CN104844062A - Nano modified cement mixing pile additive suitable for ocean rock-soil environment and preparation method of additive - Google Patents
Nano modified cement mixing pile additive suitable for ocean rock-soil environment and preparation method of additive Download PDFInfo
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- CN104844062A CN104844062A CN201510208479.2A CN201510208479A CN104844062A CN 104844062 A CN104844062 A CN 104844062A CN 201510208479 A CN201510208479 A CN 201510208479A CN 104844062 A CN104844062 A CN 104844062A
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- mixing pile
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Abstract
The invention provides a nano modified cement mixing pile additive suitable for an ocean rock-soil environment. The nano modified cement mixing pile additive is prepared from suchcomponents in percentage by mass as 25%-35% of nano SiO2, 15%-20% of hyperdispersant, 2-3% of triethanolamine, 0.5%-0.8% of defoamer, 5-10% of calcium chloride and the balance of water, and the sum of the components is 100%. The preparation method of the nano modified cement mixing pile additive comprises the steps of taking the components in the percentage by mass, firstly, adding the hyperdispersant, the defoamer and the calcium chloride to mixing water for stirring and dissolving, filtering out insoluble materials to obtain a solution A, next, adding the nano SiO2 and the triethanolamine to the solution A, and stirring and mixing evenly. The nano modified cement mixing pile additive is capable of greatly improving the early-stage mechanical properties of the cement mixing pile under the ocean rock-soil environment and optimizing the mechanical property development law, and also improving the capability of the cement mixing pile resisting the ocean corrosive environment.
Description
Technical field
The present invention relates to a kind of cement mixing pile additive and preparation method thereof, be particularly useful for the cement mixing pile engineering of ocean, seashore and littoral environment.
Background technology
Cement mixing pile is the simple and effective method for processing foundation of one conventional in engineering.Along with deepening continuously of China ocean and coastland exploitation, numerous ocean, seashore and strand engineering are built, and as one of the principal mode of basement process, cement mixing pile also starts to widely apply in the geotechnical engineering of ocean.
But, there is a large amount of Cl in the Geotechnical Environment of ocean
-, SO
4 2-and Na
+, Mg
2+deng corrosive medium, Cl in some ambient soil underground water
-concentration is more than 10000mg/L, Mg
2+and SO
4 2-concentration also usually can reach 1000mg/L, and the additive effect of these corrosive mediums is extremely unfavorable for the pile of cement mixing pile and the weather resistance of pile body, even jeopardizes the safety of engineering and normal use; In this case, adopt and increase considerably the conventional meanses such as cement consumption and also cannot reach gratifying technique effect.Therefore, how to improve the mechanical property rule of development of cement mixing pile under the Geotechnical Environment of ocean and significantly improve its endurance quality and become the pressing issues that ocean, seashore and strand engineering foundation process face.
Although, there are some at present for the modification method of littoral environment cement mixing pile, such as adopt silica flour, metakaolin or flyash, the mineral admixtures such as lime improve the endurance quality that hydrolysis product of cement composition improves salt erosion environment cement mixing pile, adopt polypropylene fibre, the cement mixing pile shrinkage that natural fiber etc. improve, adopt gypsum, sodium bicarbonate and the agent of sodium hydrogen phosphate equal excitation improve the early stage mechanical property of cement mixing pile, the water-absorbing materials such as polyacrylamide are adopted to improve the anti-permeability performance of cement mixing pile, also the method preparing the high-performance cement soil being applicable to foundation after adopting nano material and fiber to mix with arid soil is had.But these methods all fail the comprehensive angle from the mechanical property rule of development improved under the whole length of time and microstructure, are therefore difficult to the mechanics and the endurance quality that increase substantially ocean Geotechnical Environment cement mixing pile.
invention Inner holds
The object of the invention is to overcome deficiency of the prior art, a kind of nano modification cement mixing pile additive being suitable for ocean Geotechnical Environment and preparation method thereof is provided.
The nano modification cement mixing pile additive of ocean of the present invention Geotechnical Environment, its component and massfraction as follows:
Nano-meter SiO_2
225% ~ 35%;
Hyper-dispersant 15% ~ 20%;
Trolamine 2 ~ 3%;
Defoamer 0.5% ~ 0.8%;
Calcium chloride 5 ~ 10%;
All the other are water, and said components sum is 100%.
