CN113773036A - Phosphogypsum highway base material and preparation method thereof - Google Patents
Phosphogypsum highway base material and preparation method thereof Download PDFInfo
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- CN113773036A CN113773036A CN202111168492.1A CN202111168492A CN113773036A CN 113773036 A CN113773036 A CN 113773036A CN 202111168492 A CN202111168492 A CN 202111168492A CN 113773036 A CN113773036 A CN 113773036A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/14—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
- C04B28/142—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing synthetic or waste calcium sulfate cements
- C04B28/143—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing synthetic or waste calcium sulfate cements the synthetic calcium sulfate being phosphogypsum
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
- C04B22/06—Oxides, Hydroxides
- C04B22/062—Oxides, Hydroxides of the alkali or alkaline-earth metals
- C04B22/064—Oxides, Hydroxides of the alkali or alkaline-earth metals of the alkaline-earth metals
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- Inorganic Chemistry (AREA)
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- Chemical Kinetics & Catalysis (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a phosphogypsum highway base material and a preparation method thereof, wherein the base material is prepared from the following raw materials: phosphogypsum, quicklime, fly ash, granular soil, curing agent, broken stone, phosphorous slag and portland cement; the preparation method comprises the following steps: preparing raw materials for later use; stirring the quick lime and part of the phosphogypsum at a low speed, grinding and sieving the quick lime and part of the phosphogypsum for later use, and simultaneously grinding and sieving the rest phosphogypsum for later use; stirring the screened phosphogypsum and the curing agent at a low speed, then adding the screened mixture of the quicklime and the phosphogypsum and fly ash, stirring at a low speed, and then adding the granular soil, the broken stone, the phosphorous slag and the portland cement, and stirring uniformly; then adding water into the total uniformly stirred materials and stirring; the preparation steps are simplified, and meanwhile, the early strength and other properties of the base material are effectively improved.
Description
Technical Field
The invention relates to the field of highway construction materials, in particular to a phosphogypsum highway base material and a preparation method thereof.
Background
Phosphogypsum is a byproduct produced by extracting phosphorite with sulfuric acid to prepare phosphoric acid, mainly contains calcium sulfate dihydrate, and belongs to industrial waste. With the rapid development of phosphate fertilizer industry in China, the production amount of phosphogypsum is rapidly increased year by year. In 2009, the phosphogypsum yield in China is up to about 5000 ten thousand tons, and the phosphogypsum is mainly concentrated in southwest areas, and other areas are relatively few. By the end of 2011, the cumulative stockpiling of phosphogypsum was about 3 hundred million tons. The large amount of stockpiling of the phosphogypsum not only can invade precious land resources, but also can pollute the atmosphere, underground water and soil through wind erosion and rain erosion. In addition, if the human body contacts the phosphogypsum for a long time, the pathological changes or death can be caused.
The existing resource utilization modes mainly comprise the application of the method in the cement industry, the production of chemical raw materials and gypsum building material products, the application of the method as roadbed or industrial filler, the improvement of soil and the like. However, because phosphorus pentoxide and fluorine contained in phosphogypsum have great influence on resource utilization, the comprehensive utilization rate of phosphogypsum in China in 2010 is only about 20%.
From the viewpoint of using phosphogypsum as a roadbed filler, pure phosphogypsum is not suitable for being used as the roadbed filler because the pure phosphogypsum has stronger hydrophilicity and poor water stability. The water content of the phosphogypsum generally reaches 20-25%, and the phosphogypsum is high in water content and high in viscosity, so that the phosphogypsum is very easily adhered to various equipment in the loading, lifting and conveying processes, so that material accumulation and blockage are caused, and the normal operation of the production process is influenced; the highway base layer made of the roadbed material has low compressive resistance, especially low early strength and is easy to crack in the later period.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a phosphogypsum highway base course material and a preparation method thereof, so that the utilization amount of the phosphogypsum is at least increased, the strength of the highway base course is improved, the stability of the highway base course is improved, and the cracking of the highway base course is effectively prevented.
The purpose of the invention is realized by the following technical scheme: the phosphogypsum highway base material is prepared from the following raw materials in parts by weight: 68-76 parts of phosphogypsum, 11-13 parts of quick lime, 13-21 parts of fly ash, 7-10 parts of granular soil, 3-5 parts of curing agent, 30-40 parts of broken stone, 20-40 parts of phosphorous slag and 4-7 parts of silicate cement.
Further, the health-care food is prepared from the following raw materials in parts by weight: 74 parts of phosphogypsum, 12.2 parts of quick lime, 18 parts of fly ash, 9 parts of aggregate soil, 4 parts of curing agent, 27 parts of broken stone, 22 parts of phosphorous slag and 4.6 parts of silicate cement.
