Concrete additive with water reducing and retarding functions and concrete prepared from concrete additive

Abstract

The invention discloses a concrete additive with water reducing and retarding functions and concrete prepared from the concrete additive, and belongs to the field of concrete admixtures, the additive is prepared from a water reducing agent, a retarder and a hydrophilic colloid according to the mass ratio of 1: 1: (1-5); the water reducing agent is a mixed component of a naphthalene sulfonate formaldehyde condensate and polycarboxylic acid, and the naphthalene sulfonate formaldehyde condensate and the polycarboxylic acid are mixed according to the mass percent of 2: 1; the hydrophilic colloid is modified agar; the additive prepared by the invention can effectively improve the overall water-reducing rate of concrete, so that the water-reducing rate can reach 38%; meanwhile, the setting time of the concrete is also prolonged, the flowability of the concrete is ensured, and the problem of difficult transportation caused by rapid setting after concrete production is avoided.

Description

Technical Field

[0001] The invention relates to the field of concrete admixtures, and in particular to a concrete additive with water-reducing and slow-setting functions and concrete prepared therefrom. Background Art

[0002] As early as the early 1930s, the United States added sulfite pulp waste liquid to concrete to improve the workability, strength and durability of concrete. In recent years, the high-efficiency water-reducing agent used in my country has developed rapidly. The research and application of high-efficiency water-reducing agent has promoted the development of concrete towards high strengthening, fluidization and high performance.

[0003] Additives in concrete, also called admixtures, are substances added to the concrete before or during mixing to improve the performance of concrete. Since admixtures can effectively improve the performance of concrete and have good economic benefits, they are widely used in many countries. Their application in engineering is increasingly valued and has become an indispensable material in concrete. Among them, retarding water-reducing agent is a kind of concrete admixture, which can delay the setting time of concrete, so that the fresh concrete can maintain plasticity for a longer time, facilitate pouring, and improve construction efficiency. Improving the water reduction rate of concrete and extending the retarding time are quality indicators for the use of concrete. To this end, the present invention proposes a concrete additive with water-reducing and retarding function and concrete prepared therefrom to solve the defects and shortcomings of the prior art. Summary of the invention

[0004] In view of the above problems, the present invention proposes a concrete additive with water-reducing and retarding function and concrete prepared therefrom.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions:

[0006] A concrete additive with water-reducing and retarding functions, the additive being made of a water reducer, a retarder and a hydrophilic colloid in a mass ratio of 1:1:(1-5);

[0007] The water reducer is a mixed component of naphthalenesulfonate formaldehyde condensate and polycarboxylic acid, and the naphthalenesulfonate formaldehyde condensate and polycarboxylic acid are mixed in a mass percentage of 2:1;

[0008] Wherein, the hydrophilic colloid is modified agar.

[0009] Preferably, the retarder is at least one of phosphate and citrate.

[0010] Preferably, the preparation method of the modified agar is: soaking agar in hydrogen peroxide, then filtering and drying, then soaking in ethanol solution, and finally washing with clean water, filtering and drying to obtain the modified agar.

[0011] Preferably, the concrete is made of the following raw materials in parts by weight:

[0012] 400-800 parts of cementitious materials, 2-3 parts of additives, 650-1350 parts of crushed stone, 80-140 parts of water, 30-55 parts of organic fiber debris;

[0013] Preferably, the concrete raw materials are prepared in the following weight parts: 600 parts of cementitious material, 2.5 parts of additives, 950 parts of crushed stone, 105 parts of water, and 40 parts of organic fiber chips.

[0014] Preferably, the cementitious material is composed of a mixture of gypsum, fly ash and cement; the mass percentage of the gypsum, fly ash and cement is: 2:1:(8-15).

[0015] Preferably, the mass percentage of gypsum, fly ash and cement is 2:1:11.

[0016] Due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0017] The additive prepared by the present invention can effectively improve the overall water reduction rate of concrete, so that the water reduction rate can reach 38%;

[0018] The present invention also prolongs the setting time of concrete, ensures the fluidity of concrete, and avoids the problem of difficult transportation caused by rapid setting of concrete after production;

[0019] Through the proportioning of the specific components of the additive raw materials of the present invention, the mass ratio of the water reducer, the retarder and the hydrophilic colloid is 1:1:3, and the water reduction rate and retarding time of the concrete are optimal. DETAILED DESCRIPTION

[0020] To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in combination with the embodiments of the present invention. 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.

