CN104326716A - Modified low-carbon raw soil cement and preparation method thereof - Google Patents
Modified low-carbon raw soil cement and preparation method thereof Download PDFInfo
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- CN104326716A CN104326716A CN201410553908.5A CN201410553908A CN104326716A CN 104326716 A CN104326716 A CN 104326716A CN 201410553908 A CN201410553908 A CN 201410553908A CN 104326716 A CN104326716 A CN 104326716A
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Abstract
The invention discloses modified low-carbon raw soil cement and a preparation method thereof. The raw soil cement is prepared from the following raw materials by weight percentage: 40-60% of clay, 20-45% of cement, 0-15% of gypsum, 0-12% of expanding agent and a water reducing agent which is 1-2wt% of the above raw materials; the preparation method can reduce the carbon emission, saves resources and energy, is an energy-saving and environment-friendly material, is different from the existing building materials, has no influence on environment when being discarded, can enter a natural circulation system when being crushed and dispersed in soil, can be utilized in quantity or can contain poor-quality soil, and has good crack resistance and water resistance.
Description
Technical field
The present invention relates to a kind of modified raw soil cement and preparation method thereof, belong to building material technical field.
Background technology
Earth building material take soil as main raw material, can be widely used in construction work after different methods process.The starting material of earth building material are widely distributed, take conveniently, with low cost; The maximum advantage of raw soil building material is the contribution for energy-conserving and environment-protective, pulverizes and can be sprinkled in soil, enter in natural cycle system after it is discarded.It is while being utilized as resource, does not cause any pollution hidden trouble and sequela to environment, and this advantage is that other building materials all can not realize.
Intensity and the water resisting property of raw soil material are lower, and people mainly adopted compacting method to prepare earth building material in the past; Occurred again that replacing part of clay with cement bond sandstone prepared clay concrete for playing all not high seepage control of dam wall of mould, requirement of strength afterwards, the intensity of this building materials is generally about 10MPa.
At present, Chinese scholars studying the immature soil is carried out inorganic modified, organically-modified with the intensity increasing the immature soil." the preparation and property research of immature soil activation gelling material " literary composition as interim in " New Building Materials " 2010 the 10th, the technological approaches of alkali-activated material is adopted to configure immature soil cement, its ratio is the immature soil: slag: glue sand: exciting agent: water: straw=4:6:30:1:4.5:0.2,28d cement mortar strength can reach 45.34MPa, and coefficient of softening is 0.96.The main weak point of this immature soil cement is: 1. immature soil utilization ratio is lower, and need consume a large amount of consolidating material resources; 2. containing a large amount of overbased materials, there is impact to environment and be unfavorable for cycling and reutilization; 3. unresolved low flow problem of newly mixing raw soil material; 4. production cost is higher.
The present inventor utilizes modern cement-base composite material technology of preparing, prepares a kind of low-carbon type modified raw soil cement of high strength, and being improved by ancient raw soil building material becomes the building materials with higher-strength and good durability, can be widely used in rural construction.
Summary of the invention
The present inventor, with the practical experience of oneself, develops a kind of low-carbon type modified raw soil cement after lot of experiments.Immature soil cement of the present invention has material volume good stability, intensity is high, splitting resistance good, the feature that immature soil utilization ratio is high.
Low-carbon type modified raw soil cement of the present invention, is made up of the component of following weight ratio: 40 ~ 60% clays, 20 ~ 45% cement, 0 ~ 15% gypsum, the water reducer of 0 ~ 12% swelling agent and these component total amounts 1 ~ 2%.
Described clay can be general clay, also can be inferior soil; Inferior soil is as municipal sludge, saline soil, sandization soil, riverway sludge etc.
Described water reducer is a kind of in lignin water reducer, naphthalene water reducer, polycarboxylate water-reducer or their mixture;
Described cement is 42.5 strength grade silicate cement or ordinary Portland cements;
Described gypsum is that waste gypsum forms through calcining.
In order to obtain better effect, preferably: weight ratio ingredient is: 40 ~ 60% clays, 20 ~ 45% cement, 5 ~ 15% gypsum, the water reducer of 5 ~ 12% swelling agents and these component total amounts 1 ~ 2%.
Meanwhile, can according to the concrete environment for use of immature soil cement building material and standard-required, with the cement in pulverized fuel ash cement, slag cement, trass cement alternative compositions.
Low-carbon type modified raw soil cement of the present invention can by method preparation below, and step comprises:
1) get the raw materials ready
Clay, cement, gypsum, swelling agent, each component of water reducer is got in described ratio; Clay is crossed 0.075mm sieve, removing impurity, for subsequent use.
2) compound is prepared
Each component is put into container, after being uniformly mixed equal Uniform, adds water and water reducer wherein, continue to stir equal Uniform, make compound, ratio of water to material is 0.2 ~ 0.3; Then vibratory compaction is poured into a mould.
3) immature soil cement is prepared
By step 2) compound of casting prepared, be poured in mould; With vibration mode make the compound in mould closely knit shaping, then through 4 hours quiet stop after form removal, obtain immature soil cement of the present invention.
