Activity improving material for igneous rock mineral admixture as well as preparation method and application of activity improving material

Abstract

The invention discloses an igneous rock mineral admixture activity improving material and a preparation method and application thereof, and belongs to the technical field of civil engineering materials.The igneous rock mineral admixture activity improving material comprises a chemical excitation component, a dense reinforcing component and a surface modification component, the mass ratio of the chemical excitation component to the dense enhancement component to the surface modification component is (0.5-6): (0.5-6): 1. Aiming at lithology of igneous rocks, the activity improving material can realize activity improvement of igneous rock mineral raw materials from three directions of chemical excitation, density enhancement and surface modification.

Description

Technical Field

[0001] The invention relates to the technical field of civil engineering materials, and more particularly to an igneous rock mineral admixture activity enhancing material and a preparation method and application thereof. Background Art

[0002] Due to the backward industrial development in remote areas of western China, traditional mineral admixtures such as fly ash, slag, and silica fume are scarce, and the distance between the resource supply site and the project site is too far, and the transportation cost is very high, which greatly affects the cost and progress of project construction. The survey found that there are very considerable igneous rock mineral resources in remote mountainous areas in western my country, which have the potential to become a substitute for mineral admixtures such as fly ash, silica fume, and slag and be applied in the field of concrete engineering. Treating, grinding, and processing igneous rock mineral materials and adding them to concrete materials as mineral admixtures is a rational way to solve the uneven spatial and regional distribution of concrete mineral admixtures, which in turn affects the smooth development of concrete engineering.

[0003] At present, in many construction projects, igneous rock materials have been used in large-volume concrete for water conservancy and roads in my country, such as the Mombasa-Nairobi Railway, the Neima Railway, and the Jiyin Water Conservancy Project in Hotan, Xinjiang, etc., but their theoretical basis and application technology are still insufficient. The sources of igneous rock raw materials are complex and their reactivity varies greatly. The igneous rock raw materials in different regions have significant differences in diagenesis age and diagenetic conditions. When used in concrete projects, different igneous rock materials will show large differences in the macroscopic properties of concrete. More importantly, due to the differences in their diagenesis process, the reactivity of igneous rock materials also varies greatly. It is necessary to establish an effective method to increase the reactivity of igneous rock raw materials, improve the utilization efficiency of igneous rock raw materials, and improve the comprehensive performance of igneous rock mineral admixture concrete.

[0004] Therefore, how to develop an igneous rock mineral admixture activity enhancement material and its preparation method and application, and provide technical support for the material source of mineral admixtures in concrete engineering construction in remote western regions, is a problem that technical personnel in this field urgently need to solve. Summary of the invention

[0005] In view of this, the present invention provides an igneous rock mineral admixture activity enhancing material and a preparation method and application thereof.

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

[0007] An igneous rock mineral admixture activity enhancement material, comprising a chemical excitation component, a density enhancement component and a surface modification component, wherein the mass ratio of the chemical excitation component, the density enhancement component and the surface modification component is (0.5-6):(0.5-6):1;

[0008] The chemical excitation component is one or more of Li2SO4, Li2CO3, Na2SO4, NaOH, CaSO4, Ca(OH)2, calcium formate, sodium acetate, triethanolamine, sodium gluconate or potassium sodium tartrate;

[0009] The above-mentioned density-enhancing component is one or more of silica fume, nano-silicon dioxide, ultrafine mineral powder or calcium sulfate whisker;

[0010] The surface modification component is one or more of a silane coupling agent, an aluminate coupling agent, a phosphate coupling agent or a borate coupling agent.

[0011] Beneficial effects of the present invention: For igneous rock properties, the activity enhancement material of the present invention can enhance the activity of igneous rock mineral raw materials from three directions: chemical excitation, density enhancement, and surface modification. From the perspective of enhancing the activity of the "cement-igneous rock mineral admixture" cementitious system: (1) Chemical excitation mainly adopts the addition of chemical excitation components to change the hydration process and hydration products of the "cement-igneous rock mineral admixture" cementitious system to a certain extent, thereby enhancing the activity of the igneous rock mineral raw materials; (2) Density enhancement mainly adopts the addition of density enhancement components to refine the pore structure of the hardened slurry of the "cement-igneous rock mineral admixture" cementitious system, thereby enhancing the activity of the igneous rock mineral raw materials. (3) Surface modification mainly adopts the addition of surface modifiers to change the roughness of the surface of the igneous rock mineral raw material particles to a certain extent, increase its bonding force and bite force in the hardened slurry of the "cement-igneous rock mineral admixture" cementitious system, and enhance the activity of the igneous rock mineral raw materials.

