阅读说明：本技术 一种用于生态护坡混凝土的降碱剂 (Alkali reducing agent for ecological slope protection concrete ) 是由 王辉 薛子烨 于 2020-04-29 设计创作，主要内容包括：本发明公开了一种用于生态护坡混凝土的降碱剂,由以下重量份原料组成：超细二氧化硅5～20份、硅灰10～50份、粉煤灰20～70份、减水剂2～10份、磷酸二氢钾1～8份、磷酸二氢铵1～8份、碳酸氢铵1～8份、硫酸亚铁1～8份。本发明降碱剂适用于植生型生态护坡混凝土护坡,不仅能够有效的降低透水混凝土碱性,使透水混凝土的PH值从12～13降到低到8～9,满足了植物生长的PH值条件,而且降碱剂在降碱的同时还为植物生长提供有效的营养元素,使植物更好的生长,为植物生长提供了优良的生存环境,有利于植生型生态护坡混凝土护坡的自然观感；还解决了现有降碱剂在植生混凝土中降碱效果差、不利于植物生长的技术问题。(The invention discloses an alkali reducing agent for ecological slope protection concrete, which is prepared from the following raw materials in parts by weight: 5-20 parts of superfine silicon dioxide, 10-50 parts of silica fume, 20-70 parts of fly ash, 2-10 parts of a water reducing agent, 1-8 parts of monopotassium phosphate, 1-8 parts of ammonium dihydrogen phosphate, 1-8 parts of ammonium bicarbonate and 1-8 parts of ferrous sulfate. The alkali-reducing agent is suitable for concrete slope protection of plant-growing ecological slope protection, can effectively reduce the alkalinity of pervious concrete, enables the pH value of the pervious concrete to be reduced from 12-13 to 8-9, meets the pH value condition of plant growth, provides effective nutrient elements for plant growth while reducing alkali, enables plants to grow better, provides excellent living environment for plant growth, and is beneficial to the natural impression of the concrete slope protection of plant-growing ecological slope protection; also solves the technical problems that the prior alkali-reducing agent has poor alkali-reducing effect in the plant-growing concrete and is not beneficial to the growth of plants.)

1. The alkali reducing agent for the ecological slope protection concrete is characterized by comprising the following raw materials in parts by weight: 5-20 parts of superfine silicon dioxide, 10-50 parts of silica fume, 20-70 parts of fly ash, 2-10 parts of a water reducing agent, 1-8 parts of monopotassium phosphate, 1-8 parts of ammonium dihydrogen phosphate, 1-8 parts of ammonium bicarbonate and 1-8 parts of ferrous sulfate.

2. The alkali-reducing agent for ecological slope protection concrete according to claim 1, which is composed of the following raw materials in parts by weight: 10-15 parts of superfine silicon dioxide, 20-30 parts of silica fume, 40-50 parts of fly ash, 4-8 parts of a water reducing agent, 3-6 parts of monopotassium phosphate, 3-6 parts of ammonium dihydrogen phosphate, 3-6 parts of ammonium bicarbonate and 3-6 parts of ferrous sulfate.

3. The alkali-reducing agent for ecological slope protection concrete according to claim 1, which is composed of the following raw materials in parts by weight: 12-13 parts of superfine silicon dioxide, 23-26 parts of silica fume, 45-47 parts of fly ash, 5-6 parts of a water reducing agent, 4-5 parts of monopotassium phosphate, 4-5 parts of ammonium dihydrogen phosphate, 4-5 parts of ammonium bicarbonate and 4-5 parts of ferrous sulfate.

4. The alkali-reducing agent for ecological slope protection concrete according to any one of claims 1 to 3, wherein the ultra-fine silica is 1500 mesh.

5. The alkali-reducing agent for ecological slope protection concrete according to any one of claims 1 to 3, wherein the silica content in the silica fume is greater than 98%; the silica fume is 800 meshes.

6. The alkali-reducing agent for ecological slope protection concrete according to any one of claims 1 to 3, wherein the water-reducing agent is one or a mixture of two of lignosulfonate, naphthalene sulfonate and polycarboxylic acid water-reducing agent.

