CN103626457B - A kind of corrosion resistant concrete for salt marsh environment and preparation method thereof and construction technology - Google Patents

A kind of corrosion resistant concrete for salt marsh environment and preparation method thereof and construction technology Download PDF

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CN103626457B
CN103626457B CN201310688307.0A CN201310688307A CN103626457B CN 103626457 B CN103626457 B CN 103626457B CN 201310688307 A CN201310688307 A CN 201310688307A CN 103626457 B CN103626457 B CN 103626457B
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concrete
salt marsh
slag
corrosion resistant
marsh environment
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CN103626457A (en
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程寅
黄新
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Beihang University
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Abstract

The invention discloses a kind of corrosion resistant concrete for salt marsh environment and making and construction technology, described salt marsh environment is salt content 1%-30%(quality percentage composition), the salinized soil of water content 20%～150% or the bittern environment that salinity is 10g/L-500g/L, described concrete raw material comprises: slag, light calcined magnesia, lime, water, aggregate and mineral admixture. By interacting between the each component of this concrete and with the salinity in salt marsh environment, ensure concrete setting and harden, Emergence and Development the long-term intensity that keeps in salt marsh environment. This kind of the reinforcement of concrete, in the various salt marsh environment including salinized soil and bittern, can meet structures, member to concrete strength and life requirement.

Description

A kind of corrosion resistant concrete for salt marsh environment and preparation method thereof and construction technology
(1) technical field:
The invention belongs to civil engineering material field, specifically, is a kind of corrosion resistant concrete for salt marsh environmentAnd preparation method thereof and construction technology.
(2) background technology:
China is distributed with large-area salinized soil, particularly the salinized soil salt content of western Salt Lake Area and the coastal region in east ChinaHigh, saliferous kind is many, at these regional Construction structures, must consider corrosion-resistant to salt marsh environment of structures and memberPerformance. Salt marsh environment mainly comprises dampness or all kinds of salinized soil below level of ground water and bittern environment, its saliferousDivide and be mainly containing potassium (K+), sodium (Na+), magnesium (Mg 2+), calcium (Ca2+) villaumite (Cl-), sulfate (SO4 2-) and carbonate (CO3 2-)，Their concrete based on silicate series cement and reinforcing bars to current use produce heavy corrosion effect, thereby to coagulationThe durability of soil and reinforced concrete member constitutes a serious threat. Concrete and armored concrete are that structures are requisitePart, but in salt marsh environment, its application is very limited. Therefore can be at salting hooping in the urgent need to seeking oneSetting and harden, generation the long-term novel corrosion resistant concrete material that keeps intensity in border, to meet the engineering of salt marsh environmentApplication requirements.
(3) summary of the invention:
The present invention is for solving the concrete endurance issues of structures in salt marsh environment, provides a kind of for salt marsh environmentCorrosion resistant concrete and preparation method thereof and construction technology. The present invention adopts slag, activated magnesia as Binder Materials,Be mixed and made into concrete with water, coarse-fine aggregate, mineral admixture, containing as slag, the activated magnesia of Binder MaterialsNa+、K+、Ca2+、Mg2+、Cl-、SO4 2-、CO3 2-Etc. hydration and hardening in the salt marsh environment of several or multiple salt ion,And slag, activated magnesia react with the part salinity in salt marsh environment and generate a large amount of new hyratesMg6Al2(OH)16CO3·4H2O (HT) and Ca4Al2O6Cl2·10H2O (Fs), these two kinds of new hyrates are as the master of cementing strengthWant contributor, it is good water stability and salt erodibility endurance in salt marsh environment, has ensured the stable and very strong of concrete strengthSalt tolerant erosion ability. This concrete can coordinate enhancing muscle to use also can use separately to make use in salt marsh environment resistance toCorrosion member and structures.
