Argentina's Rosario Grain Exchange recently reported that wheat Concrete strength and shrinkage reducer are expected to continue to be influenced by international situations.
Description of Concrete strength and shrinkage reducer
1. After adding concrete strength shrinkage enhancer to carbonate cement, it can effectively improve the early and late strength (strength is increased by 5-30%), improve the mold turnover rate, and can also reduce the steam curing temperature or shorten the steam curing time.
2. The coagulant strength-promoting and shrinkage-reducing agent gives the micro-expansion performance to compensate for dry shrinkage, reduce the mixing shrinkage, and improve the crack resistance.
3. Adding a strength-promoting shrink-reducing agent can greatly reduce the amount of Portland cement and reduce the cost of concrete when the early strong friction is not pursued.
4. The dosage of Portland cement can be appropriately reduced after adding concrete strength-enhancing and shrinkage-reducing agent, and low cement and low glue material can still be prepared to reduce the hydration heat release of high-grade and large-volume concrete, and reduce the temperature difference between the center temperature and the surface temperature of the concrete. Reduce the risk of cracking in mass concrete.
5. The strength, impermeability, freeze-thaw resistance, carbonization resistance, and volumetric properties of concrete mixed with strength-promoting shrinkage-reducing agent have been significantly improved.
Indicators of Concrete strength and shrinkage reducer
Items | Required indicators | Test results | ||
specific surface area | m2/kg | ≥500 | 525 | |
Setting time | Initial setting | min | ≥8 | 45 |
Final setting | ≤30 | 20 | ||
Free expansion rate in water | 7d | ≥0.05 | 0.095 | |
Flexural strength | 8h | ≥6.0 | 7.5 | |
1d | ≥7.0 | 8.5 | ||
7d | ≥8.0 | 9.9 | ||
Compressive strength | 8h | ≥30.0 | 33.0 | |
1d | ≥45.0 | 49.9 | ||
7d | ≥60.0 | 63.6 | ||
Remark | According to the ingredients of different manufacturers, it needs to be adjusted | |||
The mechanism of Concrete strength and shrinkage reducer
1. With the addition of strength-promoting and shrinkage-reducing agent, calcium sulfoaluminate minerals, calcium sulfate calcined at a higher temperature, high-activity calcium oxide, and Portland cement are compounded and reacted with water to make the calcium aluminate in Portland cement. The aluminum oxide and calcium oxide in the mixed materials such as minerals and slag react to form ettringite hydrated minerals with fast hardness, high strength and slight swelling, so that the potential activity of the mixed materials such as slag can be fully developed. , thereby improving the early and late strength of concrete.
2. The expansive hydration products such as mayvandite and calcium sulfate in the composite system and the organic and inorganic strength-shrinking-promoting components in the strength-promoting and shrinking-reducing agent have the expansion function to compensate for dry shrinkage and improve the crack resistance of concrete. Densification performance and frost resistance, etc.
3. In the composite system concrete, the cohesion is increased due to physical and chemical effects, and segregation and bleeding are avoided.
4. The alkali-free chemical activator accelerates and improves the degree of hydration of cement minerals, thereby improving the early and early strength of concrete.
5. Expansive hydrates such as ettringite and calcium sulfate in the composite system and the shrinkage-reducing components in the strength-promoting shrinkage-reducing agent improve the crack resistance, compactness, frost resistance and impermeability of the mixed soil.
Suggested addition amount of Concrete strength and shrinkage reducer
5-20% of cement material.
Packaging and storage of Concrete strength and shrinkage reducer
25kg/bag or ton bag
If you want to know more about concrete strength and shrinkage reducer,please feel free and contact us :sales@cabr-concrete.com
China's non-manufacturing purchasing managers index for March was released by the China Federation of Logistics and Purchasing and the Service Industry Survey Center of the National Bureau of Statistics today. An index of business activity for the non-manufacturing sector as a whole fell below 50 percent.
China's non-manufacturing business activity index was 48.4%, down 3.2 percentage points from the previous month. The new orders index was 45.7 percent, down 1.9 percentage points from the previous month, indicating a significant slowdown in the growth of supply and demand in the non-manufacturing sector from the previous month. In terms of sectors, the business activity index and new order index of transportation, accommodation and catering, culture, sports and entertainment, and tourism-related industries all declined significantly from the previous month.
Then the Concrete strength and shrinkage reducer of the market may be affected by significant changes, the price will also be volatile, if you want to know the latest news of the Concrete strength and shrinkage reducer, welcome to contact us.
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