Tunnel hole slag stone powder adsorptive control material and application thereof

Abstract

The application discloses a kind of adsorptive control materials for tunnel hole slag stone powder and application.The adsorptive control material is mixed by surface active component, complex component, anti-mud component three components according to 3-7:1:0.5-5 mass ratio;The surface active component is one or more of dodecyltrimethylammonium chloride, dodecyl dimethyl benzyl ammonium chloride, didodecyltrimethylammonium chloride;The complex component is one or more of sodium silicate, sodium hexametaphosphate;The anti-mud component is one or more of polyethylene glycol, β-cyclodextrin, dimethyl diallyl ammonium chloride.The adsorptive control material can improve the adsorption of tunnel hole slag stone powder, ensure the working performance of concrete.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of civil engineering materials, and particularly relates to an adsorption-regulating material for tunnel hole slag stone powder and application thereof. BACKGROUND

[0002] With the rapid development of major engineering construction such as high-speed railway, highway and underground railway in China, the number of tunnel projects is increasing. Tunnel hole slag stone powder, as the raw material of tunnel hole slag mechanism aggregate and stone powder mineral admixture for concrete, has a huge yield in the tunnel construction process. So far, the tunnel hole slag stone powder has been preliminarily applied in concrete engineering. The crystal nucleus effect, filling effect, chemical effect and dilution effect of stone powder in concrete can improve the compactness of cement matrix and interface transition zone to a certain extent, and have the effects of promoting the growth and precipitation of early hydration products and adjusting the hydration heat release rate.

[0003] However, in actual engineering, it is found that the concrete mixed with stone powder has poor workability. The high adsorption of stone powder is related to the mineral composition and structure of the parent rock, the surface charge distribution of the stone powder, and the like. For example, granite, tuff and gneiss often contain minerals such as quartz, feldspar and mica. These minerals can adsorb a large amount of water reducing agent, resulting in poor workability and large slump loss of concrete. On the other hand, a certain amount of clay is often contained in stone powder, such as montmorillonite, kaolinite and illite. The layered structure of clay materials has higher surface energy, which is easy to adsorb water reducing agent, thereby affecting the workability of concrete.

[0004] Therefore, how to effectively regulate the adsorption of stone powder without affecting the mechanical properties and durability of concrete is a technical problem to be solved, which is of great significance for the large-scale utilization of tunnel hole slag stone powder. SUMMARY

[0005] In view of the above, the application provides an adsorption-regulating material for tunnel hole slag stone powder and a use method thereof, which can solve the engineering problems of poor workability and large slump loss of concrete caused by the large adsorption of tunnel hole slag stone powder, and provide technical support for the resource utilization of tunnel engineering hole slag.

[0006] To achieve the above purpose, the application adopts the following technical scheme:

[0007] An adsorption-regulating material for tunnel hole slag stone powder is prepared by mixing a surface active component, a complex component and an anti-mud component in a mass ratio of 5-6:1:3-4.

[0008] The surface active component is one or more of dodecyltrimethylammonium chloride, dodecyldimethylbenzylammonium chloride and didodecyltrimethylammonium chloride.

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

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

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

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

[0013] The application also provides a preparation method of modified tunnel hole slag stone powder, comprising the following steps:

[0014] (1) determining the lithology of the tunnel hole slag stone powder;

[0015] (2) incorporating the adsorptive control material of any one of claims 1-3 into the tunnel hole slag stone powder, and the incorporation amount is 0.02%-2.00% of the total amount of the stone powder;

[0016] (3) placing the above-mentioned mixed material into a homogenizing device, uniformly mixing at high speed, and then transferring to a finished product bin, and obtaining the modified tunnel hole slag stone powder material after the material is lowered to a constant temperature.

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

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

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

[0020] By incorporating the surface active component, the complexing component, and the anti-mud component, the application realizes the competitive adsorption effect, strong dispersion effect, adsorption complexation effect of various typical groups such as silicic acid, phosphoric acid, methyl phosphoric acid, ester group, sulfonic acid, and carboxylic acid group, and the synergistic dispersion effect between different components. DETAILED DESCRIPTION

[0021] Embodiments of the present application are described below, which are intended to explain the present application, and are not to be understood as limiting the present application.

[0022] Example 1:

[0023] A preparation method of a tunnel hole slag stone powder-based concrete, the specific steps are as follows:

[0024] 1) 100 kg of tunnel hole slag stone powder of gneiss rock is measured, the specific surface area of the stone powder is 572 m 2 / kg, and the MB value of the stone powder before the adsorption optimization is measured to be 3.0 g / kg.

[0025] 2) 350 g of dodecyl trimethyl ammonium chloride powder, 70 g of sodium silicate powder, and 280 g of β-cyclodextrin powder are weighed, and after being homogenized in a homogenization device for 20 minutes, 200 g of adsorption regulation material for the stone powder is obtained.

[0026] 3) The 100 kg of gneiss stone powder and 700 g of adsorption regulation material are placed into the homogenization device, and after being homogenized for 30 minutes, the gneiss stone powder after the adsorption optimization is obtained.

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

[0028] Example 2:

[0029] A preparation method of a tunnel hole slag stone powder-based concrete, the specific steps are as follows:

[0030] 1) 200 kg of tunnel hole slag stone powder of granite rock is measured, the specific surface area of the stone powder is 466 m 2 / kg, and the MB value of the stone powder before the adsorption optimization is measured to be 2.5 g / kg.