In the present invention, described Nano-meter SiO_2
2particle diameter be 30-50nm.
In the present invention, described hyper-dispersant is polycarboxylate water-reducer.
In the present invention, described defoamer is organic silicon polyether composite anti-foaming agent.
The preparation method being suitable for the nano modification cement mixing pile additive of ocean Geotechnical Environment of the present invention, comprises the following steps:
1) get each component by claim 1 proportioning, hyper-dispersant, defoamer and calcium chloride are joined stirring and dissolving in mixing water, cross and filter insolubles, obtain solution A;
2) by Nano-meter SiO_2
2join in solution A with trolamine, be uniformly mixed, obtain the nano modification cement mixing pile additive being suitable for ocean Geotechnical Environment.
Compared with prior art, the invention has the beneficial effects as follows:
Preparation technology of the present invention is simple, due to Nano-meter SiO_2
2nucleus, the composite high-early strength effect of activity and ultra-fine filling effect, trolamine and calcium chloride and the absorption dispersion of hyper-dispersant and soak lubrication, greatly optimize the heat evolution velocity of cement and the mechanical property of cement mixing pile and compaction rate, simultaneously due to Nano-meter SiO_2
2with the hydrated product of defoamer refinement cement and the pore texture of optimization cement mixing pile; under making ocean Geotechnical Environment, the microstructure of whole cement mixing pile is more rationally closely knit; thus significantly improve its resistivity to strand corrosive environment; ensure engineering safety and normal to use, being suitable for the cement mixing pile engineering of ocean, seashore and littoral environment.
Embodiment
Below by way of example, the present invention is further described.
Embodiment 1
1) each component is got by massfraction proportioning: particle diameter is the Nano-meter SiO_2 of 30-50nm
225%; Polycarboxylate water-reducer 15%; Trolamine 2%; Organic silicon polyether composite anti-foaming agent 0.5%; Calcium chloride 5%, all the other are water, and said components sum is 100%.
2) polycarboxylate water-reducer, organic silicon polyether composite anti-foaming agent and calcium chloride are joined stirring and dissolving in mixing water, cross and filter insolubles, obtain solution A; Then by Nano-meter SiO_2
2join in solution A with trolamine, be uniformly mixed, obtain the nano modification cement mixing pile additive being suitable for ocean Geotechnical Environment.
Littoral environment pond sludge, pond sludge is grey black, and stream is moulded, primarily of cohesive soil composition, toughness and dry strength low, water content is 48%; Containing macro-corrosion medium, wherein Na in this environmental groundwter
+, Ca
2+, Mg
2+, Cl
-, SO
4 2-be respectively 6030 Deng leading ion concentration, 805,1295,9005,1250mg/L.
According to nano modification cement mixing pile additive: 42.5 grades of ordinary Portland cements: water: the proportioning of pond sludge=2:15:7.5:100 carries out the cement mixing pile material that mix obtains being mixed with nano modification cement mixing pile additive for 6 minutes.
The cement mixing pile material obtained by aforesaid method builds into 70.7*70.7*70.7mm test specimen, is placed in the underground water of strand and carries out maintenance after form removal.The unconfined compression strength of 30 days, 90 days and 180 days is tested according to " cement-earth mix-design code ", contrast with the test specimen not mixing nano modification cement mixing pile additive: within 30 days, unconfined compression strength is promoted to 2.57MPa from 2.25MPa, and increasing degree is 14.2% simultaneously; Within 90 days, unconfined compression strength is promoted to 4.12MPa from 3.47MPa, and increasing degree is 18.7%; Within 180 days, unconfined compression strength is promoted to 4.68MPa from 3.81MPa, and increasing degree is 18.6%.
Embodiment 2
Nano modification cement mixing pile additive and preparation thereof are with embodiment 1.
Littoral environment pond sludge, pond sludge is grey black, and stream is moulded, primarily of cohesive soil composition, toughness and dry strength low, water content is 48%; Containing macro-corrosion medium, wherein Na in this environmental groundwter
+, Ca
2+, Mg
2+, Cl
-, SO
4 2-be respectively 6030 Deng leading ion concentration, 805,1295,9005,1250mg/L.
According to nano modification cement mixing pile additive: 42.5 grades of ordinary Portland cements: water: the proportioning of pond sludge=2:22:7.5:100 carries out the cement mixing pile material that mix obtains being mixed with nano modification cement mixing pile additive for 6 minutes.