7. The method for preparing the alkali-reducing agent for ecological slope protection concrete according to any one of claims 1 to 3, comprising the steps of:

(1) uniformly mixing the superfine silicon dioxide, the silica fume and the fly ash according to the weight part ratio;

(2) uniformly mixing a water reducing agent, monopotassium phosphate, ammonium dihydrogen phosphate, ammonium bicarbonate and ferrous sulfate according to the weight part ratio;

(3) and (3) uniformly mixing the two uniformly mixed materials according to the weight part ratio to obtain the alkali-reducing agent.

8. The application of the alkalinity reducing agent prepared by the preparation method of claim 7 in ecological slope protection concrete.

9. The use of claim 8, wherein the method for using the alkali-reducing agent in the ecological slope protection concrete is as follows: the prepared alkali-reducing agent is directly mixed into concrete and evenly stirred.

10. The use of claim 9, wherein the amount of the alkali-reducing agent added to the concrete is 3% to 12% of the amount of cement in the concrete.

Technical Field

The invention relates to the field of slope protection engineering of two banks of a river channel, in particular to an alkali reducing agent for ecological slope protection concrete.

Background

At present, the common revetment forms in the market are plant type revetment and cement concrete revetment, but the plant type revetment has limited water flow and wind wave scouring resistance, and is easy to be scoured by rainwater to form gullies at the initial molding stage, so that the revetment effect is seriously influenced; the cement concrete revetment has high cost and poor natural appearance. Therefore, the plant growing type ecological slope protection concrete slope protection which has the concrete anti-scouring capability and the ecological and natural beauty of plants is more and more popular and more important.

Ecological bank protection concrete can realize ecological planting again when realizing safety protection, is a novel slope protection material that can be fine the combination of engineering protection and ecological remediation. The basic unit of the vegetation type ecological slope protection concrete is pervious concrete, and the effect is that the plant on top layer provides the possibility of growing, and the root hair of top layer plant can pass pervious concrete's porous structure, pricks root bottom soil, satisfies the condition that lasts the growth. However, after the ordinary pervious concrete is cured, moisture can permeate into soil through pores in the pervious concrete, and the concrete has high alkalinity, so that the bottom soil also has high alkalinity after moisture permeation, the soil with high alkalinity cannot meet the plant growth requirement, and the plant growth is seriously influenced, so that the concrete needs to be subjected to alkali reduction treatment, the soil environment required by the plant growth can be met after the treatment, and the plant growth is facilitated.

Disclosure of Invention

The invention aims to overcome the defects and provides an alkali reducing agent for ecological slope protection concrete. The alkali-reducing agent is suitable for concrete slope protection of plant-growing ecological slope protection, can effectively reduce the alkalinity of pervious concrete, enables the pH value of the pervious concrete to be reduced from 12-13 to 8-9, meets the pH value condition of plant growth, provides effective nutrient elements for plant growth while reducing alkali, enables plants to grow better, provides excellent living environment for plant growth, and is beneficial to the natural impression of the concrete slope protection of plant-growing ecological slope protection; in addition, compared with the alkali-reducing agent in the prior art, the alkali-reducing agent disclosed by the invention solves the technical problems that the alkali-reducing effect of the existing alkali-reducing agent in plant concrete is poor and plant growth is not facilitated, and the pH of the alkali-reducing agent can be reduced to 8-9 within 20 days of plant concrete maintenance, so that the plant growth is facilitated.

The technical scheme of the invention is as follows:

the invention provides an alkali reducing agent for ecological slope protection concrete, which is prepared from the following raw materials in parts by weight: 5-20 parts of superfine silicon dioxide, 10-50 parts of silica fume, 20-70 parts of fly ash, 2-10 parts of a water reducing agent, 1-8 parts of monopotassium phosphate, 1-8 parts of ammonium dihydrogen phosphate, 1-8 parts of ammonium bicarbonate and 1-8 parts of ferrous sulfate.

Preferably, the alkali reducing agent for the ecological slope protection concrete is prepared from the following raw materials in parts by weight: 10-15 parts of superfine silicon dioxide, 20-30 parts of silica fume, 40-50 parts of fly ash, 4-8 parts of a water reducing agent, 3-6 parts of monopotassium phosphate, 3-6 parts of ammonium dihydrogen phosphate, 3-6 parts of ammonium bicarbonate and 3-6 parts of ferrous sulfate.

