阅读说明：本技术 混凝土矿物掺合料 (Mineral admixture for concrete ) 是由 苏宇 年稼宸 刘学理 于 2021-10-19 设计创作，主要内容包括：本发明涉及一种混凝土矿物掺合料,以重量份数计,包括粒化高炉矿渣800-900份、脱硫石膏30-50份、石灰石30-50份、活性激发剂5-10份、添加剂2-5份；所述活性激发剂选自碱金属的硫酸盐、碱金属的硅酸盐、碱金属的磷酸盐、碱金属的草酸盐、碱金属的甲酸盐或碱金属的氢氧化物。本发明申请的混凝土矿物掺合料在常温环境下,以水为传质介质和反应介质,促使固废矿渣结晶相和玻璃相聚合体的解体,生成更多富含钙的连续相,使得固废矿渣的水化加速,表现出优异的水硬性活性。还兼具有机高聚物的特点,能快速破坏固废矿渣玻璃体的表面结构,使水分更易于渗入并进行水化反应,促使矿渣颗粒的分散和解体,有利于水化物网络结构的形成。(The invention relates to a concrete mineral admixture which comprises 900 parts by weight of granulated blast furnace slag 800-one, 30-50 parts by weight of desulfurized gypsum, 30-50 parts by weight of limestone, 5-10 parts by weight of active excitant and 2-5 parts by weight of additive; the activity activator is selected from alkali metal sulfate, alkali metal silicate, alkali metal phosphate, alkali metal oxalate, alkali metal formate or alkali metal hydroxide. The concrete mineral admixture provided by the invention uses water as a mass transfer medium and a reaction medium under a normal temperature environment, promotes the disintegration of solid waste slag crystalline phase and glass phase polymer, generates more continuous phases rich in calcium, accelerates the hydration of the solid waste slag, and shows excellent hydraulic activity. The method also has the characteristics of organic high polymer, can quickly destroy the surface structure of the solid waste slag vitreous body, enables water to be easier to permeate and carry out hydration reaction, promotes the dispersion and disintegration of slag particles, and is beneficial to the formation of hydrate network structure.)

1. The concrete mineral admixture is characterized by comprising 900 parts by weight of granulated blast furnace slag, 30-50 parts by weight of desulfurized gypsum, 30-50 parts by weight of limestone, 5-10 parts by weight of active excitant and 2-5 parts by weight of additive; the activity activator is selected from alkali metal sulfate, alkali metal silicate, alkali metal phosphate, alkali metal oxalate, alkali metal formate or alkali metal hydroxide.

2. The concrete mineral admixture according to claim 1, wherein the additive is selected from at least one of alkali metal halides, carbonates, sulfates, amines and alcamines, silicate alkali metals or alkali metal halides.

3. The concrete mineral admixture according to claim 2, wherein said carbonate is lithium carbonate, sodium carbonate, potassium carbonate or calcium carbonate and said sulfate is lithium sulfate, sodium sulfate, potassium sulfate or calcium sulfate.

4. The concrete mineral admixture according to claim 2, wherein said amine and alcohol amine is selected from at least one of ethylenediamine, diisopropanolamine or triethanolamine.

Technical Field

The invention relates to the field of building material additives, in particular to a mineral admixture for concrete.

Background

From the perspective of high-efficiency application of resources and environmental protection, comprehensive utilization of industrial solid wastes is greatly promoted. The key points are high-valued, normalized and intensive utilization, and deep resource utilization is promoted for industrial solid wastes such as tailings, fly ash and smelting slag. Solid waste engineering has developed into an emerging technical subject, and promotes the development of green industry and the secondary utilization of solid waste resources.

The invention belongs to the solid waste treatment technology of metallurgical slag, coal ash and the like, can be widely applied to the technical field of building materials, and can be used for treating various industrial waste residues and coal ash (applicable to various waste residues of industrial waste residue standards in cement and concrete); the concrete mineral admixture prepared by the method has the characteristics of excellent working performance, lower density, ultrahigh strength, good volume stability, low heat of hydration and the like, improves the durability of a concrete structure, has the sulfate erosion resistance, has the performance that the strength progressive rate is permanently superior to the cement strength progressive rate, and has important practical application value.

Disclosure of Invention

In view of the above, there is a need to provide a mineral admixture for concrete which addresses at least one of the problems mentioned above.

The concrete mineral admixture provided by the invention comprises 900 parts by weight of granulated blast furnace slag 800-50 parts by weight of desulfurized gypsum, 30-50 parts by weight of limestone, 5-10 parts by weight of active excitant and 2-5 parts by weight of additive; the activity activator is selected from alkali metal sulfate, alkali metal silicate, alkali metal phosphate, alkali metal oxalate, alkali metal formate or alkali metal hydroxide.

