التفاصيل البيبلوغرافية
| العنوان: |
Effect of the structure of polycarboxylate superplasticizer on property of early strength. (English) |
| المؤلفون: |
PANG Jianjun, CHEN Yafei, TANG Jianshu, XU Meiqing, WANG Jingyao |
| المصدر: |
New Building Materials / Xinxing Jianzhu Cailiao; 2021, Issue 11, p108-111, 4p |
| مستخلص: |
Twelve polycarboxylate superplasticizers were synthesized by adjusting the length of side chain, the mole ratio of acid-ether, the amount of chain transfer agent and the functional monomer. The effects on early strength, water-reducing rate and hydration heat were discussed. It was found that, the early strength of concrete increased with the increase of side chain length and the decrease of acid-ether mole ratio and the introduction of cationic monomer. When the side chain length was n=90, the acidether mole ratio was 3.5, the functional monomer was DAC, and the amount of chain transfer agent was 3.5%, 90PC3.5-DAC1 has the best ability on early-strength. Compared with SIKA-Z, the compressive strength ratio of concrete at 20 h and 24 h are 109% and 114% respectively. Polycarboxylate superplasticizer can delay cement hydration and the delay intensifies with the increase of the dosage. At the same dosage, the delayed hydration ability of 90PC3.5-DAC1 was significantly weaker than that of 54PC4.5, 90PC3.5-DAC1 can make the normal hydration of cement, produce higher early strength. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
Complementary Index |