Most preferably, the alkali reducing agent for the ecological slope protection concrete comprises the following raw materials in parts by weight: 12-13 parts of superfine silicon dioxide, 23-26 parts of silica fume, 45-47 parts of fly ash, 5-6 parts of a water reducing agent, 4-5 parts of monopotassium phosphate, 4-5 parts of ammonium dihydrogen phosphate, 4-5 parts of ammonium bicarbonate and 4-5 parts of ferrous sulfate.

The superfine silicon dioxide is 1500 meshes. The time required by reducing the alkali is shortened, and the efficiency of reducing the alkali is improved.

The content of silicon dioxide in the silica fume is more than 98 percent; the silica fume is 800 meshes. Is favorable for ensuring the continuous alkali-reducing effect of the plant-growing concrete in the later period.

The water reducing agent is one or a mixture of two of lignosulfonate, naphthalene sulfonate or polycarboxylic acid water reducing agent.

The preparation method of the alkali reducing agent for the ecological slope protection concrete comprises the following steps:

(1) uniformly mixing the superfine silicon dioxide, the silica fume and the fly ash according to the weight part ratio;

(2) uniformly mixing a water reducing agent, monopotassium phosphate, ammonium dihydrogen phosphate, ammonium bicarbonate and ferrous sulfate according to the weight part ratio;

(3) and (3) uniformly mixing the two uniformly mixed materials according to the weight part ratio to obtain the alkali-reducing agent.

The alkali-reducing agent prepared by the preparation method is applied to ecological slope protection concrete.

The method for applying the alkali reducing agent to the ecological slope protection concrete comprises the following steps: the prepared alkali-reducing agent is directly mixed into concrete and evenly stirred. The use is simpler.

The dosage of the alkali-reducing agent in the concrete is 3-12% of the dosage of cement in the concrete.

The fly ash is I-grade or II-grade fly ash which meets the specification in GB/T1596-2017. Potassium dihydrogen phosphate, ammonium bicarbonate and ferrous sulfate are all analytical reagents.

The alkali reducing principle of the alkali reducing agent is as follows: the cement in the concrete can generate a large amount of Ca (OH) after hydration reaction₂The permeable concrete is made to be strongly alkaline, and the addition of the alkali reducing agent can effectively consume Ca (OH)₂Thereby achieving the purpose of reducing alkali.

The invention has the beneficial effects that:

(1) the alkali-reducing agent is suitable for concrete slope protection of plant-growing ecological slope protection, can effectively reduce the alkalinity of pervious concrete, enables the pH value of the pervious concrete to be reduced from 12-13 to 8-9, meets the pH value condition of plant growth, provides effective nutrient elements for plant growth while reducing alkali, enables plants to grow better, provides excellent living environment for plant growth, and is beneficial to the natural impression of the concrete slope protection of plant-growing ecological slope protection; compared with the alkali-reducing agent in the prior art, the alkali-reducing agent disclosed by the invention solves the technical problems that the alkali-reducing effect of the existing alkali-reducing agent in plant concrete is poor and plant growth is not facilitated, and the pH of the alkali-reducing agent can be reduced to 8-9 within 20 days of plant concrete maintenance, so that the plant growth is facilitated.

(2) The eight components in the alkali-reducing agent have specific proportions, and are mutually coordinated, so that the aim of reducing alkali better is fulfilled. The water reducing agent in the alkali reducing agent can effectively disperse ultrafine silicon dioxide, silica fume, fly ash and the like in the plant concrete cement paste on one hand, and can also improve the workability of plant concrete on the other hand; the four components of potassium dihydrogen phosphate, ammonium bicarbonate and ferrous sulfate not only achieve the purpose of reducing alkali, but also provide effective nutrient elements for plant growth, enable plants to grow better and provide excellent living environment for plant growth.

Detailed Description

In the following examples, the ultra-fine silica was obtained from Hengtai New materials, Inc. of Shouguang, the silica fume was obtained from Hebei Jiehu mineral products, Inc., the fly ash was obtained from Hebei Jinghang mineral products, Inc., the water reducing agent was obtained from Shanghai Yunji New materials, science and technology, Inc. and Shanghai Simpleo industries, all of which were commercially available potassium dihydrogen phosphate, ammonium hydrogen carbonate and ferrous sulfate.