Furthermore, the content of crystal water of the phosphogypsum is 15-18%, and the content of attached water of the phosphogypsum is 3-6%; the total content of the crystal water and the attached water of the phosphogypsum is 20 percent; prevent caking in the preparation process, influence the performance of the formed base material and reduce the construction difficulty.
Furthermore, the content of effective calcium oxide in the quick lime is not less than 95%, and the quick lime and the fly ash are subjected to volcanic ash reaction after a series of modifications, so that the early strength of a highway base layer formed by roadbed materials is increased.
Further, the curing agent consists of a solid curing agent and a liquid curing agent, wherein the solid curing agent is 3.8 parts of ZY2 type solid curing agent, and the liquid curing agent is 0.2 part of ZY3 type liquid curing agent.
Furthermore, the content of the granular soil with the particle size of less than 0.425mm in the granular soil is controlled within 5 percent, so that the influence of the granular soil on the drying shrinkage strain of the phosphogypsum highway base material is prevented, and the cracking of the subgrade formed by the base material in the early stage is effectively prevented.
Furthermore, the natural water content of the fly ash is lower than 35%, the total content of silicon dioxide, aluminum oxide and ferric oxide in the fly ash is not lower than 73%, the 0.3mm passing rate is not smaller than 92%, and the 0.075mm passing rate is not smaller than 76%, the water content in the base material is controlled, the strength of the roadbed formed by the base material can be improved, and the fly ash and the quick lime can react with the quick lime under relevant conditions under the promoting effect of the phosphogypsum (the phosphogypsum can excite the potential activity of the fly ash to enable the volcanic ash reaction to be carried out more quickly and fully), so that the early strength of the roadbed formed by the base material is further improved; meanwhile, the phosphogypsum is in the shapes of needle, plate and the like, most of the fly ash is spherical, and the granules in the phosphogypsum fly ash consolidation material have larger internal friction force and are beneficial to forming the strength of the phosphogypsum fly ash consolidation material; the portland cement has high early strength and is less in dry shrinkage.
The preparation method of the phosphogypsum highway base material comprises the following steps:
s1, preparing 68-76 parts of phosphogypsum, 11-13 parts of quick lime, 13-21 parts of fly ash, 7-10 parts of aggregate soil, 3-5 parts of curing agent, 20-40 parts of broken stone, 20-40 parts of phosphorous slag and 4-7 parts of silicate cement for later use;
s2, stirring 11-13 parts of the quick lime and 4-5 parts of the phosphogypsum at a low speed for 16h, grinding the uniformly stirred quick lime and the fly ash, sieving the ground quick lime and the fly ash by a 0.07mm sieve for later use, and meanwhile, crushing the residual phosphogypsum by a 0.075mm sieve for later use;
s3, stirring the phosphogypsum sieved by a 0.075mm sieve and the curing agent at a low speed for 2-3h, then adding a mixture of the quick lime and the phosphogypsum sieved by a 0.07mm sieve and fly ash, stirring at a low speed for 4-6h, and then adding the granular soil, the broken stone, the phosphorous slag and the portland cement, and stirring uniformly;
and S4, adding water accounting for 13-17% of the total weight of the materials into the uniformly stirred materials, and then stirring at a medium speed for 2-3 min.
Further, the stirring speed of the low-speed stirring is 40r/min, and the stirring speed of the medium-speed stirring is 70 r/min.
The phosphogypsum and the quick lime are stirred and powdered firstly, the quick lime is modified by the phosphogypsum, the stability of a base material is improved, particularly the later strength of a highway base formed by the base material can be improved, meanwhile, part of crushed stone can be replaced by phosphorous slag, the using amount of the material is reduced, and the strength can be further improved while the material cost is reduced by adjusting the proportion of the phosphorous slag and the crushed stone; the phosphogypsum is modified by the curing agent, so that the water stability of the phosphogypsum is improved, the CBR value and the unconfined strength of the phosphogypsum are improved, and the aim of improving the stability and the strength of a highway base layer made of a base material is fulfilled; the particle size of each material is strictly controlled, the probability of cracks generated on the highway base course is reduced, and the durability of the highway base course is improved.
The invention has the beneficial effects that: the phosphogypsum is used for modifying the quicklime, so that the quicklime digestion link, the base material production link and the dust raising are reduced, and the environment-friendly effect is achieved; the phosphogypsum is modified by the curing agent, so that the water stability of the phosphogypsum is improved, the CBR value and the unconfined strength of the phosphogypsum are improved, and the lightness and the stability of a base material are further improved; by selecting and proportioning the base material, the strength, stability and durability of the road base layer made of the base material are further improved, and the dry shrinkage and temperature are reduced; the early strength can be improved without using alkaline composite early strength agent.
