| CHINESE MATERIALS CONFERENCE — ECO-MATERIALS |
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| Effects of Polycarboxylate Superplasticizer with β-Cyclodextrin on Properties of High Belite Calcium Sulphoaluminate Cement |
| TANG Ruifeng, WANG Ziming, HE Huan, ZHANG Lin, CAI Yangyang, WANG Jie
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| School of Materials Science and Engineering, Beijing University of Technology, Beijing 100124 |
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Abstract High belite calcium sulphoaluminate cement (HBCSA) is a newly developed cementing material with broad application prospects for its excellent mechanical properties, high volume stability, good durability and anti efflorescence property. Howe-ver, it is difficult for common retarders to delay its rapid hydration effectively due to the rapid setting and hardening of HBCSA, which has become the bottleneck restricting the wide application of this kind of new cement. In order to control the setting time of HBCSA and extend its application scope, the retarding material suited for HBCSA was explored and discussed in this paper, and the mechanism of hydration hardening of HBCSA was revealed, as well as the effective control measures were put forward. It was found that the combination of polycarboxylate superplasticizer (PCE) and β-cyclodextrin(β-CD) had good retarding effect to HBCSA paste or mortar. The fluidity, setting time and strength of HBCSA mortar with the admixture were tested. Scanning electron microscope (SEM), X-ray diffraction (XRD) analyzer, total organic carbon (TOC) analyzer and hydration heat evolution of cement were carried out. The results showed that the adding of PCE and β-CD could slow down the crystallization rate of ettringite, the setting time of HBCSA cement paste was significantly prolonged, and the cement setting time was increased with the increment of retarder content. Adding PCE and β-CD had a positive effect on improving the fluidity of HBCSA and the strength of rubber in the middle and late stages.
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Published: 21 December 2018
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2018, Vol. 32 