[0012] The present invention also provides a method for preparing an igneous rock mineral admixture activity enhancing material, comprising the following steps:

[0013] (1) Weighing various raw materials according to the above-mentioned igneous rock mineral admixture activity enhancing material;

[0014] (2) The chemically excited component, the compaction enhancing component and the surface modified component are placed in a homogenizing device and mixed at a high speed. After the material is cooled to a constant temperature, the above-mentioned igneous rock mineral admixture activity enhancing material is obtained.

[0015] Beneficial effects of the present invention: The preparation method of the present invention is simple, convenient to operate, and suitable for large-scale production and application.

[0016] Furthermore, in step (2), the high-speed mixing speed is 60-120 rpm, and the mixing time is 10-30 min.

[0017] The beneficial effect of adopting the above further technical solution is that the uniformity of the mixed material can be achieved under the condition that the material does not undergo physical and chemical changes.

[0018] The present invention also provides a use of the above-mentioned active enhancement material or the active enhancement material prepared by the above-mentioned method in enhancing the activity of igneous rock mineral raw materials, comprising the following steps:

[0019] The igneous rock mineral raw material whose activity is to be improved and the above-mentioned activity improving material are placed in a homogenizing device and mixed at high speed. The mass ratio of the activity improving material to the igneous rock mineral raw material whose activity is to be improved is (5-35):100. After the material is cooled to a constant temperature, the igneous rock mineral admixture with improved activity is obtained.

[0020] The beneficial effect of the present invention is to improve the activity of igneous rock mineral raw materials.

[0021] Furthermore, the igneous rock mineral raw material to be improved in activity and the above-mentioned activity improvement material are placed in a homogenizing device and mixed at a high speed of 60-120 rpm for a mixing time of 10-30 min. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] Example 1

[0024] The method for improving the activity of tuff igneous rock mineral raw materials comprises the following steps:

[0025] The borate coupling agent of the present invention is LD-100 borate coupling agent produced by Shandong Suihua Biotechnology Co., Ltd., and its main components are boric acid, isopropanol and octadecyl alcohol.

[0026] (1) 8 kg of triethanolamine, 10 kg of nano-silicon dioxide, and 2 kg of borate coupling agent were placed in a homogenizing device and mixed at high speed for 15 min at a speed of 120 rpm. After the materials were cooled to a constant temperature, an igneous rock mineral admixture activity enhancement material was obtained.

[0027] (2) 100 kg of the igneous rock mineral raw material to be enhanced in activity and 20 kg of the active enhancement material are placed in a homogenizing device and mixed at high speed for 10 min at a mixing speed of 60 rpm.

[0028] The activity index of tuff igneous rock mineral admixture measured by mortar activity index method at 7d, 28d and 56d were 92.3%, 98.2% and 105.7% respectively.

[0029] Example 2

[0030] The method for improving the activity of rhyolite igneous rock mineral raw materials comprises the following steps:

[0031] The specific surface area of ​​the ultrafine mineral powder of the present invention is 700-800m 2 / kg, main component SiO2.

[0032] The silane coupling agent is KH-540 silane coupling agent produced by Hubei Yamade Biopharmaceutical Co., Ltd., and its main component is C6H 17 NO3Si.

[0033] (1) 5 kg of Li2CO3, 5 kg of ultrafine mineral powder, and 10 kg of silane coupling agent were placed in a homogenizing device and mixed at high speed for 15 min at a speed of 120 rpm. After the materials were cooled to a constant temperature, an igneous rock mineral admixture activity enhancement material was obtained.

[0034] (2) 70 kg of the igneous rock mineral raw material to be enhanced in activity and 20 kg of the active enhancement material are placed in a homogenizing device and mixed at high speed for 10 min at a mixing speed of 60 rpm.

[0035] The mortar activity index method was used to measure the activity index of rhyolite igneous rock mineral admixtures at 7d, 28d, and 56d, and the results were as follows:

[0036] Example 3

[0037] The method for improving the activity of basalt igneous rock mineral raw materials comprises the following steps:

[0038] The aluminate coupling agent of the present invention is a UP-801 model produced by Nanjing Youpu Chemical Co., Ltd., and its main component is distearoyloxyisopropoxyaluminate.

