A full-solid-waste biomass ash-based light soil and a preparation method thereof

Abstract

The application discloses a kind of full solid waste biomass ash slag-based light soil and preparation method thereof, the light soil raw material is by mass parts, including solid material 100 parts, water 40~80 parts, foaming agent 2~4 parts and water reducing agent 2~4 parts, wherein solid material includes: biomass ash slag 60~90 parts, slag 10~30 parts and desulfurization gypsum 5~10 parts.Method is: biomass ash slag, slag, desulfurization gypsum and part water are mixed to form cementing material slurry, remaining water is added into foaming agent to form foaming liquid, and after foaming, it is mixed with cementing material slurry to prepare the light soil.The application uses biomass ash slag, slag and desulfurization gypsum as the raw material of light soil, greatly reduces the engineering cost while realizing the resource utilization of solid waste, reduces the pollution to environment, and full solid waste biomass ash slag-based light soil has good fluidity, excellent physical properties and other characteristics, and has wide application prospect.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of building materials, and particularly relates to a full-solid-waste biomass ash-based light soil and a preparation method thereof. BACKGROUND

[0002] Light soil is a kind of light filling material in the field of engineering construction, and has the characteristics of light weight, self-supporting, durability, high fluidity, excellent sound insulation, heat insulation and waterproof performance, etc. Light soil is widely used in building overall filling, building foundation pit filling, pipeline backfilling, underground structure load reduction filling, waste roadway and goaf backfilling, underground space wall backfilling such as highway tunnel / railway tunnel / water tunnel, and road and bridge filling engineering, etc.

[0003] The resource utilization of biomass mainly adopts biomass power plants for power generation, and a large amount of biomass ash is generated by combustion. The traditional biomass ash treatment method mainly adopts landfill or direct on-site stacking, which will cause a large amount of land pollution and dust problem, and the ineffective disposal of biomass ash brings new problems and challenges to the entire industry. Therefore, an actual and feasible method capable of consuming a large amount of biomass ash resources is urgently needed.

[0004] In summary, it is urgent to study a full-solid-waste biomass ash-based light soil. SUMMARY

[0005] The technical problem solved by the application is that the application provides a full-solid-waste biomass ash-based light soil and a preparation method thereof, which fully utilizes solid wastes such as biomass ash, slag and desulfurization gypsum, greatly reduces the preparation cost and production difficulty, and obtains light soil with sufficient strength and fluidity.

[0006] The technical scheme is a full-solid-waste biomass ash-based light soil, and the raw materials include, by mass fraction, 100 parts of solid material, 40-80 parts of water, 2-4 parts of foaming agent and 2-4 parts of water reducing agent, wherein the solid material includes 60-90 parts of biomass ash, 10-30 parts of slag and 5-10 parts of desulfurization gypsum.

[0007] Preferably, the biomass ash is treated by drying and grinding, and the fineness is not greater than 100 mesh.

[0008] Preferably, the mass fraction of CaO in the biomass ash is not less than 12%.

[0009] Preferably, the slag is S95 grade granulated blast furnace slag.

[0010] Preferably, the mass fraction of calcium sulfate in the desulfurization gypsum is not less than 83%.

[0011] Preferably, the foaming agent is sodium dodecyl sulfate, sodium fatty alcohol polyoxyethylene ether sulfate or silicone polyether.

[0012] Preferably, the water reducing agent is polycarboxylic acid water reducing agent with a water reducing rate of not less than 30%.

[0013] The preparation method of the full solid waste biomass ash-based lightweight soil described above comprises the following steps:

[0014] S1. uniformly mixing biomass ash, slag and desulfurization gypsum, and then mixing with part of water into which a water reducing agent is added to form a cementitious material slurry;

[0015] S2. adding the remaining water into a foaming agent to form a foaming liquid, and mixing the foaming liquid with the cementitious material slurry after foaming to obtain the full solid waste biomass ash-based lightweight soil.

[0016] Preferably, the mass ratio of the remaining water to the foaming agent is 70-100:1.

[0017] Beneficial effects: The full solid waste biomass ash-based lightweight soil is prepared by using biomass ash as a raw material and adding slag, desulfurization gypsum and other materials, realizing resource utilization and recyclable utilization of biomass ash, slag and desulfurization gypsum, and realizing resource utilization of biomass ash, slag and desulfurization gypsum solid waste on the basis of reducing environmental pollution, and the flowability and strength of the full solid waste biomass ash-based lightweight soil are ensured on the basis of improving the mixing ratio of biomass ash, meeting the design requirements.

[0018] The biomass ash and the slag of the present application contain rich Al2O3, SiO2 and CaO and other compounds, which are chemical components of pozzolanic materials, and the desulfurization gypsum as an activator can improve the activity of the biomass ash and the slag, and hydration reaction generates ettringite and hydrated calcium silicate gel and other hydration products; at the same time, the opposite charges on the surface of the biomass ash and the surface of the slag avoid flocculation of the slurry, and the flowability and strength of the full solid waste biomass ash-based lightweight soil can be improved based on the properties of the biomass ash.