[0031] 2) 360 g of didodecyl trimethyl ammonium chloride powder, 360 g of dodecyl trimethyl ammonium chloride powder, 120 g of sodium hexametaphosphate, and 360 g of polyethylene glycol powder are weighed, and after being homogenized in a homogenization device for 20 minutes, 1.2 kg of adsorption regulation material for the stone powder is obtained.

[0032] 3) The 200 kg of gneiss stone powder and 1.2 kg of adsorption regulation material are placed into the homogenization device, and after being homogenized for 30 minutes, the granite stone powder after the adsorption optimization is obtained.

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

[0034] Example 3:

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

[0036] 1) 200 kg of tunnel hole slag stone powder of granite lithology was measured, and the specific surface area of the stone powder was 594 m2 / kg. The MB value of the stone powder before optimization of adsorption 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 after homogenization in a homogenization device for 20 minutes, 3 kg of adsorption regulating material for stone powder was obtained.

[0038] 3) The gneiss stone powder 200 kg and the adsorption regulating material 3 kg were placed into the homogenization device, and after homogenization for 30 minutes, the granite stone powder with optimized adsorption was obtained.

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

[0040] 5) The optimized granite stone powder was used to carry out concrete performance test.

[0041] Comparative Example 1:

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

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

[0044] 2) 550 g of dodecyltrimethylammonium chloride powder and 150 g of β-cyclodextrin powder were weighed, and after homogenization in a homogenization device for 20 minutes, 700 g of adsorption regulating material for stone powder was obtained.

[0045] 3) The gneiss stone powder 100 kg and the adsorption regulating material 700 g were placed into the homogenization device, and after homogenization for 30 minutes, the gneiss stone powder with optimized adsorption was obtained.

[0046] 4) The MB value of the stone powder with optimized adsorption was measured to be 2.5 g / kg.

[0047] 5) The optimized granite stone powder was used to carry out concrete performance test.

[0048] Comparative Example 2:

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

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

[0051] 2) 10 g of didodecyltrimethylammonium chloride powder, 40 g of dodecyltrimethylammonium chloride powder, 20 g of sodium hexametaphosphate, and 130 g of polyethylene glycol powder are weighed, and after homogenization in a homogenization device for 20 minutes, 200 g of adsorption regulating material for stone powder is obtained.

[0052] 3) The gneiss stone powder 200 kg and the adsorption regulating material 200 g are placed in a homogenization device, and after homogenization for 30 minutes, the granite stone powder with optimized adsorption is obtained.

[0053] 4) The MB value of the granite stone powder with optimized adsorption is measured to be only 2.0 g / kg.

[0054] 5) The optimized granite stone powder is used to carry out concrete performance test.

[0055] Test Example

[0056] The concrete in Examples 1-3 and Comparative Examples 1-2 is respectively subjected to performance test, and the results are shown in Table 2. The test method is according to the "slump method" and "air content test" in GB / T 50080-2016 "Standard for Test Methods of Performance of Ordinary Concrete Mixture", and the concrete mix proportion is shown in Table 1.

[0057] Table 1: Mix proportion of stone powder-based concrete

[0058] Cement Modified stone dust Sand Large stone Small stone Water Water reducing agent Explanation 294 126 742 780 333 158 4.2 Modified stone dust content 30%

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

[0060]

[0061] As can be seen from Table 1, the effective coordination of the three components of surface active component, complexing component, and anti-mud component can effectively guarantee the early and late working performance of stone powder concrete.

[0062] The above examples are only used to illustrate the technical solutions of the present application, and are not limiting; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that the technical solutions described in the foregoing examples can be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A kind of adsorptive control material for tunnel hole slag stone powder, it is characterized in that, The three components of 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 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, β-cyclodextrin, and dimethyl diallyl ammonium chloride.

2. The adsorptive regulating material according to claim 1, wherein the adsorptive regulating material is characterized by, The mass ratio of the three components of the surface active component, the complexing component, and the anti-mud component is 5-6:1:3-4.

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

4. A method for preparing a modified tunnel hole slag stone powder, characterized by, The method comprises the following steps: (1) determining the lithology of the tunnel hole slag stone powder; (2) adding the adsorptive control material of any one of claims 1-3 to the tunnel hole slag stone powder, with the addition amount being 0.02%-2.00% of the total amount of the stone powder; (3) placing the mixture into a homogenizing device, mixing at high speed, and then transferring to a finished product bin, and obtaining the modified tunnel hole slag stone powder material after the material is cooled to a constant temperature.

5. The method of claim 4, wherein the modified tunneling slag stone powder is prepared by the steps of: mixing a tunneling slag stone powder with a binder; and drying the mixture. The addition amount of the adsorptive control material is determined by measuring the MB value of the tunnel hole slag stone powder: when 1.0g / kg<MB value of the stone powder≤2.0g / kg, the addition amount of the adsorptive control material is 0.02%-0.5% of the total amount of the stone powder; when 2.0g / kg<MB value of the stone powder≤5.0g / kg, the addition amount of the adsorptive control material is 0.5%-1.0% of the total amount of the stone powder; when 5.0g / kg<MB value of the stone powder≤10.0g / kg, the addition amount of the adsorptive control material is 1.0%-2.0% of the total amount of the stone powder; and when the MB value of the stone powder>10.0g / kg, the adsorptive control material of any one of claims 1-3 is no longer applicable.

6. A tunnel muck stone dust based concrete, characterized in that, The cement, water, coarse aggregate, fine aggregate, additive, and the modified tunnel hole slag stone powder material prepared by the preparation method of claim 4 or 5.

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