CN112279601A - Ultrahigh-performance concrete for rapid repair and preparation method thereof - Google Patents
Ultrahigh-performance concrete for rapid repair and preparation method thereof Download PDFInfo
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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
- C04B28/02—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 hydraulic cements other than calcium sulfates
- C04B28/06—Aluminous cements
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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
- C04B2111/72—Repairing or restoring existing buildings or building materials
Abstract
The invention relates to an ultra-high performance concrete for quick repair and a preparation method thereof, wherein the ultra-high performance concrete comprises the following raw materials in parts by weight: expansive high belite sulphoaluminate cement: 800-900 parts; metakaolin: 100-180 parts; grade I fly ash: 120-200 parts; water reducing agent: 15-20 parts of a solvent; quartz sand: 1000 and 1100 parts; water: 180-200 parts; steel fiber: 140 portions to 160 portions. The ultra-high performance concrete has high early strength, greatly shortens the construction period and can realize the reuse of the structure within about 2 hours; the 2h compressive strength can reach more than 40MPa, the 1d compressive strength can reach more than 120MPa, and the structure with high strength requirement can be repaired; the concrete has the advantages of high bonding strength, small shrinkage, 7d self-contraction value less than 290ppm, good adaptability with old concrete, good volume stability, suitability for quick repair of projects with open time requirements and wider application.
Description
Technical Field
The invention belongs to the technical field of concrete, and particularly relates to ultrahigh-performance concrete for quick repair and a preparation method thereof.
Background
With the rapid development of the Chinese economic construction and the social requirements, the traditional infrastructure construction of China also makes a rapid progress, and the concrete plays a vital role in the construction of roads, bridges, houses and other structures as one of the most widely applied building materials. Although the concrete material has high durability, for forty years, due to factors such as improper construction, overload use, improper operation, freeze-thaw cycle, natural disasters and the like, a large number of concrete projects have problems such as cracks, surface peeling and the like. Therefore, the research on reliable rapid repair materials has important significance on the safety and the durability of concrete structures.
The ideal quick repairing material has the technical characteristics of easy construction, quick hardening, early strength and good durability, and the bonding property and the shrinkage property of the repairing material are also important because the new and old concrete interfaces are weak after the structure is in service. The stronger the cohesiveness of the repairing material is, the more stable the combination of the new material and the old material is; the old concrete has no shrinkage, and the larger the shrinkage of the repair material is, the more easily cracks are formed at the interface under shear stress and tensile stress, so that secondary damage is caused. At present, the repairing materials aiming at the concrete structure mainly comprise common cement concrete (mortar), polymer concrete (mortar) and special cement series concrete (mortar), but the three repairing materials are still lack of meeting the structural requirements of high standards. Chinese patent publication No. CN110041033A discloses a pavement quick repair material made of ordinary portland cement with addition agents such as calcium formate, triisopropanolamine, and polyvinyl alcohol, which has high bonding strength but low later mechanical strength, and is not good for long-term service of engineering. Chinese patent publication No. CN105884253A discloses a polymer mortar for quick repair, which is prepared by using natural color sand as a main raw material, modified bisphenol A epoxy resin as a cementing material, compound modified aliphatic amine as a curing agent, inorganic nanoparticles as a toughening filler and a proper amount of active diluent, epoxy resin defoamer, anti-aging agent and the like according to a proportion, but the formula has high large-scale application cost, slow coagulation and low early strength. Chinese patent publication No. CN105130314A discloses a rapid repair modified cement slurry of sulphoaluminate cement with addition of an expanding agent, an early strength agent and a thickening agent, wherein the early strength of the rapid repair modified cement slurry is greatly improved, but the later strength of the rapid repair modified cement slurry is likely to be inverted and shrunk, and the adaptability problem of an additive and special cement exists.
Disclosure of Invention
The invention provides an ultra-high performance concrete for rapid repair and a preparation method thereof, aiming at solving the problems in the prior art. The ultrahigh-performance concrete takes self-made expansive high belite sulphoaluminate cement, metakaolin and fly ash as cementing materials, no external agents such as an early strength agent and an expanding agent are added, and the cementing materials can show the characteristics of good cohesiveness, high early strength, stable increase of later strength, low shrinkage and even micro expansion after being subjected to hydration and hardening.
