阅读说明：本技术 生态混凝土胶凝材料及中性生态混凝土 (Ecological concrete cementing material and neutral ecological concrete ) 是由 费菊泉 于 2020-12-21 设计创作，主要内容包括：本发明涉及生态混凝土技术领域,尤其是指生态混凝土胶凝材料及中性生态混凝土,所述生态混凝土胶凝材料由以下组分制成：石膏20-30份、天然火山灰5-8份、无水硅酸铝粉3-6份、硫酸钾0.5-1.5份、硫酸钠0.3-0.9份、硫酸钙0.6-1.2份、氯化钠1.2-1.8份和聚合硫酸铁0.2-0.5份。所述中性生态混凝土包括上述生态混凝土胶凝材料10-20份、骨料300-400份、水75-90份、低碱值合成烷基苯磺酸钙5-15份、吸水树脂4-12份。本发明研发出一种新型无碱的中性生态混凝土胶凝材料,其中金属离子能形成晶体疏松结构,加入混凝土形成中性混凝土,耐酸性更好,耐久性更强。(The invention relates to the technical field of ecological concrete, in particular to an ecological concrete cementing material and neutral ecological concrete, wherein the ecological concrete cementing material is prepared from the following components in parts by weight: 20-30 parts of gypsum, 5-8 parts of natural volcanic ash, 3-6 parts of anhydrous aluminum silicate powder, 0.5-1.5 parts of potassium sulfate, 0.3-0.9 part of sodium sulfate, 0.6-1.2 parts of calcium sulfate, 1.2-1.8 parts of sodium chloride and 0.2-0.5 part of polymeric ferric sulfate. The neutral ecological concrete comprises 10-20 parts of the ecological concrete cementing material, 400 parts of aggregate 300-90 parts of water, 5-15 parts of low-base-number synthetic calcium alkyl benzene sulfonate and 4-12 parts of water-absorbing resin. The invention develops a novel alkali-free neutral ecological concrete cementing material, wherein metal ions can form a crystal loose structure, and the neutral concrete is formed by adding concrete, so that the acid resistance is better, and the durability is stronger.)

1. The ecological concrete cementing material is characterized in that: the composition is prepared from the following components: 20-30 parts of gypsum, 5-8 parts of natural volcanic ash, 3-6 parts of anhydrous aluminum silicate powder, 0.5-1.5 parts of potassium sulfate, 0.3-0.9 part of sodium sulfate, 0.6-1.2 parts of calcium sulfate, 1.2-1.8 parts of sodium chloride and 0.2-0.5 part of polymeric ferric sulfate.

2. The eco-concrete cementitious material according to claim 1, characterised in that: more preferably, it is made of the following components: 23-28 parts of gypsum, 6-7 parts of natural volcanic ash, 4.5-5.5 parts of anhydrous aluminum silicate powder, 0.9-1.3 parts of potassium sulfate, 0.5-0.7 part of sodium sulfate, 0.8-1.0 part of calcium sulfate, 1.4-1.6 parts of sodium chloride and 0.3-0.4 part of polymeric ferric sulfate.

3. The eco-concrete cementitious material according to claim 1, characterised in that: the pH value of the natural volcanic ash is 7-7.6.

4. The eco-concrete cementitious material according to claim 1, characterised in that: the particle size of the natural volcanic ash is 0.8-1.8 μm.

5. Use of the eco-concrete gel-forming material of claims 1-4 to make neutral eco-concrete, characterized in that: comprises 10-20 parts of the ecological concrete cementing material, 400 parts of aggregate 300-sand, 75-90 parts of water, 5-15 parts of low-base-number synthetic calcium alkyl benzene sulfonate and 4-12 parts of water-absorbing resin.

6. The ecological concrete cementitious material and neutral ecological concrete according to claim 5, wherein: comprises 14-17 parts of the ecological concrete cementing material, 370 parts of aggregate 320-370 parts of water, 8-12 parts of low-base-number synthetic calcium alkyl benzene sulfonate and 6-10 parts of water-absorbing resin.

7. The ecological concrete cementitious material and neutral ecological concrete according to claim 5, wherein: the water-absorbing resin is a starch-acrylate polymerization cross-linked product and an acrylamide-acrylate copolymerization cross-linked product.

Technical Field

The invention relates to the technical field of ecological concrete, in particular to an ecological concrete cementing material and neutral ecological concrete.

