Tuff-based green ecological concrete and preparation method thereof

Abstract

The invention discloses tuff-based green ecological concrete and a preparation method thereof. The tuff-based green ecological concrete is prepared from the following components in parts by weight: 100 to 140 parts of tuff powder, 30 to 50 parts of tuff particles, 80 to 120 parts of fly ash, 60 to 80 parts of kaolin, 30 to 50 parts of a composite additive, 280 to 350 parts of desert sand, 80 to 120 parts of high-performance hollow glass beads, 100 to 150 parts of ceramsite and 160 to 200 parts of water, wherein the composite additive is prepared by taking monopotassium phosphate, sodium dihydrogen phosphate, carbamide and graphene oxide dispersion liquid as main raw materials and conducting fermentation and compounding. The obtained ecological concrete has good water retention, fertilizer fixation, air permeability and durability, can be used for desert edge windbreak forests, gobi planting plants, wind prevention and sand fixation, can realize resource utilization of tuff, desert sand and the like, and produces important economic and environmental benefits.

Description

technical field [0001] The invention belongs to the technical field of ecological concrete, and in particular relates to a tuff-based green ecological concrete and a preparation method thereof. Background technique [0002] Tuff is a kind of pyroclastic rock, and more than 50% of its pyroclastic material has a particle diameter less than 2mm, and its main component is volcanic ash. The main mineral components of tuff obtained from volcanic eruption include: 1) aluminosilicate glass body (in addition to the main components of Al, Si and O, it also contains a small amount of elements such as Ca, Fe, Na, K, Ti, Mg and Mn), 2) Crystal minerals, usually including quartz, apatite, mullite, biotite, magnetite, epidote, the total amount is about 20-40%; 3) Unburned carbon Particles, generally not more than 5% in tuff. However, tuff has problems such as low activity, and usually requires ball milling. However, the shape of tuff particles after ball milling is irregular, which affec...

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Problems solved by technology

[0003] Ecological concrete often needs to have large pores, which are filled with soil to facilitate plant growth; however, the water holding capacity of the soil is limited, and water needs to be replenished frequently. Usually, it is necessary to lay a water supply network inside the concrete and establish an irrigation system. However, frequent irrigation can easily lead to soil nutrient loss. , and the project cost is expensive, and the later maintenance cost is higher

Ecological concrete is a kind of concrete with continuous and semi-continuous pores. Its pore structure allows water and air to pass through, creating a good growth environment for plants. However, the existence of large pores will inevitably lead to the loss of water and soluble salts. Decreased soil moisture and fertility

However, at present, ordinary ecological concrete still has the following disadvantages: 1) poor durability, there are a large number of honeycomb interconnected pores in the vegetation concrete, and its porosity is above 25%, and the durability is poor; 2) the compressive strength is low, and it is difficult to effectively take into account The characteristics of compressive strength and high porosity need to further solve the contradiction between compressive strength and porosity; 3) High alkalinity, the ecological concrete prepared by ordinary Portland cement is bound to have very high alkalinity (pH value in 12 or more), unable to meet the requirements of plant growth, how to reduce the alkalinity on the basis of not reducing the compressive strength is a major technical problem

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