The invention is realized in such a way that the ultra-high performance concrete for quick repair is composed of the following raw materials in parts by weight: expansive high belite sulphoaluminate cement: 800-900 parts; metakaolin: 100-180 parts; grade I fly ash: 120-200 parts; water reducing agent: 15-20 parts of a solvent; quartz sand: 1000 and 1100 parts; water: 180-200 parts; steel fiber: 140 portions to 160 portions.
In the above technical solution, the composition preferably comprises the following raw materials in parts by weight: expansive high belite sulphoaluminate cement: 800-900 parts; metakaolin: 150 and 160 parts; grade I fly ash: 150-180 parts; water reducing agent: 16-18 parts; quartz sand: 1030- > 1080 parts; water: 185 portion and 195 portions; steel fiber: 145-155 portions.
In the above technical solution, preferably, the fineness of the metakaolin is 1250 meshes.
In the above technical solution, preferably, the water demand ratio of the class I fly ash is not more than 90%, and the specific surface area is 450-500m2/kg。
In the above technical scheme, preferably, the water reducing agent is a polycarboxylic acid high-efficiency water reducing agent, and the water reducing rate is more than 30%.
In the above technical scheme, preferably, the quartz sand is water-washed drying sand with the maximum particle size of less than or equal to 1.5 mm.
In the above technical solution, preferably, the steel fiber is a copper-plated steel fiber, and the copper-plated steel fiber has a length of 10mm to 15mm and a diameter of 0.15mm to 0.2 mm.
In the above technical scheme, preferably, the expansive high belite sulphoaluminate cement is prepared by adding a certain amount of anhydrite into expansive high belite sulphoaluminate cement clinker and grinding the mixture until the specific surface area is 400-500 m2The addition amount of the anhydrite accounts for 5 to 10 weight percent of the expansive high belite sulphoaluminate cement.
In the above aspect, it is further preferable that the expansibilityThe high belite sulphoaluminate cement clinker has the following batching parameters: the alkalinity coefficient Cm is 1.4-1.6, fCaO is 5-8%, fSO37-10%; the expansive high belite sulphoaluminate cement clinker has the following mineral composition in percentage by weight: c2The content of S mineral is 40-50%,
mineral content of 25-35%, C12A7Mineral content of 4-5%, CaSO4Mineral content of 10-15%, fCaO mineral content of 4-8%, C4The content of AF mineral is 1-2%.
The preparation method of the ultrahigh-performance concrete for quick repair comprises the following steps:
1) weighing expansive high belite sulphoaluminate cement, metakaolin, I-grade fly ash, a water reducing agent, quartz sand, water and steel fiber according to the formula amount;
2) pouring the weighed high-expansibility belite sulphoaluminate cement, metakaolin, I-grade fly ash and quartz sand into a planetary mortar stirrer to be uniformly stirred for 2-5 minutes;
3) mixing the water reducing agent into water, fully dissolving and uniformly mixing the water reducing agent and the water, and then pouring the mixture into the mixture obtained in the step 2) to continue stirring for 2-3 minutes;
4) pouring copper-plated steel fibers into the mixture obtained in the step 3), and continuously stirring for 2-3 minutes to obtain the quick-repairing ultrahigh-performance concrete.
The invention uses self-developed expansive high belite sulphoaluminate cement to completely replace Portland cement in the traditional ultra-high performance concrete, and is characterized in that: 1) the cement has the advantages of common sulphoaluminate cement, and is quick to set and high in early strength; 2) the bonding property is strong, so that the bonding between the repairing material and the old concrete is more stable; 3) the cement has certain shallow-burned free calcium, and meanwhile, the sulphoaluminate mineral and the gypsum are combined to generate ettringite under the action of water, so that the volume is slightly expanded, and the shrinkage is reduced; 4) the belite mineral content is greatly improved compared with the common sulphoaluminate cement, and the stable increase of the later strength of the repaired ultrahigh-performance concrete material is guaranteed.
