Potential Effect of Surface Modified Nano‐SiO2 with PDDA on the Cement Paste Early Hydration,ChemistrySelect

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Potential Effect of Surface Modified Nano‐SiO2 with PDDA on the Cement Paste Early Hydration
ChemistrySelect ( IF 1.9 ) Pub Date : 2020-03-17 , DOI: 10.1002/slct.201904791
Chunlong Huang ₁ , Yiren Wang ₁ , Jihui Zhao _{1,

2} , Dongmin Wang ₃

Affiliation

The potential application of surface modified nano‐SiO₂ (NS) particles with poly (dimethyl diallyl ammonium chloride) (PDDA) has been reported in other fields, but not in civil construction. This paper aims to assess the influence of surface modified NS with PDDA on the early‐age hydration of cement paste, where cement is replaced by 0.3%, 1% and 3% of NS particle. PDDA can be introduced onto the surface of NS via long‐distance charge pairs. Calorimetric measurements of cement pastes with 0.35 w/b (water/binder) ratio show that NS particles accelerate the cement hydration, while PDDA retards it. Moreover, the cement hydration is controlled by PDDA at lower dosage of NS/PDDA particle, which delays the exothermic peaks of cement hydration, while the cement hydration is controlled by NS particle aggregates at higher dosage of NS/PDDA particle. Based on the results above, the mechanism of the adsorption of NS/PDDA particle on cement particle surfaces is proposed.

中文翻译：

PDDA表面改性的纳米SiO2对水泥浆早期水化的潜在影响

表面改性的纳米SiO ₂的潜在应用在其他领域，但未在民用建筑领域中报道过带有聚二甲基二烯丙基氯化铵（PDDA）的（NS）颗粒。本文旨在评估用PDDA表面改性的NS对水泥浆早期水化的影响，其中水泥被0.3％，1％和3％的NS颗粒代替。PDDA可以通过长距离电荷对引入到NS表面。比例为0.35 w / b（水/粘合剂）的水泥浆的量热法测量表明，NS颗粒加速了水泥的水合作用，而PDDA则阻碍了水泥的水合作用。此外，在较低剂量的NS / PDDA颗粒下，水泥水化由PDDA控制，这延迟了水泥水化的放热峰，而在较高剂量的NS / PDDA颗粒下，水泥水化由NS颗粒聚集体控制。根据以上结果，

更新日期：2020-03-19

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