In one embodiment, the additive is selected from the group consisting of alkali metal halides, carbonates, sulfates,Amines withAt least one of an alkanolamine, a silicate alkali metal, or an alkali metal halide.

In one embodiment, the carbonate is lithium carbonate, sodium carbonate, potassium carbonate or calcium carbonate, and the sulfate is lithium sulfate, sodium sulfate, potassium sulfate or calcium sulfate.

In one embodiment, the amine and alcohol amine is at least one selected from ethylenediamine, diisopropanolamine or triethanolamine.

The technical scheme provided in the application embodiment of the invention has the following beneficial technical effects:

the concrete mineral admixture provided by the invention uses water as a mass transfer medium and a reaction medium under a normal temperature environment, promotes the disintegration of solid waste slag crystalline phase and glass phase polymer, generates more continuous phases rich in calcium, accelerates the hydration of the solid waste slag, and shows excellent hydraulic activity. The method also has the characteristics of organic high polymer, can quickly destroy the surface structure of the solid waste slag vitreous body, enables water to be easier to permeate and carry out hydration reaction, promotes the dispersion and disintegration of slag particles, and is beneficial to the formation of hydrate network structure.

Additional aspects and advantages of the present invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Detailed Description

In order that the invention may be more fully understood, reference will now be made to the following description. Possible embodiments of the invention are given. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. The described embodiments are illustrative for the purposes of promoting a thorough understanding of the present disclosure and are not to be construed as limiting the present invention. Furthermore, if a detailed description of known technologies is not necessary for illustrating the features of the present invention, such technical details may be omitted.

It will be understood by those skilled in the relevant art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It is to be understood that the term "and/or" as used herein is intended to include all or any and all combinations of one or more of the associated listed items.

The concrete mineral admixture provided by the invention comprises 900 parts by weight of granulated blast furnace slag 800-one, 30-50 parts by weight of desulfurized gypsum, 30-50 parts by weight of limestone, 5-10 parts by weight of high-activity excitant and 2-5 parts by weight of additive; the high-activity activator is selected from alkali metal sulfate, alkali metal silicate, alkali metal phosphate, alkali metal oxalate, alkali metal formate or alkali metal hydroxide. Optionally, the additive is selected from at least one of alkali metal halides, carbonates, sulfates, alkaline materials of amines, alkali metal silicates or alkali metal hydroxides.

Optionally, in an implementation manner of the present application, the carbonate is lithium carbonate, sodium carbonate, potassium carbonate, or calcium carbonate, and the sulfate is lithium sulfate, sodium sulfate, potassium sulfate, or calcium sulfate. Optionally, the activity activator is prepared from one or more raw materials in the first claim and the second claim.

In conventional concrete, about 20% of the total cementitious material (e.g., building materials such as cement and mineral admixtures) suffers from insufficient hydration, and this portion of the cementitious material serves only as a filler and is the largest cost waste in concrete applications. The mineral admixture for the concrete provided by the application sufficiently participates in hydration reaction of the cementing material under the action of chemical excitation, plays a role in activating the cementing material, improves the hydration degree of the mineral admixture mainly comprising solid wastes, increases the generation amount of set cement providing strength and durability, improves the workability and the homogeneity of the concrete, reduces the bleeding problem, enables the concrete to maintain or exceed the standard strength which can be achieved without using the mineral admixture for the concrete provided by the application, and reduces the using amount of the cement (the using amount is reduced by 10% -15%).

The concrete mineral admixture provided by the application is doped with a large amount of uniformly dispersed amorphous SiO₂Seed crystal, SiO₂、Ca、Fe₂O₃、Al₂O₃The mineral seed crystals have the function of nucleating the central substance, can be used as the central substance of the microcosmic hydration reaction, promote the formation of crystal nuclei of the set cement, increase the total amount of the set cement and contribute to reducing microcosmic defects, thereby greatly improving the strength of the concrete.

In addition, the concrete mineral admixture provided by the application has an activating effect on vitreous minerals (such as various industrial ash residues) in cement and mineral admixtures, promotes the hydration reaction degree of the materials, activates some inert cementing materials, forms more set cement, namely C-S-H calcium silicate gel, and improves the concrete strength, namely shows the improvement of the activity of the mineral admixture.