Mechanism of the present invention:
Immature soil dispersion mechanism: the activity of soil also has inseparable relation with clay mineral, clay mineral is the main substance of solid phase of soil, account for more than 90% of solid phase of soil total mass, clay mineral has dispersity and the polarity of height, thus a large amount of surface free energies is had, they make soil obtain the feature of colloidal dispersion, and clay mineral surface is due to lattice replacement, aquation dissociation, broken key effect and selective adsorption effect etc., usually with uncompensated electric charge, they are in saturated compared with the ion institute of unbound state, concerning mainly positively charged ion most clay.In order to the electric neutrality of maintenance system, Clay Colloids microparticle surfaces is often saturated and form counter-ion layet by the ion institute of dissociating, so electronegative clay mineral surface constitutes electrostatic double layer with the positively charged ion diffusion layer being close to it, its distribution is what to reduce gradually with the increase of distance, a part is connected with set sheath, form inactive adsorption layer, another part and intergranular solution altogether, form the diffusion layer of ion.Lignin water reducer, naphthalene water reducer and polycarboxylate water-reducer are analog anion surfactants, positively charged ion on grogs can neutralize and make its surface band like charges by its negatively charged ion dissociating out, increase the repulsive force between grogs, can make the microparticulate of soil, its dissemination depends on electrostatic interaction.
The immature soil excites, coking mechanism: in soil, the surface functional groups at the scission of link place, edge of oxides in clay fraction, oxyhydroxide, allophanoid and layer silicate mineral is all hydroxyl, and the increasing of hydroxyl groups can increase combination between grogs and agglutinate and reaction.SiO
2gel and colloidal state Ca (OH)
2can cementing grogs, directly play reinforcement effect, the ultimate compression strength of soil improves, and speed of response is accelerated.When activation, compacted soil, binder is had an effect with the colloid film wrapping grogs with the micelle grain of soil often, instead of has an effect with the former grain of soil, and this have impact on the effect of binder and clay particle itself, has seriously fettered active Si0 in soil
2, A1
2o
3stripping and agglutinate react, reduce soil activation; So should first consider it first to disperse to excite when exciting clay, the effect improving soil activation can be better again.Immature soil strength of cement forms and is divided into 4 levels: the inherent structure of soil, physically improved, hardening of cement, hard solidifying reaction, wherein the contribution of hardening of cement to intensity is maximum.The formation of immature soil cement structures is formed by gelling hydrate parcel binder soil soil particle, cementing properties hydrate or swelling property hydrate filling soil inter-granular porosity, the extruding of swelling property hydrate and filling soil intraparticle pores.In addition, the hard strength of joint coagulating reaction and can improve between soil particle clay.For the immature soil that clay is main, because cementing properties hydrate can not the intragranular hole of filling soil, simultaneously again can not complete coated soil particle, so must reinforce with containing swelling property hydrate, the hole between clay can be eliminated and obtain the highest solidification intensity.
Advantage and disadvantage of the present invention:
1. propose the thinking of immature soil cement first, opened up a new approach for preparing high-performance and low-cost cement, the new countryside construction for vast rural area provides high-performance building materials, can be widely used in the construction of the road in rural area, house, bank protection etc.
2. environmental protection and energy saving.Reduce carbon emission amount, economize on resources and the energy.
3. can utilize in a large number or contain inferior soil, be conducive to environment protection and environment is clean and tidy.
4. immature soil cement fluidity of the present invention is good, protection construction environment; Intensity is high, shrinks few.
5. cost is lower.The present invention make use of clay in a large number, and only adopt a small amount of modified component to carry out modification to the immature soil, thus production cost is lower.
6. splitting resistance is good.Significantly improve the aesthetic property of earth building.
7. water resisting property is good.Reduce the porosity of the immature soil, its water resisting property and volume stability are improved.
Embodiment
In order to understand the present invention, being described in further detail below, not limiting the present invention.The description of this part is only exemplary and indicative.
Embodiment 1
Get general clay, cross 0.075mm sieve, removing impurity.Get clay 50% cement 40% by weight, the lignin water reducer of swelling agent 10% and three kind of component total amount 2%; Cement is the ordinary Portland cement of 42.5 strength grades.
Clay, cement, swelling agent are put into container and be uniformly mixed equal Uniform; Add water and water reducer again, ratio of water to material is 0.25, continues to stir equal Uniform, obtains immature soil cement admixture, then pours into a mould vibratory compaction; By the compound of casting, be poured in mould, make the compound in mould closely knit shaping with mode of vibration, quietly afterwards stop 4 hours, form removal; Obtain immature soil cement of the present invention.
Embodiment 2
Get sieved clay 55% by weight, the naphthalene water reducer of cement 35%, gypsum 10% and aforementioned three kinds of component total amounts 2%;
All the other operate with embodiment 1, and ratio of water to material is 0.21, obtain immature soil cement of the present invention.
