride solution, stirring at the rotation speed of 100-500r/min for 25-35min, adding ammonia water to adjust the pH value to 10-11.0, finally ionizing at the ionization voltage of 220V and the current of 3A for 15-25min to obtain a nano active solution;

step three: modification of styrene resin Activity: mixing the surface-treated styrene resin with the nano-active liquid according to the weight ratio of 1: (8-11) mixing, stirring for 10-20min at the stirring speed of 150-;

step four: deep treatment of styrene resin: and (4) treating the styrene resin treated in the third step by adopting cold plasma, and finishing the treatment.

Preferably, the self-heat-insulation high-strength environment-friendly concrete comprises the following raw materials in parts by weight: 240 parts of cement 210-doped materials, 60-80 parts of mineral powder, 60-63 parts of fine sand, 32-38 parts of fly ash, 17-22 parts of modified styrene resin, 12-18 parts of active bentonite, 7-11 parts of interface agent, 5-8 parts of water reducing agent and 195 parts of deionized water 185-doped materials.

Preferably, the self-heat-insulation high-strength environment-friendly concrete comprises the following raw materials in parts by weight: 225 parts of cement, 75 parts of mineral powder, 60 parts of fine sand, 35 parts of fly ash, 20 parts of modified styrene resin, 15 parts of active bentonite, 10 parts of a surfactant, 7 parts of a water reducing agent and 190 parts of deionized water.

Preferably, the filtering liquid jet beam in the step two jet treatment is jetted at the speed of 3-5m/s, and the jet pressure is 2-10 MPa.

Preferably, the frequency of the cold plasma treatment in the fourth step is 8-12MHz, the power is 180-.

Preferably, the preparation method of the active bentonite comprises the following steps: the bentonite is firstly sent into the activator for high-speed stirring treatment, the stirring speed is 1500-2000r/min, the stirring time is 15-25min, and then the hot-pressing cold-shrinking treatment is carried out, thus obtaining the active bentonite.

Preferably, the preparation method of the activator comprises the following steps: adding lanthanum sulfate into lauryl sodium sulfate for mixing at the mixing speed of 100-200rmin for 35-45min, then adding sodium hexafluorophosphate accounting for 5-10% of the total lanthanum sulfate, continuing to stir for 10-20min, and finally adding ammonia water to adjust the pH value to 10.5.

Preferably, the hot-pressing and cold-shrinking specifically comprises the following steps: the bentonite is firstly placed at 400-plus-500 ℃ for hot pressing for 10-20min, the hot pressing pressure is 10-20Mpa, then the temperature is reduced to 270-plus-290 ℃ for heat preservation, the heat preservation is carried out for 15-25min, finally the bentonite is placed in a freezing chamber for freezing, the freezing temperature is-2-0 ℃, the freezing time is 25-35min, and after the freezing is finished, the bentonite is taken out and is recovered to the natural room temperature.

Preferably, the interface agent comprises the following raw materials in parts by weight: 10-20 parts of cobalt sulfate, 1-5 parts of sodium polysulfide, 2-6 parts of ferric sulfate and 1-3 parts of magnesium stearate.

The invention also provides a method for preparing the self-heat-preservation high-strength environment-friendly concrete, which comprises the following steps: sequentially adding cement, mineral powder, fine sand, fly ash, improved styrene resin, a water reducing agent and deionized water into a stirrer for stirring and mixing, wherein the stirring speed is 1100-1500r/min, the stirring time is 15-25min, then adding an interface agent, reducing the stirring speed to 350-450r/min, stirring for 35-45min, then adding active bentonite, stirring for 25-35min at the speed of 100-200r/min, then sending into a pressure boosting tank for pressure boosting treatment, the pressure boosting pressure is 5-10MPa, standing for 20-30min, and continuously stirring for 30-40min at the speed of 100-200r/min to obtain the self-heat-preservation high-strength environment-friendly concrete.

Compared with the prior art, the invention has the following beneficial effects:

(1) the cement is used as a matrix, the mineral powder, the fine sand and the fly ash are added as inorganic ingredients, and the mineral powder, the fine sand and the fly ash have small granularity and contain various active media, so that the mineral powder and the fly ash can be matched with the cement matrix to enhance the strength performance of concrete; the styrene resin is adopted in the selection of the resin, on one hand, the styrene resin has better comprehensive performance, and on the other hand, after foaming by the foaming agent, the foaming body can be introduced into the concrete, so that the heat loss is reduced, and the self-heat-insulation performance is achieved;

however, the styrene resin has increased volume after foaming and poor compatibility with concrete materials, and is improved as a technical difficulty of the invention; firstly, the styrene resin is foamed, then surface active treatment is carried out, the surface energy of the styrene resin is improved, and further the subsequent nano active liquid is better modified, the volume of the styrene resin which is foamed firstly is increased, and convenience is provided for the surface active treatment and the modification effect is improved;

the nano active liquid adopts nano silicon dioxide and copper chloride metal salt to form active nano liquid under the ionization condition, the styrene resin after surface treatment reacts with the nano active liquid, the nano silicon dioxide is attached to the surface of the styrene resin, the specific surface area of the nano silicon dioxide is high, and the activity is strong after modification, therefore, the contact point of the styrene resin is improved, the interfacial property with a concrete raw material is enhanced, the bonding mechanical strength between the raw materials is improved, the adhesion effect of active nano silica is further improved by the jet treatment of a filtering liquid jet beam, the improvement effect of the styrene resin is further improved, finally, the styrene resin is subjected to deep modification treatment by cold plasma, the mixing effect of the raw material and a concrete matrix is further enhanced, the defect of the styrene resin after foaming is perfected, and the bonding strength between the raw materials of a product is also obviously improved.

(2) The bentonite is firstly modified by stirring the activating agent, lanthanum sulfate in the activating agent is dispersed into sodium dodecyl sulfate, the lanthanum sulfate is a rare earth agent and has strong activity, and the lanthanum sulfate can improve the distribution of the lanthanum sulfate in the activating agent after being dispersed by a sodium dodecyl sulfate dispersing agent, so that the activating effect of the lanthanum sulfate on the bentonite is improved, a necessary foundation is provided for the hot-pressing and cold-shrinking treatment of the subsequent bentonite, the bentonite has a lamellar structure, and the lamellar structure can be shrunk by the hot-pressing and cold-shrinking, so that the raw materials in the concrete are tightened, the tight connection degree between the raw materials is improved, and the strength and the heat insulation performance of the product are further improved.

(3) The interface agent is prepared from raw materials such as cobalt sulfate, sodium polysulfide and ferric sulfate, wherein cobalt and iron elements in the raw materials have high activity, and can be simultaneously infiltrated into a concrete raw material to be combined with raw materials such as bentonite and styrene resin, so that a synergistic effect is achieved, the contractibility of the raw materials is further enhanced, and the strength and the heat insulation performance of the product are improved.

Detailed Description

The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to specific embodiments, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.