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Polyethers ultra early and strong type concrete superplasticizer

A super-early-strength type and superplasticizer technology, applied in the field of concrete admixtures, can solve problems such as poor storage stability, affecting application, and reducing strength

Active Publication Date: 2007-12-12
JIANGSU SOBUTE NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chloride accelerators are the earliest inorganic salt accelerators, which can improve the early strength of concrete, but seriously affect the later strength of concrete, and because they contain Cl - , it is easy to cause depassivation and corrosion of steel bars, and its application is restricted
Sulfate early strength agents are likely to lead to poor performance in the later stage, and "hoarfrost" is easy to precipitate on the surface of the concrete, which affects the appearance, and increases the alkali content in the concrete, which will accelerate the alkali-aggregate reaction
Although alcohol amine accelerators have little effect on the later performance of concrete and have no chloride ions, their addition is difficult to control, which can easily cause serious retardation of concrete and decrease in concrete strength, and its high price has affected its popularity in the concrete industry. Applications
U.S. Patent No. 4444593 has announced the composite type accelerator of sodium carbonate and ferric sulfate or the composition of the sodium carbonate and aluminum sulfate that Japanese patent JP6005050 announces, and its common feature is: after they are mixed into concrete, improve early strength (1 day Within) the strength at the same time, but the 28-day strength is reduced, so that the impermeability is reduced, which is not conducive to the improvement of durability
[0004] To sum up, it is unsatisfactory to use traditional inorganic salt or organic early strength agent to improve the early strength of concrete, and its dosage is high.
[0005] Reduced late strength of concrete
And the early strength effect of the new graft copolymer admixture is not completely satisfactory, especially the strength development in low temperature environment is slow
Moreover, when compounding traditional inorganic salts or organic early strength agents into high-efficiency superplasticizers, not only will stratification easily occur, storage stability will deteriorate, and the dispersion performance of superplasticizers will be reduced.

Method used

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  • Polyethers ultra early and strong type concrete superplasticizer
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application Embodiment 1

[0074] Onoda 525R.P.II cement is used, the sand is standard sand, the mix ratio is 450g of cement, 1350g of standard sand, and 170g of water. Listed in table 3 is the impact of copolymer on the setting time of cement slurry and mortar strength, as seen from table 3, polyether concrete superplasticizer of the present invention has promoted cement early hydration, has improved cement-based material Early mechanical properties. In contrast, short-chain polymers such as Comparative Example 3 have low early strength, and the strength without adding functional defoaming components is even lower.

[0075] table 3

[0076]

application Embodiment 2

[0078] Cement is Onoda 525R.P.II, sand is fineness modulus M x = 2.6 medium sand, the stones are crushed stones with a particle size of 5-20mm and continuous gradation. Concrete water reducing rate, air content, setting time test methods refer to the relevant provisions of GB8076-97 "Concrete Admixtures". Concrete compressive strength and flexural strength refer to the relevant provisions of GB / T50081-2002 "Standards for Test Methods of Mechanical Properties of Ordinary Concrete". Concrete drying shrinkage is carried out with reference to the relevant provisions of GBJ82-85 "Ordinary Concrete Long-Term Performance and Durability Test Method", the test results are shown in Table 4, the polyether concrete superplasticizer of the present invention has excellent dispersion performance, and can significantly Improve the early strength of concrete. According to the test results, the 3d compressive strength can be increased by 140-200% relative to the benchmark, and the 28d compress...

application Embodiment 3

[0082] According to the "Medium and Long-term Railway Network Plan" approved by the State Council, my country will build more than 12,000 kilometers of passenger dedicated lines. Due to the needs of construction, passenger dedicated lines have proposed a concrete prefabricated component with super early strength, which requires 16h concrete under normal temperature curing conditions. The strength reaches 48MPa (using special cement). . The proportion of concrete is cement: water: fine aggregate: coarse aggregate = 427: 135: 691: 1127. The test results are shown in Table 5. It can be seen from the data in the table that the polyether concrete superplasticizer of the present invention can significantly improve the early strength of concrete, the 16h compressive strength has reached about 40% of the 28d strength, and the 1d compressive strength can reach more than 60% of the 28d. Since the cement on the project site is specially supplied ultra-fine cement (the specific surface are...

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Abstract

The invention relates to a polyether early- strength super-plasticizing agent. The preparation method comprises following steps: (1) copolymerization of water- borne free radical: 5%- 15% monomer a, 82%- 92% monomer b, 2%- 8% monomer c, and 1%- 3% monomer d copolymerizes in water- borne medium, the total amount of said monomers is 100%; (2) neutralizing reaction: adding alkoxy organic amine e showed in general formula (6) and (7) into copolymer after polymerizing reaction for neutralization, moderating the copolymer pH to be between 6.0- 7.5. The invention is characterized in that: (1) the dispersing performance and strengthening effect are outstanding at very low amount, and the strengthening effect at normal temperature or lower temperature at early stage is excellent, and the effect at middle and later stage grows stably; (2) it can reduce the concrete contract, and the contract rate is less than 90% of that of standard concrete; (3) it barely contains no chloride ion and is helpful for concrete durability increase.

Description

technical field [0001] The invention relates to a super early strength polyether concrete superplasticizer, which can significantly improve the early strength of concrete without delaying the setting time of cement, and belongs to the technical field of concrete admixtures. Background technique [0002] Compared with traditional polycondensation-type admixtures such as naphthalene and melamine, graft copolymer admixtures have become a worldwide research focus and development focus due to their low dosage, good dispersion, and large degree of freedom in molecular structure. It is called the third generation superplasticizer. According to reports, Japanese graft copolymer admixtures have accounted for more than 80% of the total number of high-performance admixture products. Due to the rise of large-scale infrastructure such as nuclear power, water conservancy, bridges, and tunnels in China, especially the planning of the national railway passenger dedicated line network projec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/32C04B103/32
Inventor 缪昌文刘加平冉千平洪锦祥尚燕毛永琳沙建芳
Owner JIANGSU SOBUTE NEW MATERIALS
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