[0021] Embodiment 1:

[0022] The concrete additive with water-reducing and slow-setting function in this embodiment 1 is composed of the following raw materials:

[0023] Water reducing agent: naphthalenesulfonate formaldehyde condensate and polycarboxylic acid are mixed in a mass percentage of 2:1;

[0024] Retarder: phosphate, citrate;

[0025] Hydrophilic colloid: modified agar;

[0026] Among them, the mass ratio of water reducer, retarder and hydrophilic colloid is 1:1:3.

[0027] The modified agar preparation steps are as follows: firstly, soaking in hydrogen peroxide, then filtering and drying, then soaking in ethanol solution, and finally washing with clean water, filtering and drying to obtain the modified agar.

[0028] The concrete of this embodiment 1 is made of the raw materials in parts by weight shown in the following table:

[0029]

[0030] Among them, the cementitious material is a mixture of gypsum, fly ash and cement;

[0031] Among them, the mass percentage of gypsum, fly ash and cement is: 2:1:11.

[0032] Embodiment 2:

[0033] The concrete additive with water-reducing and slow-setting function in this embodiment 2 is composed of the following raw materials:

[0034] Water reducing agent: naphthalenesulfonate formaldehyde condensate and polycarboxylic acid are mixed in a mass percentage of 2:1;

[0035] Retarder: phosphate, citrate;

[0036] Hydrophilic colloid: modified agar;

[0037] Among them, the mass ratio of water reducer, retarder and hydrophilic colloid is 1:1:1.

[0038] The modified agar preparation steps are as follows: firstly, soaking in hydrogen peroxide, then filtering and drying, then soaking in ethanol solution, and finally washing with clean water, filtering and drying to obtain the modified agar.

[0039] The concrete of Example 2 is made of the raw materials in parts by weight shown in the following table:

[0040]

[0041] Among them, the cementitious material is a mixture of gypsum, fly ash and cement;

[0042] Among them, the mass percentage of gypsum, fly ash and cement is: 2:1:8.

[0043] Embodiment 3:

[0044] The concrete additive with water-reducing and slow-setting function in this embodiment 3 is composed of the following raw materials:

[0045] Water reducing agent: naphthalenesulfonate formaldehyde condensate and polycarboxylic acid are mixed in a mass percentage of 2:1;

[0046] Retarder: phosphate, citrate;

[0047] Hydrophilic colloid: modified agar;

[0048] Among them, the mass ratio of water reducer, retarder and hydrophilic colloid is 1:1:2.

[0049] The modified agar preparation steps are as follows: firstly, soaking in hydrogen peroxide, then filtering and drying, then soaking in ethanol solution, and finally washing with clean water, filtering and drying to obtain the modified agar.

[0050] The concrete of this embodiment 3 is made of the raw materials in parts by weight shown in the following table:

[0051]

[0052] Among them, the cementitious material is a mixture of gypsum, fly ash and cement;

[0053] Among them, the mass percentage of gypsum, fly ash and cement is: 2:1:10.

[0054] Embodiment 4:

[0055] The concrete additive with water-reducing and slow-setting function in this embodiment 4 is composed of the following raw materials:

[0056] Water reducing agent: naphthalenesulfonate formaldehyde condensate and polycarboxylic acid are mixed in a mass percentage of 2:1;

[0057] Retarder: phosphate, citrate;

[0058] Hydrophilic colloid: modified agar;

[0059] Among them, the mass ratio of water reducer, retarder and hydrophilic colloid is 1:1:4.

[0060] The modified agar preparation steps are as follows: firstly, soaking in hydrogen peroxide, then filtering and drying, then soaking in ethanol solution, and finally washing with clean water, filtering and drying to obtain the modified agar.

[0061] The concrete of this embodiment 4 is made of the raw materials in parts by weight shown in the following table:

[0062]

[0063] Among them, the cementitious material is a mixture of gypsum, fly ash and cement;

[0064] Among them, the mass percentage of gypsum, fly ash and cement is: 2:1:12.