Detailed Description
The technical solutions of the present invention are described in further detail below, but the scope of the present invention is not limited to the following.
Example 1
The preparation method of the phosphogypsum highway base material comprises the following steps:
s1, preparing phosphogypsum 68 (the content of crystal water of the phosphogypsum is 15%, the content of attached water is 3%), 11 parts of quick lime (the effective content of calcium oxide is 95%), 13 parts of fly ash (the natural water content of the fly ash is 35%, the total content of silicon dioxide, aluminum oxide and iron oxide in the fly ash is 73%, the 0.3mm passing rate is 92%, the 0.075mm passing rate is 76%), 7 parts of granular soil (the content of the granular soil with the particle size of 0.425mm in the granular soil is controlled to be 5%), 3 parts of ZY2 type solid curing agent, 20 parts of broken stone, 20 parts of phosphorous slag and 4 parts of portland cement for later use;
s2, stirring 11 parts of the quick lime and 4 parts of the phosphogypsum at a low speed for 16 hours, grinding the uniformly stirred quick lime and the fly ash, sieving the ground quick lime and the fly ash by a 0.07mm sieve for later use, and meanwhile, crushing the rest of the phosphogypsum by a 0.075mm sieve for later use;
s3, stirring the phosphogypsum sieved by a 0.075mm sieve and the curing agent at a low speed for 2 hours, then adding a mixture of the quick lime and the phosphogypsum sieved by a 0.07mm sieve and fly ash, stirring at a low speed for 4 hours, and then adding the granular soil, the broken stone, the phosphorous slag and the portland cement, and stirring uniformly;
and S4, adding water accounting for 13 percent of the total weight of the materials into the uniformly stirred total materials, and then stirring at a medium speed for 2 min.
Example 2
S1, preparing 71 parts of phosphogypsum (the content of crystal water of the phosphogypsum is 15 percent, and the content of attached water is 5 percent), 11 parts of quicklime (the effective content of calcium oxide is 95 percent), 15 parts of fly ash (the natural water content of the fly ash is 35 percent, and the total content of silicon dioxide, aluminum oxide and iron oxide in the fly ash is not 73 percent, the 0.3mm passing rate is 92 percent, and the 0.075mm passing rate is 76 percent), 8 parts of granular soil (the content of the granular soil with the particle size of 0.425mm in the granular soil is controlled to be 5 percent), 5 parts of ZY2 type solid curing agent, 26 parts of broken stone, 25 parts of phosphorous slag and 5 parts of silicate cement for later use;
s2, stirring 11 parts of the quick lime and 5 parts of the phosphogypsum at a low speed for 16 hours, grinding the uniformly stirred quick lime and the fly ash, sieving the ground quick lime and the fly ash by a 0.07mm sieve for later use, and meanwhile, crushing the rest of the phosphogypsum by a 0.075mm sieve for later use;
s3, stirring the phosphogypsum sieved by a 0.075mm sieve and the curing agent at a low speed for 2 hours, then adding a mixture of the quick lime and the phosphogypsum sieved by a 0.07mm sieve and fly ash, stirring at a low speed for 4 hours, and then adding the granular soil, the broken stone, the phosphorous slag and the portland cement, and stirring uniformly;
and S4, adding water accounting for 14 percent of the total weight of the materials into the uniformly stirred materials, and then stirring at a medium speed for 2 min.
Example 3
S1, preparing 71 parts of phosphogypsum (the content of crystal water of the phosphogypsum is 16 percent, the content of attached water is 3 percent), 12 parts of quick lime (the effective content of calcium oxide is 95 percent), 15 parts of fly ash (the natural water content of the fly ash is 35 percent, the total content of silicon dioxide, aluminum oxide and iron oxide in the fly ash is not 73 percent, the passing rate of 0.3mm is 92 percent, the passing rate of 0.075mm is 76 percent), 9 parts of granular soil (the content of granular soil with the particle size of 0.425mm in the granular soil is controlled to be 5 percent), 4 parts of ZY2 type solid curing agent, 25 parts of broken stone, 25 parts of phosphorous slag and 6 parts of silicate cement for later use;
s2, stirring 12 parts of the quick lime and 4 parts of the phosphogypsum at a low speed for 16h, grinding the uniformly stirred quick lime and the fly ash, sieving the ground quick lime and the fly ash by a 0.07mm sieve for later use, and meanwhile, crushing the rest of the phosphogypsum by a 0.075mm sieve for later use;
s3, stirring the phosphogypsum sieved by a 0.075mm sieve and the curing agent at a low speed for 2.5 hours, then adding a mixture of the quick lime and the phosphogypsum sieved by a 0.07mm sieve and fly ash, stirring at a low speed for 5 hours, and then adding the granular soil, the broken stone, the phosphorous slag and the portland cement, and stirring uniformly;
and S4, adding water accounting for 14 percent of the total weight of the materials into the uniformly stirred materials, and then stirring at a medium speed for 2 min.