The concrete proportioning of a kind of corrosion resistant concrete for salt marsh environment of the present invention, according to territory of use's salt marshIn soil or bittern, salinity kind and ratio, concentration are determined, calculate by weight, are prepared from by the raw material of following component:Slag: 100～800 parts; Activated magnesia powder: 40～300 parts; Lime: 0～300 part; Mineral admixture: 50～400Part; Coarse aggregate: 200～1600 parts; Fine aggregate: 100～900 parts; Water: 100～400 parts. Described slag specific area is notBe less than 250m2/ kg; Described activated magnesia specific area is not less than 300m2/ kg; Described lime can be quick lime, ripeLime or both compositions; Described mineral admixture can adopt flyash, silicon ash, slag, non-ferrous metal slag, redMud mine tailing, calcining coal gangue powder etc. meet the mineral admixture of particle diameter requirement, can be wherein a kind of or by several mixedClose and form, the specific area of described flyash is not less than 400m2/ kg, the specific area of silicon ash is not less than 15000m2/kg，The specific area of ground steel slag and non-ferrous metal slag is not less than 350m2/ kg, the specific area of red mud mine tailing is not less than300m2/ kg, the specific area of calcining coal gangue powder is not less than 300m2/ kg; Described thick, fine aggregate is according to existing concreteSpecification is selected; The bittern that described water can use fresh water also can use job site to gather materials on the spot.
A kind of corrosion resistant concrete for salt marsh environment provided by the invention, is containing Na+、K+、Ca2+、Mg2+、Cl-、SO4 2-、CO3 2-In salt marsh environment etc. several or multiple salt ion, in concrete Binder Materials can with salt marsh environment in portionPoint reactant salt generate the hydrated products such as HT, Fs make concrete in moist salinized soil or bittern environment setting and harden, generation,Development long-term maintenance intensity, and the salt marsh environment of high saliferous is more conducive to the application of corrosion resistant concrete of the present invention. ThisThe applicable salt marsh environment of bright described concrete is: 1. salinized soil is salt content 1%-30%(quality percentage composition), water content20%～150% salinized soil, comprises chlorine saline soil, Restrain Method of Sulphate Salty soil, carbonic acid salinized soil, sub-chlorine saline soil and sulphiteStain soil etc. 2. the bittern environment that salinity is 10g/L-500g/L, in bittern, leading ion salinity scope is (g/L): K+WithNa+：4.5～240，Ca2+：0.5～65，Mg2+：0.5～50.5，Cl-：4.5～180，SO4 2-：2.5～150.5，CO3 2-：0.3～45。
A kind of corrosion resistant concrete for salt marsh environment of the present invention, according to structures kind difference, its applicationMethod is also not quite similar. In the work progress of structures, according to service condition difference, can be that cast-in-place concrete is constructedThing or member can be also precast concretes; According to the specific requirement of Concrete Design, select whether to use reinforcement.The muscle material of reinforcement can use: through antiseptic reinforcing bar, include but not limited to stainless steel, resinous coat reinforcing bar;Non-ferrous metal muscle material, includes but not limited to aluminium alloy muscle material; FRP muscle material, includes but not limited to fiberglass reinforced plastics(GFRP) muscle, carbon fibre reinforced plastic (CFRP) muscle, aromatic polyamide fiber reinforced plastics (AFRP) muscle; StringMuscle material, includes but not limited to the bamboo silk rope that bamboo reinforcement, reed muscle, bamboo silk are worked out.
A kind of corrosion resistant concrete for salt marsh environment of the present invention, this concrete is as structures and memberConstruction material, its preparation method and construction technology are: salinity kind, concentration and ratio to the regional salting hooping border of constructing are enteredRow is measured, and determines the concrete proportioning of corrosion resistant concrete according to the saliferous kind of concrete salt marsh environment of living in and salt content;Determine after each component proportion, slag, activated magnesia, lime, mineral admixture, aggregate fully mixed according to proportioning,Add wherein again water, stir and obtain concrete materials, then execute by existing known concrete construction processWork and maintenance. As using concrete for making prefabricated components of the present invention, curing age is 7～28 days, curing condition: temperature is20 ± 2 DEG C, air humidity >=95%.
The invention has the advantages that:
(1) corrosion resistant concrete provided by the invention can be in salt marsh environment setting and harden, development keep intensity, be suitable forIn the salinized soil that cannot use in Portland cement concrete and bittern environment;
(2) when corrosion resistant concrete provided by the invention uses in bittern, do not need to re-use other method and carry out anticorrosionProtection, work progress simply, easily operation;
(3) lower cost for material needing in corrosion resistant concrete preparation provided by the invention, being applicable to large-scale engineering shouldWith.
(4) detailed description of the invention:
A kind of corrosion resistant concrete for salt marsh environment provided by the invention, is applicable to the structures in various salt marsh environmentAnd member, as pierhead trestle basis, wave resistance dykes and dams, salt lake bittern pond, bittern canal and other may be subject to that salt marsh corrodes eachClass structures and member basis.