The metakaolin is used for replacing silica fume in the traditional ultra-high performance concrete, the metakaolin is an amorphous compound in a metastable state, the reaction activity is even higher than that of the silica fume, on one hand, the metakaolin can remarkably improve the early strength of the concrete by self hydration, on the other hand, the hydration of cement can be accelerated by consuming calcium hydroxide by hydration, the early strength can also be improved, the metakaolin can also reduce the shrinkage of the concrete, and the durability of the concrete is improved, which is particularly important for repairing materials. The metakaolin and the expansive high belite sulphoaluminate cement are used together, so that the early strength of the ultrahigh-performance concrete material for repairing can be further improved, and an early strength agent is not required to be used.
The invention has the advantages and positive effects that:
1) the ultrahigh-performance concrete is quick in setting and controllable in time, and the setting time for quickly repairing the ultrahigh-performance concrete can be controlled by adjusting the proportion of the high belite sulphoaluminate cement, the dosage of the water reducing agent and the dosage of water in the cementing material.
2) The ultra-high performance concrete adopts a high belite sulphoaluminate cement and metakaolin system, has high early strength, greatly shortens the construction period, can realize the reuse of the structure about 2 hours, has the 2h compressive strength of more than 40MPa and the 1d compressive strength of more than 120MPa, can repair the structure with high strength requirement, is particularly suitable for the emergency repair of bridge expansion joints, road surfaces and beam bodies of highway engineering with the requirement of opening time, the leakage of tunnel engineering and the rapid repair of airport runway engineering, and has wider application.
3) The ultra-high performance concrete of the invention does not need to be added with early strength agent, polymer, expanding agent and the like, has low cost and simple construction, and is convenient for large-scale production.
4) The ultra-high performance concrete has high bonding strength, good adaptability with old concrete, small shrinkage, 7d self-shrinkage value less than 290ppm, good volume stability and no secondary repair due to shrinkage cracks.
5) The ultra-high performance concrete has excellent impermeability and durability, and ensures long-term service performance.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention relates to an ultrahigh-performance concrete for quick repair, which is prepared from the following raw materials in parts by weight: expansive high belite sulphoaluminate cement: 800-900 parts; metakaolin: 100-180 parts; grade I fly ash: 120-200 parts; water reducing agent: 15-20 parts of a solvent; quartz sand: 1000 and 1100 parts; water: 180-200 parts; steel fiber: 140 portions to 160 portions.
Wherein the fineness of the metakaolin is 1250 meshes.
The water demand ratio of the class I fly ash is not more than 90 percent, and the specific surface area is 450-500m2/kg。
The water reducing agent is a polycarboxylic acid high-efficiency water reducing agent, and the water reducing rate is more than 30%.
The quartz sand is water-washed drying sand with the maximum grain diameter less than or equal to 1.5 mm.
The steel fiber is copper-plated steel fiber, the length of the copper-plated steel fiber is 10mm-15mm, and the diameter of the copper-plated steel fiber is 0.15mm-0.2 mm.
The expansive high belite sulphoaluminate cement is prepared by adding a certain amount of anhydrite into expansive high belite sulphoaluminate cement clinker and grinding the mixture until the specific surface area is 400-500 m2The addition amount of the anhydrite accounts for 5 to 10 weight percent of the expansive high belite sulphoaluminate cement.
The high-expansibility belite sulphoaluminate cement clinker has the following batching parameters: the alkalinity coefficient Cm is 1.4-1.6, fCaO is 5-8%, fSO37-10%; the expansive high belite sulphoaluminate cement clinker has the following mineral composition in percentage by weight: c2The content of S mineral is 40-50%,
mineral content of 25-35%, C12A7Mineral substance4-5% of CaSO4Mineral content of 10-15%, fCaO mineral content of 4-8%, C4The content of AF mineral is 1-2%.