Example 4
S1, preparing 72 parts of phosphogypsum (the content of crystal water of the phosphogypsum is 17 percent, and the content of attached water is 4 percent), 12 parts of quick lime (the effective content of calcium oxide is 95 percent), 15 parts of fly ash (the natural water content of the fly ash is 35 percent, and the total content of silicon dioxide, aluminum oxide and iron oxide in the fly ash is not 73 percent, the passing rate of 0.3mm is 92 percent, and the passing rate of 0.075mm is 76 percent), 8 parts of granular soil (the content of granular soil with the particle size of 0.425mm in the granular soil is controlled to be 5 percent), 3 parts of ZY2 type solid curing agent, 1 part of ZY3 type liquid curing agent, 29 parts of broken stone, 27 parts of phosphorous slag and 6 parts of silicate cement for later use;
s2, stirring 12 parts of the quick lime and 5 parts of the phosphogypsum at a low speed for 16h, grinding the uniformly stirred quick lime and the fly ash, sieving the ground quick lime and the fly ash by a 0.07mm sieve for later use, and meanwhile, crushing the rest of the phosphogypsum by a 0.075mm sieve for later use;
s3, stirring the phosphogypsum sieved by a 0.075mm sieve and the curing agent at a low speed for 2.5 hours, then adding a mixture of the quick lime and the phosphogypsum sieved by a 0.07mm sieve and fly ash, stirring at a low speed for 5 hours, and then adding the granular soil, the broken stone, the phosphorous slag and the portland cement, and stirring uniformly;
and S4, adding water accounting for 15 percent of the total weight of the materials into the uniformly stirred materials, and then stirring at a medium speed for 2 min.
Example 5
S1, preparing 72 parts of phosphogypsum (the content of crystal water of the phosphogypsum is 17 percent, and the content of attached water is 5 percent), 12 parts of quick lime (the effective content of calcium oxide is 95 percent), 19 parts of fly ash (the natural water content of the fly ash is 35 percent, and the total content of silicon dioxide, aluminum oxide and iron oxide in the fly ash is not 73 percent, the passing rate of 0.3mm is 92 percent, and the passing rate of 0.075mm is 76 percent), 9 parts of granular soil (the content of granular soil with the particle size of 0.425mm in the granular soil is controlled to be 5 percent), 3.2 parts of ZY2 type solid curing agent, 1 part of ZY3 type liquid curing agent, 32 parts of broken stone, 35 parts of phosphorous slag and 7 parts of silicate cement for later use;
s2, stirring 12 parts of the quick lime and 4.6 parts of the phosphogypsum at a low speed for 16h, grinding the uniformly stirred quick lime and the fly ash, sieving the ground quick lime and the fly ash by a 0.07mm sieve for later use, and meanwhile, crushing the rest phosphogypsum by a 0.075mm sieve for later use;
s3, stirring the phosphogypsum sieved by a 0.075mm sieve and the curing agent at a low speed for 2.5 hours, then adding a mixture of the quick lime and the phosphogypsum sieved by a 0.07mm sieve and fly ash, stirring at a low speed for 5 hours, and then adding the granular soil, the broken stone, the phosphorous slag and the portland cement, and stirring uniformly;
and S4, adding water accounting for 15 percent of the total weight of the materials into the uniformly stirred materials, and then stirring at a medium speed for 3 min.
Example 6
S1, preparing 74 parts of phosphogypsum (the content of crystal water of the phosphogypsum is 17 percent, the content of attached water is 3 percent), 12 parts of quick lime (the effective content of calcium oxide is 95 percent), 19 parts of fly ash (the natural water content of the fly ash is 35 percent, the total content of silicon dioxide, aluminum oxide and iron oxide in the fly ash is not 73 percent, the passing rate of 0.3mm is 92 percent, the passing rate of 0.075mm is 76 percent), 9 parts of granular soil (the content of granular soil with the particle size of 0.425mm in the granular soil is controlled to be 5 percent), 3.8 parts of ZY2 type solid curing agent, 0.2 part of ZY3 type liquid curing agent, 28 parts of broken stone, 28 parts of phosphorous slag and 6 parts of silicate cement for later use;
s2, stirring 12 parts of the quick lime and 5 parts of the phosphogypsum at a low speed for 16h, grinding the uniformly stirred quick lime and the fly ash, sieving the ground quick lime and the fly ash by a 0.07mm sieve for later use, and meanwhile, crushing the rest of the phosphogypsum by a 0.075mm sieve for later use;
s3, stirring the phosphogypsum sieved by a 0.075mm sieve and the curing agent at a low speed for 3 hours, then adding a mixture of the quick lime and the phosphogypsum sieved by a 0.07mm sieve and fly ash, stirring at a low speed for 6 hours, and then adding the granular soil, the broken stone, the phosphorous slag and the portland cement, and stirring uniformly;
and S4, adding water accounting for 15 percent of the total weight of the materials into the uniformly stirred materials, and then stirring at a medium speed for 2 min.
