Adsorption regulation and control material for tunnel hole slag stone powder and application of adsorption regulation and control material

Abstract

The invention discloses an adsorbability regulating and controlling material for tunnel hole slag stone powder and application. The adsorbability regulating and controlling material is prepared by mixing a surface active component, a complexing component and an anti-mud component according to the mass ratio of (3-7): 1: (0.5-5), the surface active component is one or more of dodecyl trimethyl ammonium chloride, dodecyl dimethyl benzyl ammonium chloride and didodecyl trimethyl ammonium chloride; the complexing component is one or more of sodium silicate and sodium hexametaphosphate; the anti-mud component is one or more of polyethylene glycol, beta-cyclodextrin and dimethyl diallyl ammonium chloride. The adsorbability regulating and controlling material can improve the adsorbability of the tunnel hole slag stone powder and ensure the working performance of the concrete.

Description

Technical Field

[0001] The invention belongs to the technical field of civil engineering materials, and in particular relates to an adsorption regulating material for tunnel slag powder and application thereof. Background Art

[0002] With the rapid development of major projects such as high-speed railways, highways, and underground railways in my country, the number of tunnel projects has continued to rise. Tunnel slag stone powder, as the original material for tunnel slag aggregate and stone powder mineral admixture for concrete, has a huge output during tunnel construction. So far, tunnel slag stone powder has been preliminarily applied to concrete projects. The nucleation, filling, chemical and dilution effects of stone powder in concrete can improve the density of cement matrix and interface transition zone to a certain extent, and has the effects of promoting the growth and precipitation of early hydration products and adjusting the hydration heat release rate.

[0003] However, in actual projects, it was found that concrete with stone powder had poor working performance. The high adsorption of stone powder is affected by the characteristics of its parent rock, the mineral composition and structure of the parent rock, the surface charge distribution of stone powder, etc. For example, granite, tuff, gneiss, etc. often contain quartz, feldspar, mica and other minerals, which can absorb a large amount of water reducer, resulting in poor workability of concrete and large slump loss; on the other hand, there is often a certain amount of clay in stone powder, such as common clay minerals such as montmorillonite, kaolinite and illite, and layered clay materials have higher surface energy, which are easy to adsorb water reducers, thus affecting the working performance of concrete.

[0004] How to effectively control the adsorption of stone powder without affecting the mechanical properties and durability of concrete is a technical problem that needs to be solved urgently, and it is of great significance to the large-scale utilization of tunnel slag stone powder. Summary of the invention

[0005] In view of this, the present invention aims to solve the engineering problem that tunnel slag powder has large adsorption capacity, resulting in poor concrete workability and large slump loss, and proposes an adsorption regulating material for tunnel slag powder and a method of using the material, so as to provide technical support for the resource utilization of tunnel engineering slag.

[0006] In order to achieve the above object, the present invention adopts the following technical solution:

[0007] An adsorption control material for tunnel slag powder, which is prepared by mixing three components, namely, a surfactant component, a complex component and an anti-mud component, in a mass ratio of 5-6:1:3-4;

[0008] The surfactant component is one or more of dodecyltrimethylammonium chloride, dodecyldimethylbenzylammonium chloride, and didodecyltrimethylammonium chloride;

[0009] The complexing component is one or more of sodium silicate and sodium hexametaphosphate;

[0010] The anti-mud component is one or more of polyethylene glycol, beta-cyclodextrin, and dimethyldiallylammonium chloride.

[0011] Preferably, the mass ratio of the surfactant component, the complexing component and the anti-mud component is 3-7:1:0.5-5.

[0012] Preferably, the tunnel slag powder is one or more of granite, gneiss, limestone, dolomite, slate, tuff and basalt.

[0013] The present invention also provides a method for preparing modified tunnel slag powder, comprising the following steps:

[0014] (1) Determine the rock properties of tunnel slag powder;

[0015] (2) The adsorption regulating material according to any one of claims 1 to 3 is added to tunnel slag stone powder, and the amount of the adsorption regulating material is 0.02% to 2.00% of the total amount of the stone powder;

[0016] (3) The mixed material is placed in a homogenizing device, mixed evenly at high speed, and then transferred to a finished product bin. After the material is cooled to a constant temperature, a modified tunnel slag powder material is obtained.

[0017] Preferably, the dosage of the adsorptive regulating material is determined by measuring the MB value of the tunnel slag stone powder: when 1.0g / kg<stone powder MB value≤2.0g / kg, the dosage of the adsorptive regulating material is 0.02%~0.5% of the total amount of stone powder; when 2.0g / kg<stone powder MB value≤5.0g / kg, the dosage of the adsorptive regulating material is 0.5%~1.0% of the total amount of stone powder; when 5.0g / kg<stone powder MB value≤10.0g / kg, the dosage of the adsorptive regulating material is 1.0%~2.0% of the total amount of stone powder; when the stone powder MB value>10.0g / kg, the adsorptive regulating material described in any one of claims 1-3 is no longer applicable.