The preparation method of the ultrahigh-performance concrete for quick repair comprises the following steps:
1) weighing expansive high belite sulphoaluminate cement, metakaolin, I-grade fly ash, a water reducing agent, quartz sand, water and steel fiber according to the formula amount;
2) pouring the weighed high-expansibility belite sulphoaluminate cement, metakaolin, I-grade fly ash and quartz sand into a planetary mortar stirrer to be uniformly stirred for 2-5 minutes;
3) mixing the water reducing agent into water, fully dissolving and uniformly mixing the water reducing agent and the water, and then pouring the mixture into the mixture obtained in the step 2) to continue stirring for 2-3 minutes;
4) pouring copper-plated steel fibers into the mixture obtained in the step 3), and continuously stirring for 2-3 minutes to obtain the quick-repairing ultrahigh-performance concrete.
The present invention will be described in further detail with reference to specific examples below:
example 1:
weighing the following raw material components in parts by weight: 800g of expansive high belite sulphoaluminate cement; metakaolin: 100g of the total weight of the mixture; grade I fly ash: 120g of a mixture; water reducing agent: 15g of the total weight of the mixture; quartz sand: 1100 g; water: 190g of the total weight of the powder; copper-plated steel fiber: 150 g.
The preparation method comprises the following steps: pouring the expansive high belite sulphoaluminate cement, metakaolin, I-grade fly ash and quartz sand into a planetary mortar mixer, and stirring for 3 minutes to be uniform; mixing the water reducing agent into water, fully dissolving and uniformly mixing the water reducing agent and the water, and then pouring the mixture into the mixture to continue stirring for 3 minutes; and then pouring copper-plated steel fiber and continuously stirring for 2 minutes to obtain the rapid-repairing ultrahigh-performance concrete.
Example 2:
weighing the following raw material components in parts by weight: 850g of expansive high belite sulphoaluminate cement; metakaolin: 150g of the total weight of the mixture; grade I fly ash: 150g of the total weight of the mixture; water reducing agent: 17g of a basic amine; quartz sand: 1050g of the total weight of the mixture; water: 200g of the total weight of the mixture; copper-plated steel fiber: 145 g.
The preparation method comprises the following steps: pouring the expansive high belite sulphoaluminate cement, metakaolin, I-grade fly ash and quartz sand into a planetary mortar mixer, and stirring for 2 minutes to be uniform; and (3) mixing the water reducing agent into water, fully dissolving and uniformly mixing the water reducing agent, pouring the mixture into the mixture, continuously stirring the mixture for 2 minutes, pouring the copper-plated steel fibers into the mixture, and continuously stirring the mixture for 3 minutes to obtain the quick-repairing ultrahigh-performance concrete.
Example 3:
weighing the following raw material components in parts by weight: 850g of expansive high belite sulphoaluminate cement; metakaolin: 120g of a mixture; grade I fly ash: 200g of the total weight of the mixture; water reducing agent: 18g of a mixture; quartz sand: 1080 g; water: 185g of benzene; copper-plated steel fiber: 155 g.
The preparation method comprises the following steps: pouring the expansive high belite sulphoaluminate cement, metakaolin, I-grade fly ash and quartz sand into a planetary mortar mixer, and stirring for 4 minutes to be uniform; and (3) mixing the water reducing agent into water, fully dissolving and uniformly mixing the water reducing agent, pouring the mixture into the mixture, continuously stirring the mixture for 3 minutes, pouring the copper-plated steel fibers into the mixture, and continuously stirring the mixture for 2 minutes to obtain the quick-repairing ultrahigh-performance concrete.
Example 4:
weighing the following raw material components in parts by weight: 900g of expansive high belite sulphoaluminate cement; metakaolin: 100g of the total weight of the mixture; grade I fly ash: 150g of the total weight of the mixture; water reducing agent: 16g of a mixture; quartz sand: 1000 g; water: 195 g; copper-plated steel fiber: 140 g.