The cement mixing pile material obtained by aforesaid method builds into 70.7*70.7*70.7mm test specimen, is placed in the underground water of strand and carries out maintenance after form removal.The unconfined compression strength of 30 days, 90 days and 180 days is tested according to " cement-earth mix-design code ", contrast with the test specimen not mixing nano modification cement mixing pile additive: within 30 days, unconfined compression strength is promoted to 3.57MPa from 3.31MPa, and increasing degree is 7.9% simultaneously; Within 90 days, unconfined compression strength is promoted to 5.03MPa from 4.24MPa, and increasing degree is 18.6%; Within 180 days, unconfined compression strength is promoted to 5.25MPa from 4.38MPa, and increasing degree is 19.9%.
Embodiment 3
1) each component is got by massfraction proportioning: particle diameter is the Nano-meter SiO_2 of 30-50nm
235%; Polycarboxylate water-reducer 20%; Trolamine 3%; Organic silicon polyether composite anti-foaming agent 0.8%; Calcium chloride 10%; All the other are water, and said components sum is 100%.
2) polycarboxylate water-reducer, organic silicon polyether composite anti-foaming agent and calcium chloride are joined stirring and dissolving in mixing water, filtering insolubles obtains solution A excessively; Then by Nano-meter SiO_2
2join in solution A with trolamine, be uniformly mixed, obtain the nano modification cement mixing pile additive being suitable for ocean Geotechnical Environment.
Littoral environment pond sludge, pond sludge is grey black, and stream is moulded, primarily of cohesive soil composition, toughness and dry strength low, water content is 48%; Containing macro-corrosion medium, wherein Na in this environmental groundwter
+, Ca
2+, Mg
2+, Cl
-, SO
4 2-be respectively 6030 Deng leading ion concentration, 805,1295,9005,1250mg/L.
According to nano modification cement mixing pile additive: 42.5 grades of ordinary Portland cements: water: the proportioning of pond sludge=2:22:7.5:100 carries out the cement mixing pile material that mix obtains being mixed with nano modification cement mixing pile additive for 6 minutes.
The cement mixing pile material obtained by aforesaid method builds into 70.7*70.7*70.7mm test specimen, is placed in the underground water of strand and carries out maintenance after form removal.The unconfined compression strength of 30 days, 90 days and 180 days is tested according to " cement-earth mix-design code ", contrast with the test specimen not mixing nano modification cement mixing pile additive: within 30 days, unconfined compression strength is promoted to 3.98MPa from 3.31MPa, and increasing degree is 20.2% simultaneously; Within 90 days, unconfined compression strength is promoted to 5.54MPa from 4.24MPa, and increasing degree is 30.7%; Within 180 days, unconfined compression strength is promoted to 5.97MPa from 4.38MPa, and increasing degree is 36.3%.
Embodiment 4
Nano modification cement mixing pile additive and preparation thereof are with embodiment 3.
Coastal environment become silted up banket, become silted up banket in lark, stream is moulded, primarily of cohesive soil composition, toughness and dry strength low, water content is 51%; Containing macro-corrosion medium, wherein Na in this environmental groundwter
+, Ca
2+, Mg
2+, Cl
-, SO
4 2-be respectively 7150 Deng leading ion concentration, 1215,1680,11015,1460mg/L.
According to nano modification cement mixing pile additive: 42.5 grades of ordinary Portland cements: water: become silted up banket=proportioning of 2:22:7.5:100 carries out the cement mixing pile material that mix obtains being mixed with nano modification cement mixing pile additive for 6 minutes.
The cement mixing pile material obtained by aforesaid method builds into 70.7*70.7*70.7mm test specimen, is placed in the underground water of strand and carries out maintenance after form removal.The unconfined compression strength of 30 days, 90 days and 180 days is tested according to " cement-earth mix-design code ", contrast with the test specimen not mixing nano modification cement mixing pile additive: within 30 days, unconfined compression strength is promoted to 3.06MPa from 2.23MPa, and increasing degree is 37.2% simultaneously; Within 90 days, unconfined compression strength is promoted to 4.53MPa from 3.16MPa, and increasing degree is 43.4%; Within 180 days, unconfined compression strength is promoted to 4.89MPa from 3.18MPa, and increasing degree is 53.8%.