Example 7
S1, preparing 74 parts of phosphogypsum (the content of crystal water of the phosphogypsum is 17 percent, the content of attached water is 6 percent), 12 parts of quick lime (the effective content of calcium oxide is 95 percent), 19 parts of fly ash (the natural water content of the fly ash is 35 percent, the total content of silicon dioxide, aluminum oxide and iron oxide in the fly ash is not 73 percent, the passing rate of 0.3mm is 92 percent, the passing rate of 0.075mm is 76 percent), 9 parts of granular soil (the content of granular soil with the particle size of 0.425mm in the granular soil is controlled to be 5 percent), 3.8 parts of ZY2 type solid curing agent, 0.2 part of ZY3 type liquid curing agent, 28 parts of broken stone, 28 parts of phosphorous slag and 6 parts of silicate cement for later use;
s2, stirring 12 parts of the quick lime and 5 parts of the phosphogypsum at a low speed for 16h, grinding the uniformly stirred quick lime and the fly ash, sieving the ground quick lime and the fly ash by a 0.07mm sieve for later use, and meanwhile, crushing the rest of the phosphogypsum by a 0.075mm sieve for later use;
s3, stirring the phosphogypsum sieved by a 0.075mm sieve and the curing agent at a low speed for 3 hours, then adding a mixture of the quick lime and the phosphogypsum sieved by a 0.07mm sieve and fly ash, stirring at a low speed for 6 hours, and then adding the granular soil, the broken stone, the phosphorous slag and the portland cement, and stirring uniformly;
and S4, adding water accounting for 15 percent of the total weight of the materials into the uniformly stirred materials, and then stirring at a medium speed for 2 min.
Example 8
S1, 74 parts of phosphogypsum (the content of crystal water of the phosphogypsum is 15 percent, the content of attached water is 3 percent), 12 parts of quick lime (the effective content of calcium oxide is 95 percent), 19 parts of fly ash (the natural water content of the fly ash is 35 percent, the total content of silicon dioxide, aluminum oxide and iron oxide in the fly ash is not 73 percent, the passing rate of 0.3mm is 92 percent, the passing rate of 0.075mm is 76 percent), 9 parts of granular soil (the content of the granular soil with the particle size of 0.425mm in the granular soil is controlled to be 5 percent), 3.8 parts of ZY2 type solid curing agent, 0.2 part of ZY3 type liquid curing agent, 28 parts of broken stone, 28 parts of phosphorous slag and 6 parts of silicate cement for later use;
s2, stirring 12 parts of the quick lime and 5 parts of the phosphogypsum at a low speed for 16h, grinding the uniformly stirred quick lime and the fly ash, sieving the ground quick lime and the fly ash by a 0.07mm sieve for later use, and meanwhile, crushing the rest of the phosphogypsum by a 0.075mm sieve for later use;
s3, stirring the phosphogypsum sieved by a 0.075mm sieve and the curing agent at a low speed for 3 hours, then adding a mixture of the quick lime and the phosphogypsum sieved by a 0.07mm sieve and fly ash, stirring at a low speed for 6 hours, and then adding the granular soil, the broken stone, the phosphorous slag and the portland cement, and stirring uniformly;
and S4, adding water accounting for 15 percent of the total weight of the materials into the uniformly stirred materials, and then stirring at a medium speed for 2 min.