The preparation method comprises the following steps: pouring the expansive high belite sulphoaluminate cement, metakaolin, I-grade fly ash and quartz sand into a planetary mortar mixer, and stirring for 2 minutes to be uniform; and (3) mixing the water reducing agent into water, fully dissolving and uniformly mixing the water reducing agent, pouring the mixture into the mixture, continuously stirring the mixture for 2 minutes, pouring the copper-plated steel fibers into the mixture, and continuously stirring the mixture for 2 minutes to obtain the quick-repairing ultrahigh-performance concrete.
Example 5:
weighing the following raw material components in parts by weight: 900g of expansive high belite sulphoaluminate cement; metakaolin: 160g of a mixture; grade I fly ash: 180 g; water reducing agent: 20g of the total weight of the mixture; quartz sand: 1030 g; water: 180 g; steel fiber: 160 g.
The preparation method comprises the following steps: pouring the expansive high belite sulphoaluminate cement, metakaolin, I-grade fly ash and quartz sand into a planetary mortar mixer, and stirring for 4 minutes to be uniform; and (3) mixing the water reducing agent into water, fully dissolving and uniformly mixing the water reducing agent, pouring the mixture into the mixture, continuously stirring the mixture for 3 minutes, pouring the copper-plated steel fibers into the mixture, and continuously stirring the mixture for 3 minutes to obtain the quick-repairing ultrahigh-performance concrete.
Comparative example 1:
weighing the following raw material components in parts by weight: 800g of magnesium phosphate cement; fly ash: 200g of the total weight of the mixture; ultra-fine fly ash: 200g of the total weight of the mixture; quartz sand: 1200g of the total weight of the powder; water reducing agent: 18g of a mixture; water: 180 g; steel fiber: 155 g.
The preparation method comprises the following steps: pouring magnesium phosphate cement, fly ash, ultrafine fly ash and quartz sand into a planetary mortar mixer, and stirring for 3 minutes to be uniform; and (3) mixing the water reducing agent into water, fully dissolving and uniformly mixing the water reducing agent, pouring the mixture into the mixture, continuously stirring the mixture for 3 minutes, pouring the copper-plated steel fibers into the mixture, and continuously stirring the mixture for 3 minutes to obtain the concrete.
Comparative example 2:
weighing the following raw material components in parts by weight: 900g of ordinary portland cement; fly ash: 150g of the total weight of the mixture; silica fume: 150g of the total weight of the mixture; water reducing agent: 16g of a mixture; quartz sand: 1200g of the total weight of the powder; water: 180 g; steel fiber: 162 g.
The preparation method comprises the following steps: pouring ordinary portland cement, fly ash, mineral powder and quartz sand into a planetary mortar mixer, and stirring for 4 minutes to be uniform; and (3) mixing the water reducing agent into water, fully dissolving and uniformly mixing the water reducing agent, pouring the mixture into the mixture, continuously stirring the mixture for 2 minutes, pouring the copper-plated steel fibers into the mixture, and continuously stirring the mixture for 3 minutes to obtain the concrete.
The self-contraction value of the quick-repair ultrahigh-performance concrete is tested by a corrugated pipe method (corrugated pipe method) according to the ASTM C1698 standard; the compressive strength and the flexural strength were tested according to the standard GB17671-1999 method for testing the strength of cement mortar, the test block being a prism of 40mm x 160 mm. The properties of the quick-repair ultra-high performance concrete of examples 1 to 5 and comparative examples 1 to 2 were measured, and the results are shown in table 1 below:
TABLE 1 physical Properties of the quick repair ultra high Performance concrete of the examples
As can be seen from table 1 above, compared with the products in the prior art (comparative examples 1-2), the ultra-high performance concrete for rapid repair provided by the invention has significant high strength and low shrinkage performance, the 2h compressive strength is greater than 40MPa, the flexural strength is greater than 15MPa, the 1d compressive strength is greater than 120MPa, and can reach more than 80% of the 28d compressive strength, and meet the mechanical properties required by most structures, thereby realizing rapid repair function, and stably increasing the 28d compressive strength; the 7d self-shrinkage value is less than 290ppm, and the concrete has remarkable low shrinkage performance and strong adaptability with the old concrete structure.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: it is to be understood that modifications may be made to the technical solutions described in the foregoing embodiments, or some or all of the technical features may be equivalently replaced, and the modifications or the replacements may not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. An ultra-high performance concrete for rapid repair, characterized in that: the composition is characterized by comprising the following raw materials in parts by weight: expansive high belite sulphoaluminate cement: 800-900 parts; metakaolin: 100-180 parts; grade I fly ash: 120-200 parts; water reducing agent: 15-20 parts of a solvent; quartz sand: 1000 and 1100 parts; water: 180-200 parts; steel fiber: 140 portions to 160 portions.