[0018] A tunnel slag stone powder-based concrete comprises cement, water, coarse aggregate, fine aggregate, admixture and modified tunnel slag stone powder material.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The present invention realizes the competitive adsorption, strong dispersion, adsorption complexation and synergistic dispersion of typical groups such as silicate, phosphoric acid, methylphosphonic acid, ester group, sulfonic acid and carboxylic acid group, through the addition of surfactant components, complex components and anti-mud components. DETAILED DESCRIPTION

[0021] The following description of embodiments of the present invention is intended to explain the present invention but is not to be construed as limiting the present invention.

[0022] Embodiment 1:

[0023] A method for preparing tunnel slag stone powder-based concrete, the specific steps are as follows:

[0024] 1) 100 kg of gneiss tunnel slag powder was measured and the specific surface area of ​​the powder was 572 m 2 / kg, and the MB value of the stone powder before adsorption optimization was obtained by sampling and measurement to be 3.0g / kg.

[0025] 2) 350 g of dodecyltrimethylammonium chloride powder, 70 g of sodium silicate powder, and 280 g of β-cyclodextrin powder were weighed and homogenized in a homogenizing device for 20 minutes to obtain 200 g of an adsorption regulating material for stone powder.

[0026] 3) 100 kg of gneiss rock powder and 700 g of adsorption regulating material were placed in a homogenizing device. After homogenization for 30 minutes, gneiss rock powder with optimized adsorption was obtained.

[0027] 4) The MB value of the stone powder after adsorption optimization was measured and found to be 1.0 g / kg.

[0028] Embodiment 2:

[0029] A method for preparing tunnel slag stone powder-based concrete, the specific steps are as follows:

[0030] 1) 200 kg of granite tunnel slag powder was measured and the specific surface area of ​​the powder was 466 m 2 / kg, and the MB value of the stone powder before adsorption optimization was obtained by sampling and measurement, which was 2.5g / kg.

[0031] 2) Weigh 360 g of didodecyltrimethylammonium chloride powder, 360 g of dodecyltrimethylammonium chloride powder, 120 g of sodium hexametaphosphate, and 360 g of polyethylene glycol powder, and homogenize them in a homogenizing device for 20 minutes to obtain 1.2 kg of adsorption regulating material for stone powder.

[0032] 3) 200 kg of gneiss powder and 1.2 kg of adsorption regulating material were placed in a homogenizing device. After homogenization for 30 minutes, granite powder with optimized adsorption was obtained.

[0033] 4) The MB value of the granite powder after adsorption optimization was measured to be 1.0 g / kg.

[0034] Embodiment 3:

[0035] A method for preparing tunnel slag stone powder-based concrete, the specific steps are as follows:

[0036] 1) 200 kg of granite tunnel slag powder was measured and the specific surface area of ​​the powder was 594 m2 / kg. The MB value of the powder before adsorption optimization was 7.0 g / kg.

[0037] 2) 900 g of didodecyltrimethylammonium chloride powder, 900 g of dodecyltrimethylammonium chloride powder, 300 g of sodium hexametaphosphate, and 900 g of polyethylene glycol powder were weighed and homogenized in a homogenizing device for 20 minutes to obtain 3 kg of adsorption regulating material for stone powder.

[0038] 3) 200 kg of gneiss powder and 3 kg of adsorption regulating material were placed in a homogenizing device. After homogenization for 30 minutes, granite powder with optimized adsorption was obtained.

[0039] 4) The MB value of the granite powder after adsorption optimization was measured to be 0.5 g / kg.

[0040] 5) Use the optimized granite powder to carry out concrete performance testing.

[0041] Comparative Example 1:

[0042] A method for preparing tunnel slag stone powder-based concrete, the specific steps are as follows:

[0043] 1) For 100 kg of gneiss rock powder, the specific surface area of ​​the powder was measured to be 572 m 2 / kg, and the MB value of the stone powder before adsorption optimization was obtained by sampling and measurement to be 3.0g / kg.

[0044] 2) 550 g of dodecyltrimethylammonium chloride powder and 150 g of β-cyclodextrin powder were weighed and homogenized in a homogenizing device for 20 minutes to obtain 700 g of the adsorption regulating material for stone powder.

[0045] 3) 100 kg of gneiss rock powder and 700 g of adsorption regulating material were placed in a homogenizing device. After homogenization for 30 minutes, gneiss rock powder with optimized adsorption was obtained.