Background

The ecological concrete is also called porous concrete, and refers to a special concrete material, has special structure and surface characteristics, can reduce environmental load, adapts to biological growth, and has positive effects on adjusting ecological balance, beautifying environmental landscape and realizing the coordination of human beings and self-cognition.

At present, cement is used as a cementing material for preparing ecological concrete, and strong alkaline hydration products such as calcium hydroxide and the like are generated in the cement hydration process (even if little cement is hydrated to generate calcium hydroxide), so that a strong alkaline environment is caused, the environment where plants grow is adversely affected, early germination and long-term growth in the later period of the plants are not facilitated, and the situations that the plants do not germinate or the growth rate of the plants in the next year is low occur.

Disclosure of Invention

The invention aims to provide an ecological concrete cementing material and neutral ecological concrete, and develops a novel alkali-free neutral ecological concrete cementing material, wherein metal ions can form a crystal loose structure, and the neutral concrete is formed by adding concrete, so that the acid resistance is better, and the durability is stronger.

In order to solve the technical problems, the invention adopts the following technical scheme:

the ecological concrete cementing material is prepared from the following components: 20-30 parts of gypsum, 5-8 parts of natural volcanic ash, 3-6 parts of anhydrous aluminum silicate powder, 0.5-1.5 parts of potassium sulfate, 0.3-0.9 part of sodium sulfate, 0.6-1.2 parts of calcium sulfate, 1.2-1.8 parts of sodium chloride and 0.2-0.5 part of polymeric ferric sulfate.

Preferably, it is made of the following components: 23-28 parts of gypsum, 6-7 parts of natural volcanic ash, 4.5-5.5 parts of anhydrous aluminum silicate powder, 0.9-1.3 parts of potassium sulfate, 0.5-0.7 part of sodium sulfate, 0.8-1.0 part of calcium sulfate, 1.4-1.6 parts of sodium chloride and 0.3-0.4 part of polymeric ferric sulfate.

Preferably, the pH of the natural pozzolan is 7-7.6.

Preferably, the particle size of the natural volcanic ash is 0.8 μm to 1.8 μm.

The neutral ecological concrete prepared by the ecological concrete cementing material comprises 10-20 parts of the ecological concrete cementing material, 400 parts of aggregate 300-.

Preferably, the ecological concrete comprises 14-17 parts of the ecological concrete cementing material, 320-370 parts of aggregate, 80-85 parts of water, 8-12 parts of low-base-number synthetic calcium alkyl benzene sulfonate and 6-10 parts of water-absorbing resin.

Preferably, the water-absorbent resin is a starch-acrylate polymer cross-linked product and an acrylamide-acrylate copolymer cross-linked product.

The invention has the beneficial effects that:

the metal ions in the gel can form a crystal loose structure, and the gel is added into concrete to form neutral concrete, so that the acid resistance is better, and the durability is stronger.

Detailed Description

The present invention will be further described with reference to the following examples for facilitating understanding of those skilled in the art, and the description of the embodiments is not intended to limit the present invention.

Example 1

Verifying acidity and alkalinity of ecological concrete cementing material

In order to verify the pH value of the novel eco-concrete cementing material, the pH value of the eco-concrete cementing material at different ages is determined according to the American standard ASTM D4972 (Standard test method for soil pH value), and the specific tests are as follows:

1. preparing an ecological concrete cementing material:

a first group: uniformly mixing 20 parts of gypsum, 5 parts of natural volcanic ash, 3 parts of anhydrous aluminum silicate powder, 0.5 part of potassium sulfate, 0.3 part of sodium sulfate, 0.6 part of calcium sulfate, 1.2 parts of sodium chloride and 0.2 part of polymeric ferric sulfate to obtain the ecological concrete cementing material;

second group: uniformly mixing 25 parts of gypsum, 6.5 parts of natural volcanic ash, 4.5 parts of anhydrous aluminum silicate powder, 1 part of potassium sulfate, 0.6 part of sodium sulfate, 0.9 part of calcium sulfate, 1.5 parts of sodium chloride and 0.35 part of polymeric ferric sulfate to obtain an ecological concrete cementing material;

third group: uniformly mixing 30 parts of gypsum, 8 parts of natural volcanic ash, 6 parts of anhydrous aluminum silicate powder, 1.5 parts of potassium sulfate, 0.9 part of sodium sulfate, 1.2 parts of calcium sulfate, 1.8 parts of sodium chloride and 0.5 part of polymeric ferric sulfate to obtain the ecological concrete cementing material;