Example 9
S1, preparing 75 parts of phosphogypsum (the content of crystal water of the phosphogypsum is 18 percent, the content of attached water is 5 percent), 13 parts of quick lime (the effective content of calcium oxide is 95 percent), 20 parts of fly ash (the natural water content of the fly ash is 35 percent, the total content of silicon dioxide, aluminum oxide and iron oxide in the fly ash is not 73 percent, the passing rate of 0.3mm is 92 percent, the passing rate of 0.075mm is 76 percent), 10 parts of granular soil (the content of granular soil with the particle size of 0.425mm in the granular soil is controlled to be 5 percent), 3.6 parts of ZY2 type solid curing agent, 0.4 part of ZY3 type liquid curing agent, 36 parts of crushed stone, 36 parts of phosphorous slag and 7 parts of silicate cement for later use;
s2, stirring 13 parts of the quick lime and 5 parts of the phosphogypsum at a low speed for 16h, grinding the uniformly stirred quick lime and the fly ash, sieving the ground quick lime and the fly ash by using a 0.07mm sieve for later use, and meanwhile, crushing the rest of the phosphogypsum by using a 0.075mm sieve for later use;
s3, stirring the phosphogypsum sieved by a 0.075mm sieve and the curing agent at a low speed for 3 hours, then adding a mixture of the quick lime and the phosphogypsum sieved by a 0.07mm sieve and fly ash, stirring at a low speed for 6 hours, and then adding the granular soil, the broken stone, the phosphorous slag and the portland cement, and stirring uniformly;
and S4, adding water accounting for 16 percent of the total weight of the uniformly stirred materials into the uniformly stirred materials, and then stirring at a medium speed for 3 min.
Example 10
S1, preparing 76 parts of phosphogypsum (the content of crystal water of the phosphogypsum is 18 percent, the content of attached water is 6 percent), 13 parts of quick lime (the effective content of calcium oxide is 95 percent), 21 parts of fly ash (the natural water content of the fly ash is 35 percent, the total content of silicon dioxide, aluminum oxide and iron oxide in the fly ash is not 73 percent, the passing rate of 0.3mm is 92 percent, the passing rate of 0.075mm is 76 percent), 10 parts of granular soil (the content of granular soil with the particle size of 0.425mm in the granular soil is controlled to be 5 percent), 4 parts of ZY2 type solid curing agent, 1 part of ZY3 type liquid curing agent, 40 parts of broken stone, 40 parts of phosphorous slag and 7 parts of silicate cement for later use;
s2, stirring 13 parts of the quick lime and 5 parts of the phosphogypsum at a low speed for 16h, grinding the uniformly stirred quick lime and the fly ash, sieving the ground quick lime and the fly ash by using a 0.07mm sieve for later use, and meanwhile, crushing the rest of the phosphogypsum by using a 0.075mm sieve for later use;
s3, stirring the phosphogypsum sieved by a 0.075mm sieve and the curing agent at a low speed for 3 hours, then adding a mixture of the quick lime and the phosphogypsum sieved by a 0.07mm sieve and fly ash, stirring at a low speed for 6 hours, and then adding the granular soil, the broken stone, the phosphorous slag and the portland cement, and stirring uniformly;
and S4, adding water accounting for 17% of the total weight of the materials into the uniformly stirred materials, and then stirring at a medium speed for 3 min.
Comparative example 1
S1, preparing 74 parts of phosphogypsum (the content of crystal water of the phosphogypsum is 17 percent, the content of attached water is 3 percent), 12 parts of quick lime (the effective content of calcium oxide is 95 percent), 19 parts of fly ash (the natural water content of the fly ash is 35 percent, the total content of silicon dioxide, aluminum oxide and iron oxide in the fly ash is not 73 percent, the passing rate of 0.3mm is 92 percent, the passing rate of 0.075mm is 76 percent), 9 parts of granular soil (the content of granular soil with the particle size of 0.425mm in the granular soil is controlled to be 5 percent), 3.8 parts of ZY2 type solid curing agent, 0.2 part of ZY3 type liquid curing agent, 28 parts of broken stone, 28 parts of phosphorous slag and 6 parts of silicate cement for later use;
s2, grinding 12 parts of the quick lime, sieving the ground quick lime by using a 0.07mm sieve for later use, and meanwhile, grinding the phosphogypsum by using a 0.075mm sieve for later use;
s3, stirring the phosphogypsum sieved by a 0.075mm sieve and the curing agent at a low speed for 3 hours, then adding a mixture of the quick lime and the phosphogypsum sieved by a 0.07mm sieve and fly ash, stirring at a low speed for 6 hours, and then adding the granular soil, the broken stone, the phosphorous slag and the portland cement, and stirring uniformly;
and S4, adding water accounting for 16 percent of the total weight of the uniformly stirred materials into the uniformly stirred materials, and then stirring at a medium speed for 3 min.