[0046] 4) The MB value of the stone powder after adsorption optimization was measured and found to be 2.5 g / kg.

[0047] 5) Use the optimized granite powder to carry out concrete performance testing.

[0048] Comparative Example 2:

[0049] A method for preparing tunnel slag stone powder-based concrete, the specific steps are as follows:

[0050] 1) For 200kg of granite rock powder, the specific surface area of ​​the powder was measured to be 466m 2 / kg, and the MB value of the stone powder before adsorption optimization was obtained by sampling and measurement, which was 2.5g / kg.

[0051] 2) Weigh 10 g of didodecyltrimethylammonium chloride powder, 40 g of dodecyltrimethylammonium chloride powder, 20 g of sodium hexametaphosphate, and 130 g of polyethylene glycol powder, and homogenize them in a homogenizing device for 20 minutes to obtain 200 g of the adsorption regulating material for stone powder.

[0052] 3) 200 kg of gneiss powder and 200 g of adsorption regulating material were placed in a homogenizing device. After homogenization for 30 minutes, granite powder with optimized adsorption was obtained.

[0053] 4) The MB value of the granite powder after adsorption optimization was measured and found to be only 2.0 g / kg.

[0054] 5) Use the optimized granite powder to carry out concrete performance testing.

[0055] Test example

[0056] The concrete in Examples 1-3 and Comparative Examples 1-2 were used to perform performance tests, and the results are shown in Table 2. The test method is based on the "slump method" and "air content test" in GB / T 50080-2016 "Standard for Performance Test Methods of Ordinary Concrete Mixtures", and the concrete mix ratio is shown in Table 1.

[0057] Table 1 Mix ratio of stone powder based concrete

[0058] cement Modified stone powder sand Dashi Xiaoshi water Water reducing agent illustrate 294 126 742 780 333 158 4.2 Modified stone powder dosage 30%

[0059] Table 2 Air content and slump of stone powder based concrete of Examples 1-3 and Comparative Examples 1-2

[0060]

[0061] As can be seen from Table 1, the early and late working performance of stone powder concrete can only be effectively guaranteed through the effective coordination of the three components: surfactant component, complex component and anti-mud component.

[0062] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An adsorption regulating material for tunnel slag powder, characterized in that: The surface active component, the complexing component and the anti-mud component are mixed in a mass ratio of 3-7:1:0.5-5; The surfactant component is one or more of dodecyltrimethylammonium chloride, dodecyldimethylbenzylammonium chloride, and didodecyltrimethylammonium chloride; The complexing component is one or more of sodium silicate and sodium hexametaphosphate; The anti-mud component is one or more of polyethylene glycol, beta-cyclodextrin, and dimethyldiallylammonium chloride.

2. The adsorption regulating material for tunnel slag powder according to claim 1, characterized in that: The mass ratio of the surfactant component, the complexing component and the anti-mud component is 5-6:1:3-4.

3. The adsorption regulating material for tunnel slag powder according to claim 1, characterized in that: The tunnel slag powder is one or more of granite, gneiss, limestone, dolomite, slate, tuff and basalt.

4. A method for preparing modified tunnel slag powder, characterized in that: The following steps are involved: (1) Determine the rock properties of tunnel slag powder; (2) The adsorption regulating material according to any one of claims 1 to 3 is added to tunnel slag stone powder, and the amount of the adsorption regulating material is 0.02% to 2.00% of the total amount of the stone powder; (3) The mixed material is placed in a homogenizing device, mixed evenly at high speed, and then transferred to a finished product bin. After the material is cooled to a constant temperature, a modified tunnel slag powder material is obtained.

5. The method for preparing modified tunnel slag powder according to claim 4, characterized in that: The dosage of the adsorptive regulating material is determined by measuring the MB value of the tunnel slag stone powder: when 1.0g / kg<stone powder MB value≤2.0g / kg, the dosage of the adsorptive regulating material is 0.02%~0.5% of the total amount of stone powder; when 2.0g / kg<stone powder MB value≤5.0g / kg, the dosage of the adsorptive regulating material is 0.5%~1.0% of the total amount of stone powder; when 5.0g / kg<stone powder MB value≤10.0g / kg, the dosage of the adsorptive regulating material is 1.0%~2.0% of the total amount of stone powder; when the stone powder MB value>10.0g / kg, the adsorptive regulating material described in any one of claims 1-3 is no longer applicable.

6. A tunnel slag stone powder-based concrete, characterized in that: The invention comprises: cement, water, coarse aggregate, fine aggregate, admixture and modified tunnel slag stone powder material prepared by the preparation method according to claim 4 or 5.

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