Applicant studies discovery: utilize slag, activated magnesia as Binder Materials, mix with water, coarse-fine aggregate, mineralClose material and mix by a certain percentage the concrete making, can not only be in salt marsh environment setting and harden, produce and develop intensity,And can in salt marsh environment, keep intensity and good durability. As the slag of Binder Materials, activated magnesia at saltHydration and hardening in stain environment, reacts and generates a large amount of new hyrates with the salinity in salt marsh environmentMg6Al2(OH)16CO3·4H2O (HT) and Ca4Al2O6Cl2·10H2O (Fs), these two kinds of new hyrates are as the master of cementing strengthWant contributor, be significantly different from hydrolysis product of cement CSH, HT and Fs must could generate in a large number and carry in salt marsh environmentFor intensity, this feature makes to utilize slag, activated magnesia to have good salt erodibility endurance as the concrete of Binder Materials,Ensure concrete strength stablizing with durable in salt marsh environment, thereby also proposed a kind of corrosion resistant that is applicable to salt marsh environmentLose concrete preparation method.
The invention provides a kind of corrosion resistant concrete for salt marsh environment, applicable salt marsh environment is: 1. salinized soil isSalt content 1%-30%(quality percentage composition), the salinized soil of water content 20%～150%, comprise chlorine saline soil, sulfateStain soil, carbonic acid salinized soil, sub-chlorine saline soil and sulfurous acid salt marsh soil etc. 2. the bittern environment that salinity is 10g/L-500g/L,In bittern, leading ion salinity scope is (g/L): K+And Na+：4.5～240，Ca2+：0.5～65，Mg2+：0.5～50.5， Cl-：4.5～180，SO4 2-：2.5～150.5，CO3 2-：0.3～45。
The concrete proportioning of a kind of corrosion resistant concrete for salt marsh environment of the present invention, calculates by weight, byThe raw material of following component is prepared from: slag: 100～800 parts; Activated magnesia powder: 40～300 parts; Lime: 0～300Part; Mineral admixture: 50～400 parts; Coarse aggregate: 200～1600 parts; Fine aggregate: 100～900 parts; Water: 100～400Part. Described slag specific area is not less than 250m2/ kg; Described activated magnesia specific area is not less than 300m2/ kg; InstituteStating lime can be quick lime, white lime or both compositions; Described mineral admixture can adopt flyash, silicon ash,Slag, red mud mine tailing, non-ferrous metal slag, calcining coal gangue powder etc. meet the mineral admixture of particle diameter requirement, Ke YishiWherein a kind of or mixed by several, the specific area of described flyash is not less than 400m2/ kg, the specific surface of silicon ashThe long-pending 15000m that is not less than2/ kg, the specific area of ground steel slag and non-ferrous metal slag is not less than 350m2/ kg, red mud mine tailingSpecific area be not less than 300m2/ kg, the specific area of calcining coal gangue powder is not less than 300m2/ kg; Described slightly, carefully collectionMaterial is selected according to existing concrete specification; The halogen that described water can use fresh water also can use job site to gather materials on the spotWater.