[0065] Embodiment 5:

[0066] The concrete additive with water-reducing and slow-setting function in this embodiment 5 is composed of the following raw materials:

[0067] Water reducing agent: naphthalenesulfonate formaldehyde condensate and polycarboxylic acid are mixed in a mass percentage of 2:1;

[0068] Retarder: phosphate, citrate;

[0069] Hydrophilic colloid: modified agar;

[0070] Among them, the mass ratio of water reducer, retarder and hydrophilic colloid is 1:1:5.

[0071] The modified agar preparation steps are as follows: firstly, soaking in hydrogen peroxide, then filtering and drying, then soaking in ethanol solution, and finally washing with clean water, filtering and drying to obtain the modified agar.

[0072] The concrete of this embodiment 5 is made of the raw materials in parts by weight shown in the following table:

[0073]

[0074] Among them, the cementitious material is a mixture of gypsum, fly ash and cement;

[0075] Among them, the mass percentage of gypsum, fly ash and cement is: 2:1:15.

[0076] Comparative Example 1

[0077] The concrete additive with water-reducing and retarding function in this comparative example 1 is composed of the following raw materials: water reducer: naphthalenesulfonate formaldehyde condensate and polycarboxylic acid mixed in a mass percentage of 2:1; retarder: phosphate and citrate;

[0078] Among them, the mass ratio of water reducer to retarder is 1:1.

[0079] The raw materials for preparing the concrete of this comparative example 1 are:

[0080]

[0081] Among them, the cementitious material is a mixture of gypsum, fly ash and cement;

[0082] Among them, the mass percentage of gypsum, fly ash and cement is: 2:1:15.

[0083] Comparative Example 2

[0084] The concrete additive with water-reducing and slow-setting function in this comparative example 2 is composed of the following raw materials: water reducing agent: naphthalenesulfonate formaldehyde condensate and polycarboxylic acid are mixed in a mass percentage of 2:1;

[0085] Retarder: phosphate, citrate;

[0086] Hydrophilic colloid: modified agar;

[0087] Among them, the mass ratio of water reducer, retarder and hydrophilic colloid is 2:1:3.

[0088] The modified agar preparation steps are as follows: firstly, soaking in hydrogen peroxide, then filtering and drying, then soaking in ethanol solution, and finally washing with clean water, filtering and drying to obtain the modified agar.

[0089] The concrete of this comparative example 2 is made of the raw materials in parts by weight shown in the following table:

[0090]

[0091] Among them, the cementitious material is a mixture of gypsum, fly ash and cement;

[0092] Among them, the mass percentage of gypsum, fly ash and cement is: 2:1:15.

[0093] Comparative Example 3

[0094] The concrete additive with water-reducing and slow-setting function in this comparative example 3 is composed of the following raw materials:

[0095] Water reducing agent: naphthalenesulfonate formaldehyde condensate and polycarboxylic acid are mixed in a mass percentage of 2:1;

[0096] Retarder: phosphate, citrate;

[0097] Hydrophilic colloid: modified agar;

[0098] Among them, the mass ratio of water reducer, retarder and hydrophilic colloid is 3:1:3.

[0099] The modified agar preparation steps are as follows: firstly, soaking in hydrogen peroxide, then filtering and drying, then soaking in ethanol solution, and finally washing with clean water, filtering and drying to obtain the modified agar.

[0100] The concrete of this comparative example 3 is made of the raw materials in parts by weight shown in the following table:

[0101]

[0102] Among them, the cementitious material is a mixture of gypsum, fly ash and cement;

[0103] Among them, the mass percentage of gypsum, fly ash and cement is: 2:1:15

[0104] Comparative Example 4

[0105] The concrete additive with water-reducing and slow-setting function in this comparative example 4 is composed of the following raw materials:

[0106] Water reducing agent: naphthalenesulfonate formaldehyde condensate and polycarboxylic acid are mixed in a mass percentage of 2:1;

[0107] Retarder: phosphate, citrate;

[0108] Hydrophilic colloid: modified agar;

[0109] Among them, the mass ratio of water reducer, retarder and hydrophilic colloid is 1:2:3.