Comparative example 2
S1, preparing 74 parts of phosphogypsum (the content of crystal water of the phosphogypsum is 17 percent, and the content of attached water is 3 percent), 12 parts of quick lime (the effective content of calcium oxide is 95 percent), 19 parts of fly ash (the natural water content of the fly ash is 35 percent, and the total content of silicon dioxide, aluminum oxide and iron oxide in the fly ash is not 73 percent, the passing rate of 0.3mm is 92 percent, and the passing rate of 0.075mm is 76 percent), 9 parts of granular soil (the content of the granular soil with the particle size of 0.425mm in the granular soil is controlled to be 5 percent), 28 parts of broken stone, 28 parts of phosphorous slag and 6 parts of portland cement for later use;
s2, grinding 12 parts of the quick lime, sieving the ground quick lime by using a 0.07mm sieve for later use, and meanwhile, grinding the residual phosphogypsum by using a 0.075mm sieve for later use;
s3, adding the fly ash into the phosphogypsum which is sieved by a 0.075mm sieve, stirring at a low speed for 6 hours, and then adding the granular soil, the broken stone, the phosphorous slag and the portland cement into the phosphogypsum, and stirring uniformly;
and S4, adding water accounting for 16 percent of the total weight of the uniformly stirred materials into the uniformly stirred materials, and then stirring at a medium speed for 3 min.
Comparative example 3
S1, preparing 74 parts of phosphogypsum (the content of crystal water of the phosphogypsum is 17 percent, and the content of attached water is 3 percent), 12 parts of quick lime (the effective content of calcium oxide is 95 percent), 19 parts of fly ash (the natural water content of the fly ash is 35 percent, and the total content of silicon dioxide, aluminum oxide and iron oxide in the fly ash is not 73 percent, the passing rate of 0.3mm is 92 percent, and the passing rate of 0.075mm is 76 percent), 9 parts of granular soil (the content of the granular soil with the particle size of 0.425mm in the granular soil is controlled to be 5 percent), 28 parts of broken stone, 28 parts of phosphorous slag and 6 parts of portland cement for later use;
s2, stirring 12 parts of the quicklime and 5 parts of the phosphogypsum at a low speed for 16h for later use;
s3, stirring the residual phosphogypsum and the curing agent at a low speed for 3 hours, then adding the mixture of the quick lime and the phosphogypsum and the fly ash, stirring at a low speed for 6 hours, and then adding the granular soil, the broken stone, the phosphorous slag and the portland cement, and stirring uniformly;
and S4, adding water accounting for 15 percent of the total weight of the materials into the uniformly stirred materials, and then stirring at a medium speed for 2 min.
Road base layer modules prepared from the base layer materials obtained in examples 1 to 10 and comparative examples 1 and 2 are subjected to performance tests, and the unconfined compressive strengths of the road base layer modules are measured for 7 days, 28 days and 90 days, wherein each of the examples and comparative examples are subjected to 13 groups of parallel tests, the average value is the average value of 13 groups of test tests, and the representative value Rc0.95-1.645S; wherein Rc is an average value; s is the standard deviation (see road engineering inorganic binder stabilized material test regulation (JTG E51-2009)) and the results are shown in table 1; according to the test regulation of inorganic binder stable materials for highway engineering (JTG E51-2009), carrying out static pressure forming at the compaction degree of 98% under the condition of the optimal water content and the maximum dry density of a base material to obtain a test piece with the diameter multiplied by 15 cm; maintaining the prepared test piece for 90 days in a standard maintenance room with the temperature of 20 +/-2 ℃ and the relative humidity of more than or equal to 95%, soaking the test piece in water for 24 hours in the last day of maintenance, taking out the test piece soaked in water for one day and night from the water, and carrying out a splitting test, wherein the test result is shown in table 2; meanwhile, the performance of the cement phosphogypsum stabilized macadam material for the road base is tested after dry and wet cycles and the performance of the cement phosphogypsum stabilized macadam material is tested after freeze-thaw cycles according to the preparation method and the application (201910726767.5), and the test results are shown in table 2.
Table 1: unconfined compressive strength test results
As can be seen from table 1, in the comparative examples and comparative examples, the unconfined compressive strength and early strength of the base material prepared from the modified calcium oxide and the modified phosphogypsum are high; compared with the embodiment 6, the embodiment 7 and the embodiment 8, the water content of the phosphogypsum needs to be strictly controlled, so that the unconfined compressive strength of the base material can be effectively improved; comparing example 6 with comparative example 3, the particle size of the phosphogypsum and the particle size of the limestone have great influence on the unconfined compressive strength of the base material and need to be strictly controlled.