A kind of corrosion resistant concrete for salt marsh environment providing in the present invention is made a strength test, adopt respectively slag,Activated magnesia and Portland cement as Binder Materials gather materials with mineral admixture, thickness, bittern mixes mixing and becomesConcrete, it is in the die trial of 150mm concrete cube that jolt ramming packs the length of side into, sclerosis the demoulding after respectively by above-mentioned coagulating cementSoil and slag, activated magnesia concrete are directly soaked in fresh water, bittern and bury and be overlying in salinized soil, environment temperature controlAt 20 ± 2 DEG C. In test, concrete proportioning meets above-mentioned concrete proportioning scope, the concrete material fiting ratio phase of two classesWith, to test bittern used, salinized soil and all take from certain saline soil area, the concentration in salinized soil and bittern is of the present inventionSalt marsh environment concentration range in. Concrete strength is tested according to " standard for test methods of mechanical properties of ordinary concrete "(GB/T50081-2002) carry out, each concrete crushing strength is respectively in shown in table 1, table 2:
Table 1 cement concrete is intensity contrast in fresh water, bittern and salinized soil
Time 3 days 7 days 28 days 90 days 180 days 360 days
Compression strength in fresh water (MPa) 23.3 28.6 30.5 31.2 30.8 29.7
Compression strength in bittern (MPa) 24.2 27.8 31.9 29.6 24.4 18.6
Compression strength in salinized soil (MPa) 23.2 26.8 29.8 28.6 23.9 20.7
Table 2 slag, activated magnesia concrete intensity contrast in fresh water, bittern and salinized soil
Time 3 days 7 days 28 days 90 days 180 days 360 days
Compression strength in fresh water (MPa) 20.1 20.8 21.9 21.6 22.4 22.1
Compression strength in bittern (MPa) 25.3 28.2 34.8 35.2 37.9 38.5
Compression strength in salinized soil (MPa) 23.6 26.6 31.9 32.7 33.6 34.8
Data from table, under various curing conditions, a kind of corrosion-resistant mixed for salt marsh environment provided by the inventionSolidifying soil-slag, activated magnesia concrete strength are significantly better than cement concrete, especially in bittern and salinized soil environment,Intensity is 2-5 times of cement concrete strength; And slag, the intensity of activated magnesia concrete in bittern and salinized soil are brightShow higher than it intensity in fresh water, and the intensity of concrete in bittern and salinized soil increases along with time lengthening.Result of the test explanation a kind of corrosion resistant concrete material for salt marsh environment of the present invention can be applied to salting hoopingIn border, and keep intensity stabilization and good salt erodibility endurance, meet structures in salt marsh environment to strength grade of concreteRequirement.
Below in conjunction with embodiment, a kind of corrosion resistant concrete for salt marsh environment provided by the invention is done furtherlyBright, but the concrete scope of application provided by the invention is not limited only to this.
Embodiment 1:
The chemical industry concentraing pond that floor space is about 30000m2 is built in certain Salt Lake Area, learns this ground according to engineering investigation reportThe salt content of district's salinized soil is 26.8%, and the content of leading ion is: Ca2+：1.2%，Mg2+：2.8%，K+/Na+：9.5%，SO4 2-：2.7%，Cl-：10.3%，HCO3 -/CO3 2-: 0.1%. In concentraing pond, the salinity of bittern to be stored is 360g/L,The salinity of leading ion is (g/L): K+/Na+：131.35，Ca2+：24.32，Mg2+：45.02，Cl-：206.43，SO4 2-：23.68，HCO3 -/CO3 2-: 0.12. According to bittern to be stored in salinized soil saliferous kind and salt content, concentraing pondSalinity, prepare corrosion resistant concrete by the weight portion of following raw material:
Slag: 700 parts; Activated magnesia powder: 300 parts; Lime: 200 parts; Mineral admixture: 350 parts; Rough setMaterial: 1500 parts; Fine aggregate: 850 parts; Water: 400 parts. Wherein, slag specific area is 360m2/ kg; Active oxidationMagnesium specific area is 300m2/ kg; Lime is chemical pure calcium hydroxide; Mineral admixture is that the mixing of flyash, slag is mixedClose material, weight ratio respectively accounts for 50%, and specific area is 350m2/ kg; Thickness is gathered materials and is selected according to existing concrete specification;Water is local salt lake bittern.
Slag, activated magnesia, lime, flyash, slag, aggregate are fully mixed to Xiang Qi by above-mentioned weight proportionIn add bittern, stir and obtain concrete materials, use carbon fibre reinforced plastic (CFRP) muscle as concreteMuscle material, then carries out follow-up construction according to existing known concentraing pond concrete construction technology, does not need concrete surfacePreservative treatment. Curing age is 28 days, and curing temperature is 20 ± 2 DEG C, and the air humidity of maintenance environment is 99%.
Embodiment 2:
The on-the-spot ground of certain saline soil area factory building is processed and is adopted plain concrete bored concrete pile, designing pile length 12m, and stake footpath 500cm,Groundwater depth 4m. Learn that according to engineering investigation report this saline soil area salt content is 5.2%, the content of leading ion is:Ca2+：0.7%，Mg2+：0.5%，K+/Na+：1.1%，SO4 2-：2.1%，Cl-：0.6%，HCO3 -/CO3 2-：0.2%。The salinity of subsurface brine is: 63.7g/L. According to the salinity of salinized soil saliferous kind and salt content, subsurface brine, pressThe weight portion of following raw material is prepared corrosion resistant concrete:
Slag: 500 parts; Activated magnesia powder: 120 parts; Mineral admixture: 150 parts; Coarse aggregate: 1200 parts; CarefullyGather materials: 700 parts; Water: 300 parts. Wherein, slag specific area is 300m2/kg; Activated magnesia specific area is300m2/kg; Mineral admixture is the mixing admixture of phosphorus slag, slag, silicon ash, weight ratio accounts for respectively 30%, 30%,40%, specific area is respectively 300m2/kg、300m2/kg、20000m2/ kg; Thickness is gathered materials according to existing concrete specificationSelect; Water is local common fresh water.