[0039] (1) 6 kg of CaSO4, 6 kg of silica fume, and 1 kg of aluminate coupling agent were placed in a homogenizing device and mixed at high speed for 15 min at a speed of 90 rpm. After the materials were cooled to a constant temperature, an igneous rock mineral admixture activity enhancement material was obtained.

[0040] (2) 70 kg of the igneous rock mineral raw material to be enhanced in activity and 13 kg of the active enhancement material were placed in a homogenizing device and mixed at high speed for 10 min at a mixing speed of 90 rpm.

[0041] The mortar activity index method was used to measure the activity index of basalt igneous rock mineral admixtures at 7d, 28d, and 56d, and the results were as follows:

[0042] The national standard referred to in the mortar activity index method of the present invention is "Limestone Powder Concrete" (GB / T30190-2013).

[0043] Effect experiment

[0044] The method for improving the activity of tuff igneous rock mineral raw materials comprises the following steps:

[0045] The borate coupling agent of the present invention is LD-100 borate coupling agent produced by Shandong Suihua Biotechnology Co., Ltd., and its main components are boric acid, isopropanol and octadecyl alcohol.

[0046] (1) Triethanolamine, nano-silica, and borate coupling agent are placed in a homogenizing device and mixed at high speed for 15 minutes at a speed of 120 revolutions per minute. After the materials are cooled to a constant temperature, an igneous rock mineral admixture activity enhancement material is obtained.

[0047] (2) The igneous rock mineral raw materials to be enhanced in activity and the activity enhancing materials are placed in a homogenizing device and mixed at high speed for 10 minutes at a mixing speed of 60 rpm.

[0048] The 7d, 28d, and 56d activity indices of igneous rock mineral admixtures of different groups and numbers were measured using the mortar activity index method, as shown in Table 1.

[0049] Table 1 Design formula of different igneous rock mineral raw materials and active enhancement materials (unit: kg)

[0050]

[0051]

[0052] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An igneous rock mineral admixture activity enhancing material, characterized in that: It comprises a chemical excitation component, a density enhancement component and a surface modification component, wherein the mass ratio of the chemical excitation component, the density enhancement component and the surface modification component is (0.5-6):(0.5-6):1; The chemical excitation component is one or more of Li2SO4, Li2CO3, Na2SO4, NaOH, CaSO4, Ca(OH)2, calcium formate, sodium acetate, triethanolamine, sodium gluconate or potassium sodium tartrate; The compaction reinforcement component is one or more of silica fume, nano silicon dioxide, ultrafine mineral powder or calcium sulfate whisker; The surface modification component is one or more of a silane coupling agent, an aluminate coupling agent, a phosphate coupling agent or a borate coupling agent.

2. A method for preparing an igneous rock mineral admixture activity enhancing material, characterized in that: The steps include: (1) Weighing the raw materials of the igneous rock mineral admixture activity enhancing material according to claim 1; (2) The chemically excited component, the compaction enhancing component and the surface modified component are placed in a homogenizing device and mixed at a high speed. After the material is cooled to a constant temperature, the igneous rock mineral admixture activity enhancing material is obtained.

3. The method for preparing an igneous rock mineral admixture activity enhancing material according to claim 2, characterized in that: In step (2), the high-speed mixing speed is 60-120 rpm, and the mixing time is 10-30 min.

4. Use of the active enhancement material according to claim 1 or the active enhancement material prepared by the method according to claim 2 or 3 in enhancing the activity of igneous rock mineral raw materials, characterized in that: The steps include: The igneous rock mineral raw material whose activity is to be improved and the activity improving material are placed in a homogenizing device and mixed at a high speed. The mass ratio of the activity improving material to the igneous rock mineral raw material whose activity is to be improved is (5-35):

100. After the material is cooled to a constant temperature, the igneous rock mineral admixture with improved activity is obtained.

5. The use of the active enhancement material according to claim 4 or the active enhancement material prepared by the method in enhancing the activity of igneous rock mineral raw materials, characterized in that: The igneous rock mineral raw material to be improved in activity and the activity improvement material are placed in a homogenizing device and mixed at a high speed of 60-120 rpm for a mixing time of 10-30 min.

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