2. and (3) detecting the acidity and alkalinity of the ecological concrete cementing material:

uniformly mixing water and the ecological concrete cementing material according to the weight ratio of 0.28, grinding the solidified ecological concrete cementing material into powder with the particle size of less than 2mm, suspending the solid powder in distilled water (the mass ratio of the solid to the distilled water is 0.1), and measuring the pH conditions of the ecological concrete cementing material in different ages (1, 3, 7, 14 and 28 days) according to a pH measuring instrument, wherein the test results are shown in the following table 1:

TABLE 1 acidity and alkalinity of eco-concrete cement

As can be seen from the data in Table 1, the pH of the eco-concrete cementitious material of the embodiment is 6.9-7.2, and is neutral.

Example 2

Ecological concrete cementing material and performance detection of ecological concrete

(1) And preparing neutral ecological concrete:

selecting the ecological concrete cementing material prepared in the embodiment 1, and then mixing the materials according to the following proportion:

group 1: mixing 10 parts of ecological concrete cementing material, 300 parts of aggregate, 5 parts of low-base-number synthetic calcium alkyl benzene sulfonate and 4 parts of water-absorbing resin, and taking the aggregate with the particle size of 20-40 mm and placing for later use; adding 75 parts of water, uniformly mixing, and fully stirring to obtain ecological concrete;

and 2, group: mixing 15 parts of ecological concrete cementing material, 350 parts of aggregate, 10 parts of low-base-number synthetic calcium alkyl benzene sulfonate and 8 parts of water-absorbing resin, and taking the aggregate with the particle size of 20-40 mm and placing for later use; adding 82 parts of water, uniformly mixing, and fully stirring to obtain ecological concrete;

and 3, group: mixing 20 parts of ecological concrete cementing material, 400 parts of aggregate, 15 parts of low-base-number synthetic calcium alkyl benzene sulfonate and 12 parts of water-absorbing resin, and taking the aggregate with the particle size of 20-40 mm and placing for later use; adding 90 parts of water, uniformly mixing, and fully stirring to obtain the ecological concrete;

(2) and testing the neutral ecological concrete:

filling the ecological concrete into a mold (the size is 150mm multiplied by 150mm), vibrating for 5s, and naturally curing.

TABLE 2

Example 4: comparative test for plant growth

(1) Test groups: taking 2 groups of neutral concrete in example 3;

and (4) performing off-site test pouring, preparing slurry containing grass seeds, nutrient soil and the like after pouring, pouring into the ecological concrete, maintaining, and observing the growth condition of plants.

(2) Comparison group: taking 40 parts of No. 42.5 ordinary portland cement, 50 parts of fly ash, 10 parts of kaolin, 0.3 part of a water reducing agent and 0.3 part of an additive (calcium chloride) for later use after proportioning; the subsequent steps are the same as those of the test group.

After one month, by comparing the test group with the comparison group, the plant growth rate of the concrete (test group) adopting the novel neutral ecological concrete cementing material reaches 99.3 percent, while the plant coverage rate of the concrete adopting the comparison group is only 20 percent, and a large amount of yellow leaves appear.

As can be seen from the examples 1 to 4, the ecological concrete cementing material is neutral, the pH value is 6.9 to 7.2, and the 28d compressive strength is not less than 52.3 MPa; the pH value of the ecological concrete prepared by adopting the cementing material is 7.0-7.4, the compressive strength of 28d porous concrete is not less than 15.0MPa, and the porosity is 21-30%; the freeze-thaw resisting times are not less than 50; the ecological concrete of the invention does not need technical measures such as acid-base neutralization, sealing and the like, so that the plants can grow for a long time, and the plant coverage rate is as high as 99.3 percent; the ecological concrete of the invention is used for ecological concrete slope protection/bank protection of rivers, water transport channels, railways, expressways, scenic spot gardens and the like, can improve the stability of the slope protection/bank protection, simultaneously plays a role in beautifying the environmental landscape, and can realize long-term continuous ecological slope protection/bank protection

Finally, it should be noted that the above-mentioned description is only a preferred embodiment of the present invention, and those skilled in the art can make various similar representations without departing from the spirit and scope of the present invention.