[0110] The modified agar preparation steps are as follows: firstly, soaking in hydrogen peroxide, then filtering and drying, then soaking in ethanol solution, and finally washing with clean water, filtering and drying to obtain the modified agar.

[0111] The concrete of this comparative example 4 is made of the raw materials in parts by weight shown in the following table:

[0112]

[0113] Among them, the cementitious material is a mixture of gypsum, fly ash and cement;

[0114] Among them, the mass percentage of gypsum, fly ash and cement is: 2:1:15

[0115] Concrete performance testing:

[0116] The prepared concrete was tested for performance according to the testing standard of GB-8076.

[0117] The following table is a statistical data of the difference in setting time, water reduction rate, water bleeding rate ratio, and compressive strength ratio of the concrete prepared in Examples 1-5 and Comparative Examples 1-4.

[0118] Among them, the standard indicators are: setting time difference > +90min, water reduction rate ≧25%, water seepage rate ratio ≦70%, compressive strength ratio (7d≧140%, 28d≧130%).

[0119] Table 1: Statistics of concrete performance test data of Examples 1-5.

[0120]

[0121] Table 2: Statistics of concrete performance test data of comparative examples 1-4.

[0122]

[0123] Based on the above examples 1-5 and comparative examples 1-4, it can be concluded that:

[0124] (1) The additive prepared in this embodiment can effectively prolong the setting time of concrete and improve the water reduction rate of concrete;

[0125] (2) By comparing the data of the embodiment and the comparative example, it can be concluded that the concrete prepared by the additive of the present invention has a significant effect on the water reduction rate, setting time, etc. of the concrete when the ratio of the additive components is reduced or increased. When the mass ratio of the water reducer, retarder and hydrophilic colloid in the additive is 1:1:3, the water reduction rate and retarding time of the concrete reach the best;

[0126] (3) The cementitious material, organic fiber crumbs and additives in the concrete raw materials of the present invention significantly improve the compressive strength of the concrete.

[0127] 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.

[0128] It should be noted that, in this article, the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0129] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. The above is only a preferred implementation of the present invention. It should be pointed out that due to the limitations of textual expression and the objective existence of infinite specific structures, ordinary technicians in this technical field can make several improvements, modifications or changes without departing from the principles of the present invention, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the inventive concept and technical solution to other occasions without improvement, should be regarded as the protection scope of the present invention.

Claims

1. A concrete additive with water-reducing and slow-setting function, characterized in that: The additive is made of a water reducer, a retarder and a hydrophilic colloid in a mass ratio of 1:1:(1-5); The water reducer is a mixed component of naphthalenesulfonate formaldehyde condensate and polycarboxylic acid, and the naphthalenesulfonate formaldehyde condensate and polycarboxylic acid are mixed in a mass percentage of 2:1; Wherein, the hydrophilic colloid is modified agar.

2. The concrete additive with water-reducing and slow-setting function according to claim 1, characterized in that: The retarder is at least one of phosphate and citrate.

3. The concrete additive with water-reducing and slow-setting function according to claim 1, characterized in that: The preparation method of the modified agar comprises the following steps: adding agar into hydrogen peroxide to soak, filtering and drying, then soaking in an ethanol solution, and finally washing with clean water to filter and dry to obtain the modified agar.

4. Concrete prepared by the concrete additive according to any one of claims 1 to 3, characterized in that: The concrete is made of the following raw materials in parts by weight: 400-800 parts of cementitious materials, 2-3 parts of additives, 650-1350 parts of crushed stone, 80-140 parts of water, and 30-55 parts of organic fiber chips.

5. The concrete prepared by the concrete additive according to claim 4, characterized in that: The concrete raw materials are made into parts by weight: 600 parts of cementitious material, 2.5 parts of additives, 950 parts of crushed stone, 105 parts of water, and 40 parts of organic fiber chips.

6. The concrete prepared by the concrete additive according to claim 5, characterized in that: The cementitious material is composed of a mixture of gypsum, fly ash and cement; the mass percentage of the gypsum, fly ash and cement is 2:1:(8-15).

7. The concrete prepared by the concrete additive according to claim 6, characterized in that: The mass percentage of gypsum, fly ash and cement is 2:1:11.

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