[0019] The present application uses biomass ash as a raw material and adds slag, desulfurization gypsum and other materials to prepare full solid waste biomass ash-based lightweight soil, greatly reduces the material cost under the premise of meeting the requirements, and the preparation method is simple and suitable for large-scale popularization and use. DETAILED DESCRIPTION

[0020] The present application will be further described below in combination with specific embodiments. The raw materials involved are all from commercially available products. Example 1

[0021] A full solid waste biomass ash-based lightweight soil, raw materials of which include, by mass fraction, 100 parts of solid material, 50 parts of water, 2 parts of foaming agent and 2 parts of water reducing agent, wherein the solid material includes: 70 parts of biomass ash, 25 parts of slag and 10 parts of desulfurization gypsum. Among them, the biomass ash is treated by 105 DEG C drying and powder grinding, the fineness is not more than 100 mesh, the mass fraction of CaO is 13%, and the harmful substance content meets the requirements of GB50164-2011; the slag adopts S95 grade granulated blast furnace slag; the mass fraction of calcium sulfate in the desulfurization gypsum is 85%; the foaming agent is sodium dodecyl sulfate; and the water reducing agent adopts polycarboxylic acid water reducing agent with a water reducing rate of 30%.

[0022] The preparation method of the above-mentioned full solid waste biomass ash-based lightweight soil is as follows:

[0023] S1. The biomass ash, slag and desulfurization gypsum are uniformly mixed, and then mixed with part of the water into which the water reducing agent is added to form a cementitious material slurry;

[0024] S2. The remaining water is added to the foaming agent to form a foaming liquid, which is mixed with the cementitious material slurry after foaming to obtain the full solid waste biomass ash-based lightweight soil.

[0025] Among them, the mass ratio of the remaining water to the foaming agent is 80:1. Example 2

[0026] A full solid waste biomass ash-based lightweight soil, raw materials of which include, by mass fraction, 100 parts of solid material, 60 parts of water, 2 parts of foaming agent and 2 parts of water reducing agent, wherein the solid material includes: 80 parts of biomass ash, 15 parts of slag and 5 parts of desulfurization gypsum. Among them, the biomass ash is treated by 105 DEG C drying and powder grinding, the fineness is not more than 100 mesh, the mass fraction of CaO is 13%, and the harmful substance content meets the requirements of GB50164-2011; the slag adopts S95 grade granulated blast furnace slag; the mass fraction of calcium sulfate in the desulfurization gypsum is 85%; the foaming agent is sodium dodecyl sulfate; and the water reducing agent adopts polycarboxylic acid water reducing agent with a water reducing rate of 30%.

[0027] The preparation method of the above-mentioned full solid waste biomass ash-based lightweight soil is as follows:

[0028] S1. The biomass ash, slag and desulfurization gypsum are uniformly mixed, and then mixed with part of the water into which the water reducing agent is added to form a cementitious material slurry;

[0029] S2. The remaining water is added to the foaming agent to form a foaming liquid, which is mixed with the cementitious material slurry after foaming to obtain the full solid waste biomass ash-based lightweight soil.

[0030] Among them, the mass ratio of the remaining water to the foaming agent is 80:1. Example 3

[0031] A full solid waste biomass ash-based light soil, raw materials of which include, by mass fraction, 100 parts of solid material, 70 parts of water, 3 parts of foaming agent and 3 parts of water reducing agent, wherein the solid material includes: 85 parts of biomass ash, 10 parts of slag and 5 parts of desulfurization gypsum. Among them, the biomass ash is treated by drying at 105 DEG C and powder grinding, the fineness is not more than 100 mesh, the mass fraction of CaO is 13%, and the harmful substance content meets the requirements of GB50164-2011; the slag is S95 grade granulated blast furnace slag; the mass fraction of calcium sulfate in the desulfurization gypsum is 85%; the foaming agent is sodium dodecyl sulfate; and the water reducing agent is polycarboxylic acid water reducing agent with a water reducing rate of 30%.

[0032] The preparation method of the above full solid waste biomass ash-based light soil is as follows:

[0033] S1. The biomass ash, slag and desulfurization gypsum are mixed uniformly, and then mixed with part of the water with the water reducing agent to form a cementitious material slurry;

[0034] S2. The remaining water is added to the foaming agent to form a foaming liquid, which is mixed with the cementitious material slurry after foaming to obtain the full solid waste biomass ash-based light soil.