Embodiment 3
Get the water reducer of sieved clay 50%, cement 45%, swelling agent 5% and aforementioned three kinds of component total amounts 1% by weight; Water reducer is by 0.4% xylogen and 0.6% naphthalene system composite water-reducing agent is composite forms;
All the other operate with embodiment 1, and ratio of water to material is 0.25, obtain immature soil cement of the present invention.
Test example:
To the low-carbon type modified raw soil cement that the present embodiment 1 ~ 3 is prepared, carry out strength test.
Method is carried out according to GB/T17671-1999 " Test method for strength of hydraulic cement mortar (ISO method) ".Coefficient of softening is after reaching 28d curing age with modified raw soil cement, soaks again that the 28d ultimate compression strength of 1 day and 28d curing age intensity ratio calculate in water.
| Embodiment | 28 days ultimate compression strength/MPa | Coefficient of softening/% |
| 1 | 35.8 | 0.81 |
| 2 | 32.4 | 0.78 |
| 3 | 40.0 | 0.92 |
From above-mentioned test-results: 28 days ultimate compression strength of immature soil cement of the present invention are up to 40MPa, and coefficient of softening can reach more than 0.75.
Result shows: the intensity of modified raw soil cement of the present invention is higher, water-tolerant.The performance of the modified raw soil cement adopting the inventive method to prepare can meet cement needs required in road cement in new countryside construction, masonry cement and water conservancy slope protection works completely.
Embodiment 4
Get sieved clay 55% cement 30% by weight, gypsum 10%, the lignin water reducer of swelling agent 5% and aforementioned four all component total amounts 2%;
All the other operate with embodiment 1, and ratio of water to material is 0.21, obtain immature soil cement of the present invention.
Embodiment 5
Clay 40%, the polycarboxylate water-reducer of cement 40%, gypsum 15%, swelling agent 5% and aforementioned four kinds of component total amounts 2%.
All the other operate with embodiment 1, and ratio of water to material is 0.23, obtain immature soil cement of the present invention.
Embodiment 6
Clay 50%, the water reducer of cement 20%, gypsum 15%, swelling agent 15% and aforementioned four kinds of component total amounts 2%; Water reducer is by 0.4% xylogen and 0.6% naphthalene system composite water-reducing agent is composite forms.
All the other operate with embodiment 1, and ratio of water to material is 0.22, obtain immature soil cement of the present invention.
Claims (3)
1. a low-carbon type modified raw soil cement, is characterized in that being made up of the component of following weight ratio: 40 ~ 60% clays, 20 ~ 45% cement, 0 ~ 15% gypsum, the water reducer of 0 ~ 12% swelling agent and these component total amounts 1 ~ 2%;
Described clay can be general clay, also can be inferior soil;
Described water reducer is a kind of in lignin water reducer, naphthalene water reducer, polycarboxylate water-reducer or their mixture;
Described cement is 42.5 strength grade silicate cement or ordinary Portland cements;
Described gypsum is that waste gypsum forms through calcining.
2. a kind of low-carbon type modified raw soil cement as claimed in claim 1, is characterized in that being made up of the component of following weight ratio: 40 ~ 60% clays, 20 ~ 45% cement, 5 ~ 15% gypsum, the water reducer of 5 ~ 12% swelling agents and these component total amounts 1 ~ 2%.
3. the preparation method of a kind of low-carbon type modified raw soil cement as claimed in claim 1, step comprises:
1) get the raw materials ready
Clay, cement, gypsum, swelling agent, each component of water reducer is got in described ratio; Clay is crossed 0.075mm sieve, removing impurity, for subsequent use;
2) compound is prepared
Each component is put into container, after being uniformly mixed equal Uniform, adds water and water reducer wherein, continue to stir equal Uniform, make compound, ratio of water to material is 0.2 ~ 0.3; Then vibratory compaction is poured into a mould;
3) low-carbon type modified raw soil cement is prepared
By step 2) compound of casting prepared, be poured in mould; With vibration mode make the compound in mould closely knit shaping, then through 4 hours quiet stop after form removal, to obtain final product.
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Cited By (4)
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|---|---|---|---|---|
| CN105152610A (en) * | 2015-10-12 | 2015-12-16 | 天津城建大学 | Method for modifying raw soil material by utilizing starch residue |
| CN106517973A (en) * | 2016-10-31 | 2017-03-22 | 天津城建大学 | Modified raw soil material for foundation and preparation method thereof |
| CN113135724A (en) * | 2021-04-19 | 2021-07-20 | 扬州邗江中科南工建设工程与信息化研究中心 | Negative carbon emission modified raw soil base building block and manufacturing method thereof |
| CN114716220A (en) * | 2022-03-23 | 2022-07-08 | 中建八局第三建设有限公司 | Phosphogypsum raw soil composite humidity-controlling material and preparation method thereof |
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| CN114716220A (en) * | 2022-03-23 | 2022-07-08 | 中建八局第三建设有限公司 | Phosphogypsum raw soil composite humidity-controlling material and preparation method thereof |
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Application publication date: 20150204 |
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