Table 2: test results of dry-wet cycle, freeze-thaw cycle and cleavage test
| Item | Strength after 3 cycles of drying and wetting, MPa | Strength after 3 cycles of freeze thawing, MPa | Cleavage Strength of 90d, MPa |
| Example 1 | 8.5 | 7.6 | 1.23 |
| Example 2 | 7.6 | 7.1 | 1.32 |
| Example 3 | 7.9 | 7.3 | 1.41 |
| Example 4 | 7.1 | 6.7 | 1.48 |
| Example 5 | 6.8 | 6.2 | 1.52 |
| Example 6 | 10.4 | 9.6 | 1.91 |
| Example 7 | 9.1 | 8.5 | 1.89 |
| Example 8 | 9.2 | 8.6 | 1.90 |
| Example 9 | 8.7 | 7.9 | 1.92 |
| Example 10 | 8.5 | 7.8 | 1.88 |
| Comparative example 1 | 6.2 | 5.4 | 1.01 |
| Comparative example 2 | 4.7 | 4.1 | 0.92 |
| Comparative example 3 | 10.2 | 9.5 | 1.21 |
It can be known from table 2 that comparison between examples shows that the strength after dry-wet cycle and the strength after freeze-thaw cycle of a base material can be ensured only by strictly controlling the water content of phosphogypsum, through comparative analysis of examples and comparative examples, the strength after dry-wet cycle, the strength after freeze-thaw cycle and the cleavage strength of 90d of a base material prepared by using modified quicklime and phosphogypsum are greatly improved, and compared with example 6 and comparative example 3, the size of the particle size of the phosphogypsum and the quicklime has a large influence on the cleavage strength of 90d, and the cleavage strength of 0d can be effectively improved after strictly controlling the particle size of the quicklime and the phosphogypsum.
The foregoing is illustrative of the preferred embodiments of this invention, and it is to be understood that the invention is not limited to the precise form disclosed herein and that various other combinations, modifications, and environments may be resorted to, falling within the scope of the concept as disclosed herein, either as described above or as apparent to those skilled in the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. The phosphogypsum highway base material is characterized by being prepared from the following raw materials in parts by weight: 68-76 parts of phosphogypsum, 11-13 parts of quick lime, 13-21 parts of fly ash, 7-10 parts of granular soil, 3-5 parts of curing agent, 30-40 parts of broken stone, 20-40 parts of phosphorous slag and 4-7 parts of silicate cement.
2. The phosphogypsum highway base material according to claim 1, which is characterized in that: the material is prepared from the following raw materials in parts by weight: 74 parts of phosphogypsum, 12.2 parts of quick lime, 18 parts of fly ash, 9 parts of aggregate soil, 4 parts of curing agent, 27 parts of broken stone, 22 parts of phosphorous slag and 4.6 parts of silicate cement.
3. The phosphogypsum highway base material according to claim 1, which is characterized in that: the crystal water content of the phosphogypsum is 15-18%, and the attached water content of the phosphogypsum is 3-6%.
4. The phosphogypsum highway base material according to claim 3, which is characterized in that: the total content of crystal water and attached water of the phosphogypsum is 20 percent.
5. The phosphogypsum highway base material according to claim 1, which is characterized in that: the content of effective calcium oxide in the quicklime is not lower than 95%.
6. The phosphogypsum highway base material according to claim 1, which is characterized in that: the curing agent consists of a solid curing agent and a liquid curing agent, wherein the solid curing agent is 3.8 parts of ZY2 type solid curing agent, and the liquid curing agent is 0.2 part of ZY3 type liquid curing agent.
7. The preparation method of the phosphogypsum highway base material is characterized by comprising the following steps:
s1, preparing 68-76 parts of phosphogypsum, 11-13 parts of quick lime, 13-21 parts of fly ash, 7-10 parts of aggregate soil, 3-5 parts of curing agent, 20-40 parts of broken stone, 20-40 parts of phosphorous slag and 4-7 parts of silicate cement for later use;
s2, stirring 11-13 parts of the quick lime and 4-5 parts of the phosphogypsum at a low speed for 16h, grinding the uniformly stirred quick lime and the fly ash, sieving the ground quick lime and the fly ash by a 0.07mm sieve for later use, and meanwhile, crushing the residual phosphogypsum by a 0.075mm sieve for later use;
s3, stirring the phosphogypsum sieved by a 0.075mm sieve and the curing agent at a low speed for 2-3h, then adding a mixture of the quick lime and the phosphogypsum sieved by a 0.07mm sieve and fly ash, stirring at a low speed for 4-6h, and then adding the granular soil, the broken stone, the phosphorous slag and the portland cement, and stirring uniformly;
s4, adding water accounting for 13-17% of the total weight of the materials into the uniformly stirred materials, and then stirring at medium speed for 2-3 min.
8. The preparation method of the phosphogypsum highway base course material according to claim 7, which is characterized in that: the stirring speed of the low-speed stirring is 40r/min, and the stirring speed of the medium-speed stirring is 70 r/min.
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| CN115594455A (en) * | 2022-06-28 | 2023-01-13 | 安徽建筑大学（Cn） | Preparation method of phosphogypsum pavement base water-stable material |
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