[0035] Among them, the mass ratio of the remaining water to the foaming agent is 80:1. Comparative Example 1

[0036] The difference between this comparative example and Example 1 is that no slag and desulfurization gypsum are mixed. Comparative Example 2

[0037] The difference between this comparative example and Example 2 is that no slag is mixed. Comparative Example 3

[0038] The difference between this comparative example and Example 3 is that no desulfurization gypsum is mixed. Comparative Example 4

[0039] A full solid waste biomass ash-based light soil, raw materials of which include, by mass fraction, 100 parts of solid material, 70 parts of water, 3 parts of foaming agent and 3 parts of water reducing agent, wherein the solid material includes: 85 parts of biomass ash, 10 parts of slag and 5 parts of desulfurization gypsum. Among them, the biomass ash is treated by drying at 105 DEG C and powder grinding, the fineness is not more than 100 mesh, the mass fraction of CaO is 13%, and the harmful substance content meets the requirements of GB50164-2011; the slag is S95 grade granulated blast furnace slag; the mass fraction of calcium sulfate in the desulfurization gypsum is 85%; the foaming agent is sodium dodecyl sulfate; and the water reducing agent is polycarboxylic acid water reducing agent with a water reducing rate of 30%.

[0040] The preparation method of the full-solid-waste biomass ash-based lightweight soil is as follows:

[0041] S1. The biomass ash, slag and desulfurization gypsum are uniformly mixed, and then mixed with part of the water into which a water reducing agent is added to form a cementing material slurry;

[0042] S2. The remaining water is added to the foaming agent to form a foaming liquid, which is mixed with the cementing material slurry after foaming to obtain the full-solid-waste biomass ash-based lightweight soil.

[0043] The mass ratio of the remaining water to the foaming agent is 80:1.

[0044] Flowability test

[0045] The flowability test is carried out according to CJJT177-2012, and the main equipment includes a 400mm*400mm smooth hard plastic plate, a Φ80mm*80 hollow cylinder and a depth vernier caliper, and the maximum horizontal diameter of the slump body measured by the depth vernier caliper is the flowability of the sample.

[0046] Unconfined compressive strength test

[0047] The unconfined compressive strength test is carried out according to CJJT177-2012. The sample size is 100mm*100mm*100mm, and the sample is cured in a curing box with a temperature of 20±2℃ and a humidity of more than 95% to a specified age.

[0048] The test results of the related performance of the full-solid-waste biomass ash-based lightweight soil are shown in Table 1.

[0049] Table 1 Flowability and unconfined compressive strength of the self-curing self-heat-conducting anti-cracking flowable solidified soil

[0050]

[0051] As shown in Table 1, the flowability of the full-solid-waste biomass ash-based lightweight soil of the present application is not much different from that of the comparative example, and is basically at the same level, but the unconfined compressive strength of the full-solid-waste biomass ash-based lightweight soil of the present application is much higher than that of the comparative example. The full-solid-waste biomass ash-based lightweight soil of the present application has a wide source of raw materials, a simple production process, no complex process, improves the solid waste resource recycling rate, has the characteristics of low cost, environmental friendliness and the like under the premise of ensuring the application effect, and has a wide application prospect.

Claims

1. A lightweight soil based on biomass ash residue from solid waste, characterized in that, The raw materials, by weight, include 100 parts solid materials, 40-80 parts water, 2-4 parts foaming agent, and 2-4 parts water-reducing agent. The solid materials include 60-90 parts biomass ash, 10-30 parts slag, and 5-10 parts desulfurized gypsum. The biomass ash is dried and ground to a fineness of no more than 100 mesh. The mass fraction of CaO in the biomass ash is no less than 12%.

2. The lightweight soil based on biomass ash slag from solid waste according to claim 1, characterized in that, The slag used is S95 grade granulated blast furnace slag.

3. The lightweight soil based on biomass ash slag from solid waste according to claim 1, characterized in that, The desulfurized gypsum contains calcium sulfate at a mass fraction of not less than 83%.

4. The lightweight soil based on biomass ash slag from solid waste according to claim 1, characterized in that, The foaming agent is sodium dodecyl sulfate, sodium fatty alcohol polyoxyethylene ether sulfate, or silicone polyether.

5. The lightweight soil based on biomass ash slag from solid waste according to claim 1, characterized in that, The water-reducing agent used is a polycarboxylate water-reducing agent with a water reduction rate of not less than 30%.

6. The method for preparing lightweight soil based on biomass ash from any one of claims 1 to 5, characterized in that, Includes the following steps: S1. Mix biomass ash, slag, and desulfurized gypsum evenly, and then mix with some water containing a water-reducing agent to form a cementitious slurry; S2. Add the remaining water to the foaming agent to form a foaming liquid. After foaming, mix it with the cementitious material slurry to obtain the lightweight soil based on solid waste biomass ash.

7. The method for preparing lightweight soil based on biomass ash from solid waste according to claim 6, characterized in that, The mass ratio of the remaining water to the foaming agent is 70~100:1.

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