Method of the present invention, passes through Nano-meter SiO_2 on the one hand
2nucleus, activity and ultra-fine filling effect, significantly improve the early stage hydration rate of cement and the degree of compactness improving middle and later periods cement mixing pile, simultaneously by the composite high-early strength effect of trolamine and calcium chloride and the absorption dispersion of hyper-dispersant with soak lubrication, significantly improve the early mechanics characteristics of cement mixing pile under the Geotechnical Environment of ocean and optimize its mechanical property rule of development, thus improving cement mixing pile to the resistivity of marine corrosion environment; Pass through Nano-meter SiO_2 on the other hand
2with the hydrated product of defoamer refinement cement and the pore texture of optimization cement mixing pile, under making ocean Geotechnical Environment, the microstructure of whole cement mixing pile is more rationally closely knit, thus improves it further to the resistivity of marine corrosion environment.The cement mixing pile engineering of the nano modification cement mixing pile additive particularly suitable Yu Haiyang of this ocean Geotechnical Environment, seashore and littoral environment.
What more than enumerate is only specific embodiments of the invention.Obviously, the invention is not restricted to above examples of implementation, in the protection domain of spirit of the present invention and claim, any amendment make the present invention and change, all should think protection scope of the present invention.
Claims (5)
1. be suitable for a nano modification cement mixing pile additive for ocean Geotechnical Environment, it is characterized in that its component and massfraction as follows:
Nano-meter SiO_2
225% ~ 35%;
Hyper-dispersant 15% ~ 20%;
Trolamine 2 ~ 3%;
Defoamer 0.5% ~ 0.8%;
Calcium chloride 5 ~ 10%;
All the other are water, and said components sum is 100%.
2. the nano modification cement mixing pile additive being suitable for ocean Geotechnical Environment according to claim 1, is characterized in that described Nano-meter SiO_2
2particle diameter be 30-50nm.
3. the nano modification cement mixing pile additive being suitable for ocean Geotechnical Environment according to claim 1, is characterized in that described hyper-dispersant is polycarboxylate water-reducer.
4. the nano modification cement mixing pile additive being suitable for ocean Geotechnical Environment according to claim 1, is characterized in that described defoamer is organic silicon polyether composite anti-foaming agent.
5. prepare the method being suitable for the nano modification cement mixing pile additive of ocean Geotechnical Environment according to claim 1, it is characterized in that comprising the following steps:
1) get each component by claim 1 proportioning, hyper-dispersant, defoamer and calcium chloride are joined stirring and dissolving in mixing water, cross and filter insolubles, obtain solution A;
2) by Nano-meter SiO_2
2join in solution A with trolamine, be uniformly mixed, obtain the nano modification cement mixing pile additive being suitable for ocean Geotechnical Environment.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105906226A (en) * | 2016-04-14 | 2016-08-31 | 杭州来宝得新材料科技有限公司 | Cement mixing pile composite additive, curable material and preparation method of composite additive |
| CN106431051A (en) * | 2016-09-06 | 2017-02-22 | 广东华路交通科技有限公司 | Composite additive adapted to Guangdong coastal deep soft soil rapid pile-forming cement mixing pile |
| CN107032650A (en) * | 2016-11-25 | 2017-08-11 | 新沂市中诺新材料科技有限公司 | It is a kind of to be used to strengthen the concrete and its additive of anti-pressure ability |
| CN112028534A (en) * | 2020-08-25 | 2020-12-04 | 北京金隅水泥节能科技有限公司 | Early-strength water reducing agent, production process and application thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105906226A (en) * | 2016-04-14 | 2016-08-31 | 杭州来宝得新材料科技有限公司 | Cement mixing pile composite additive, curable material and preparation method of composite additive |
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| CN106431051A (en) * | 2016-09-06 | 2017-02-22 | 广东华路交通科技有限公司 | Composite additive adapted to Guangdong coastal deep soft soil rapid pile-forming cement mixing pile |
| CN107032650A (en) * | 2016-11-25 | 2017-08-11 | 新沂市中诺新材料科技有限公司 | It is a kind of to be used to strengthen the concrete and its additive of anti-pressure ability |
| CN112028534A (en) * | 2020-08-25 | 2020-12-04 | 北京金隅水泥节能科技有限公司 | Early-strength water reducing agent, production process and application thereof |
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| CN104844062B (en) | 2017-03-22 |
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