Compared with the similar technology, the invention has the following advantages:

(1) the method can quickly destroy the surface structure of the solid waste slag vitreous body, so that water is easier to permeate and carry out hydration reaction, slag particles are promoted to disperse and disintegrate, and the formation of a hydrate network structure is facilitated. The formation of cementitious calcium silicate hydrate and calcium aluminate hydrate products is increased and strength is produced.

(2) The method can rapidly dissociate the glass-shaped silica network in the solid waste slag, accelerate the hydration reaction, and rapidly react the water-containing silica gel with calcium ions and aluminum ions obtained from the slag to generate C-S-H gel, promote the hydrolysis of the slag and participate in the hydration reaction of the base material.

(3) Simple formula, low price of raw materials, abundant reserves, convenient operation of production process and no environmental pollution.

(4) The material has the characteristic of high temperature resistance, has better rapid hardening and concreting performance, and is coagulated and solidified in a normal temperature environment.

(5) Can greatly reduce the stockpiling amount of solid waste slag, changes waste into valuable and is widely applied to building concrete.

(6) It is suitable for reducing cement greatly (equal amount of cement can be replaced by 70%) and treating industrial ash greatly.

The active excitant is utilized to effectively treat active substances and potential active substances which are separated out in the hydration process of cement and admixture and have certain active substances and potential active substances to promote the active addition hydration reaction of the cement and the admixture to change the cement and the admixture into a very stable cement stone structure, the potential activity of the mineral admixture is effectively excited to achieve a high-quality composite admixture, a great amount of cement is replaced, part of excellent performances of concrete are improved, and different optimization schemes can be adopted according to different mineral raw material components.

The following are specific examples:

example 1

Table 1 concrete mineral admixture formulation one

Jointly grinding a mixture consisting of the ingredients to reach the specific surface area of 447cm²/g。

Using and operating criteria: GB/T51003-2014 mineral admixture application technical specifications are shown in the table, wherein reference cement (100%) represents that the proportion of the reference cement in the cementing material is 100%, slag micro powder (50%) represents that the proportion of the slag micro powder in the cementing material is 50%, and the balance is the reference cement. The mineral admixture (50%) represents 50% of mineral admixture in the cementing material, and the balance is the benchmark cement.

Table 2 raw material performance test results of standard mortar test

Example 2

Table 3: proportioning scheme two of concrete mineral admixture

	Reference cement	Slag micropowder	Lithium slag micro powder	Fly ash	Active excitant
						Reference group	100％	——	——	——	——
Admixture (Biduet)	——	80％	8％	12％	0％
						Admixture (synergy)	——	80％	8％	11％	1％

Jointly grinding the mixture consisting of the ingredients to a specific surface area of 453cm²/g。

Using and operating criteria:

GB/T51003-; fly ash (30%) represents 70% of the basis cement in the cementitious material, and mineral admixture (50%) represents 50% of the basis cement in the cementitious material.

Table 4 raw material performance test results of standard mortar test

The two groups of data are selected from relatively representative synergistic effects, belong to average level and have higher economical dosing schemes, the synergistic effects of the admixtures can be properly adjusted by adjusting the proportioning of the concrete mineral admixtures and the dosing schemes of the admixtures so as to meet the requirements of users, although the results are different due to different matching of similar materials and auxiliary materials through data analysis, larger deviation sometimes occurs due to different components of the materials and the auxiliary materials in each area, and certain positive and negative deviation occurs in the synergistic results.

The concrete mineral admixture provided by the invention uses water as a mass transfer medium and a reaction medium under a normal temperature environment, promotes the disintegration of solid waste slag crystalline phase and glass phase polymer, generates more continuous phases rich in calcium, accelerates the hydration of the solid waste slag, and shows excellent hydraulic activity. The method also has the characteristics of organic high polymer, can quickly destroy the surface structure of the solid waste slag vitreous body, enables water to be easier to permeate and carry out hydration reaction, promotes the dispersion and disintegration of slag particles, and is beneficial to the formation of hydrate network structure.

Those of skill in the art will appreciate that the various operations, methods, steps in the processes, acts, or solutions discussed in this application can be interchanged, modified, combined, or eliminated. Further, other steps, measures, or schemes in various operations, methods, or flows that have been discussed in this application can be alternated, altered, rearranged, broken down, combined, or deleted. Further, steps, measures, schemes in the prior art having various operations, methods, procedures disclosed in the present application may also be alternated, modified, rearranged, decomposed, combined, or deleted.

In the description herein, particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

The foregoing is only a partial embodiment of the present application, and it should be noted that, for those skilled in the art, several modifications and decorations can be made without departing from the principle of the present application, and these modifications and decorations should also be regarded as the protection scope of the present application.