2. The ultra-high performance concrete for rapid repair according to claim 1, wherein: the composition is characterized by comprising the following raw materials in parts by weight: expansive high belite sulphoaluminate cement: 800-900 parts; metakaolin: 150 and 160 parts; grade I fly ash: 150-180 parts; water reducing agent: 16-18 parts; quartz sand: 1030- > 1080 parts; water: 185 portion and 195 portions; steel fiber: 145-155 portions.
3. The ultra-high performance concrete for rapid repair according to claim 1, wherein the metakaolin has a fineness of 1250 mesh.
4. The ultra-high performance concrete for rapid repair as claimed in claim 1, wherein the water demand ratio of the class I fly ash is not more than 90%, and the specific surface area is 450-500m2/kg。
5. The ultra-high performance concrete for rapid repair according to claim 1, wherein the water reducing agent is a polycarboxylic acid high efficiency water reducing agent, and the water reducing rate is more than 30%.
6. The ultra-high performance concrete for rapid repair according to claim 1, wherein the quartz sand is water-washed and dried sand having a maximum particle size of 1.5mm or less.
7. The ultra high performance concrete for rapid repair according to claim 1, wherein the steel fiber is copper-plated steel fiber having a length of 10mm to 15mm and a diameter of 0.15mm to 0.2 mm.
8. The ultra-high performance concrete for rapid repair as claimed in claim 1, wherein the expansive high belite sulphoaluminate cement is prepared by grinding expansive high belite sulphoaluminate cement clinker with an amount of anhydrite added thereto until the specific surface area is 400-500 m2The addition amount of the anhydrite accounts for 5 to 10 weight percent of the expansive high belite sulphoaluminate cement.
9. The quick repair system of claim 8The supplementary ultra-high performance concrete comprises the following ingredients: the alkalinity coefficient Cm is 1.4-1.6, fCaO is 5-8%, fSO37-10%; the expansive high belite sulphoaluminate cement clinker has the following mineral composition in percentage by weight: c2The content of S mineral is 40-50%,
mineral content of 25-35%, C12A7Mineral content of 4-5%, CaSO4Mineral content of 10-15%, fCaO mineral content of 4-8%, C4The content of AF mineral is 1-2%.
10. A method for preparing the ultra high performance concrete for rapid repair according to claim 1, comprising the steps of:
1) weighing expansive high belite sulphoaluminate cement, metakaolin, I-grade fly ash, a water reducing agent, quartz sand, water and steel fiber according to the formula amount;
2) pouring the weighed high-expansibility belite sulphoaluminate cement, metakaolin, I-grade fly ash and quartz sand into a planetary mortar stirrer to be uniformly stirred for 2-5 minutes;
3) mixing the water reducing agent into water, fully dissolving and uniformly mixing the water reducing agent and the water, and then pouring the mixture into the mixture obtained in the step 2) to continue stirring for 2-3 minutes;
4) pouring copper-plated steel fibers into the mixture obtained in the step 3), and continuously stirring for 2-3 minutes to obtain the quick-repairing ultrahigh-performance concrete.
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| CN115572131A (en) * | 2022-10-17 | 2023-01-06 | 大连海事大学 | Nano metakaolin modified cement mortar interface agent and preparation method and application thereof |
| CN115572126A (en) * | 2022-10-08 | 2023-01-06 | 新特新材料集团(河南)股份有限公司 | Ultra-early-strength UHPC premix for rush repair of airport runway |
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