Slag, activated magnesia, phosphorus slag, slag, silicon ash, aggregate are fully mixed by above-mentioned weight proportion, whereinAdd water, stir and obtain concrete materials, carry out follow-up construction by existing known concrete bored pile piling technology,Cast in situs pile. Curing age is 14 days, and curing temperature is 22 DEG C, and the air humidity of maintenance environment is 96%.
Embodiment 3:
The moistureproof wave resistance in certain harbour is carried, and adopts cast in situs armored concrete dykes and dams mode to construct, and dykes and dams are soaked in seawater throughout the yearThe middle degree of depth is 6-8m, is: 31.88g/L, leading ion according to the salinity of the known seawater herein of the examining report of seawaterSalinity is (g/L): K+And Na+：15.32，Ca2+：0.41，Mg2+：0.33，Cl-：12.67，SO4 2-：0.81，CO3 2-：0.13. According to the salinity of above-mentioned seawater leading ion, prepare corrosion resistant concrete according to the weight portion of following raw material:
Slag: 650 parts; Activated magnesia powder: 180 parts; Lime: 150 parts; Mineral admixture: 50 parts; Coarse aggregate:750 parts; Fine aggregate: 600 parts; Water: 120 parts. Wherein, slag specific area is 350m2/ kg; Activated magnesia ratioSurface area is 300m2/ kg; Lime is quick lime, and specific area is 200m2/ kg; Mineral admixture is calcining coal gangue powder,Specific area is 300m2/ kg; Thickness is gathered materials and is selected according to existing concrete specification; Water is for getting seawater nearby.
Slag, activated magnesia, lime, calcining coal gangue powder, aggregate are fully mixed to Xiang Qi by above-mentioned weight proportionIn add seawater, stir and obtain concrete materials, use through resinous coat antiseptic reinforcing bar as concreteMuscle material, carry out follow-up construction by existing known dam concrete construction technology, without carrying out anticorrosion to concrete surfaceProcess. Curing age is 30 days, and curing temperature is 20 DEG C.
Embodiment 4:
Adopt corrosion resistant concrete of the present invention to make concrete precast pipe pile for certain chlorine saline soil area, the long 5m of stake,External diameter 0.5m, wall thickness 0.1m. Learn that according to engineering investigation report the salt content of this area's salinized soil is 15.6%, mainly fromThe content of son is: Ca2+：1.6%，Mg2+：1.4%，K+/Na+：5.2%，SO4 2-：2.5%，Cl-：4.3%，HCO3 -/CO3 2-：0.6%. Weight portion according to following raw material is prepared corrosion resistant concrete:
Slag: 300 parts; Activated magnesia powder: 100 parts; Mineral admixture: 100 parts; Coarse aggregate: 300 parts; CarefullyGather materials: 300 parts; Water: 150 parts. Wherein, slag specific area is 400m2/ kg; Activated magnesia specific area is300m2/ kg; Mineral admixture is slag, and specific area is respectively 350m2/ kg; Thickness is gathered materials according to existing concrete ruleModel is selected; Water is for making common fresh water.
Its fabrication processing is as follows:
(1) slag, activated magnesia, lime, calcining coal gangue powder, aggregate are fully mixed by above-mentioned weight proportion, toWherein add water, stir and obtain concrete materials;
(2) to putting into fiberglass reinforced plastics muscles and bones frame in assembled good punching block, and colligation is in mould, and backwardIn punching block, pour into mixed concrete material, adopt centrifugal forming mode to carry out material forming;
(3) after concrete materials moulding, put into curing kilns and carry out maintenance, 20 DEG C of curing temperatures, air humidity is 95%,Stripping forming after maintenance 7d.

Claims (7)

1. for a corrosion resistant concrete for salt marsh environment, it is characterized in that: containing Na+、K+、Ca2+、Mg2+、Cl-、SO4 2-、CO3 2-In in the salt marsh environment of several salt ions, by between the each component of described concrete and with salt marsh environment in salinityInteract, ensure concrete setting and harden, Emergence and Development the long-term intensity that keeps in salt marsh environment; Described salting hoopingBorder is: 1. salinized soil is that saliferous quality percentage composition is the salinized soil of 1%-30%, water content 20%～150%; 2. salinityFor the bittern environment of 10g/L-500g/L, in bittern, leading ion salinity scope is: K+And Na+：4.5g/L～240g/L，Ca2+：0.5g/L～65g/L，Mg2+：0.5g/L～50.5g/L，Cl-：4.5g/L～180g/L，SO4 2-：2.5g/L～150.5g/L，CO3 2-: 0.3g/L～45g/L; Described concrete is prepared from by the raw material of following component by weight: slag: 100～800Part; Activated magnesia powder: 40～300 parts; Lime: 0～300 part; Mineral admixture: 50～400 parts; Coarse aggregate: 200～1600Part; Fine aggregate: 100～900 parts; Water: 100～400 parts.
2. a kind of corrosion resistant concrete for salt marsh environment according to claim 1, is characterized in that: described slag ratioSurface area is not less than 250m2/Kg; Described activated magnesia powder specific area is not less than 300m2/ kg; Described lime isQuick lime, white lime or both compositions; Described mineral admixture be the flyash that meets particle diameter requirement, silicon ash, slag,A kind of mineral admixture or several mineral admixture in red mud mine tailing, non-ferrous metal slag, calcining coal gangue powder mix,The specific area of described flyash is not less than 400m2/ kg, the specific area of silicon ash is not less than 15000m2/ kg, slag with haveThe specific area of non-ferrous metal slag is not less than 350m2/ kg, the specific area of red mud mine tailing is not less than 300m2/ kg, calcining coalThe specific area of spoil powder is not less than 300m2/ kg; Described coarse aggregate, fine aggregate are selected according to existing concrete specification; DescribedWater be the bittern of gathering materials on the spot in fresh water or job site.
3. a kind of corrosion resistant concrete for salt marsh environment according to claim 1, is characterized in that: described concrete rootAccording to designing requirement prepare reinforced-concrete prefabricated components, the cast-in-place structures of reinforced-concrete or member, plain concrete is cast-in-place constructsThing or member, plain concrete prefabricated components.
4. a kind of corrosion resistant concrete for salt marsh environment according to claim 3, is characterized in that: described reinforcement is mixedThe muscle material that solidifying native prefabricated components or the cast-in-place structures of reinforced-concrete or member adopt is process antiseptic reinforcing bar, colouredMetal ribs material, FRP muscle material, string muscle material.
5. a kind of corrosion resistant concrete for salt marsh environment according to claim 4, is characterized in that: described process is anti-The rotten reinforcing bar of processing is stainless steel, resinous coat reinforcing bar, corrosion-inhibiting coating reinforcing bar; Non-ferrous metal muscle material is aluminium alloy muscle material; FRPMuscle material is fiberglass reinforced plastics muscle, Carbon Fiber Reinforced Plastic, aromatic polyamide fiber reinforced plastics muscle; String muscle material isBamboo reinforcement, bamboo silk rope, reed muscle.
6. a kind of corrosion resistant concrete for salt marsh environment according to claim 1, it is made and construction technology is: to executingSalinity kind, concentration and the ratio of building site district salt marsh environment are measured, according to the saliferous kind of concrete salt marsh environment of living inAnd salt content is determined the concrete proportioning of corrosion resistant concrete; Determine after each component proportion, by slag, activated magnesia powder, stoneAsh, mineral admixture, coarse aggregate, fine aggregate fully mix according to proportioning, then add water wherein, stir and are mixedSolidifying local product material, then constructs and maintenance by existing known concrete construction process.
7. a kind of corrosion resistant concrete for salt marsh environment according to claim 6, is characterized in that: use described resistance toWhen corrosion concrete is made prefabricated components, curing age is 7～28 days, and curing temperature is 20 ± 2 DEG C, air humidity >=95%.
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CN103319145A (en) * 2013-05-30 2013-09-25 北京航空航天大学 Corrosion-resistant concrete for high-chlorine bittern environment and its preparation and construction methods

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