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Pore structure of hardened cement paste containing colloidal polymers with varied glass transition temperature and surface charges

机译：含有各种玻璃化转变温度和表面电荷的胶体聚合物的硬化水泥浆料的孔隙结构

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摘要

Influences of four polymer latexes with varied glass-transition-temperature (T-g) and colloidal surface properties on pore structure of hardened cement pastes (hcps) were investigated by means of mercury intrusion porosimetry (MIP), nitrogen adsorption measurement (NAM) and SEM. MIP measurement indicates that polymer addition leads to increase of total pore volume and threshold pore size, whereas NAM shows that pore volume in the range of 2-100 nm decreases with addition of polymers, implying a sealing effect. The conflicting results between MIP and NAM originate from destruction and movement of the polymer phase by high pressure mercury intrusion during MIP measurement. SEM reveals that low-T-g polymers form continuous film while high-T-g polymers remain particle form in hcps. The film-forming polymers provide stronger sealing effect than the non film -forming polymers. Moreover, the non-adsorbing polymers exhibit stronger sealing effect than the adsorbing polymers due to their preferential locations in aqueous phase of fresh cement paste.
机译：通过汞侵入孔隙瘤（MIP），研究了四种聚合物胶乳与变化的玻璃化转变 - 温度（T-G）和胶体结构上的胶合水泥糊剂（HCPS）的孔隙结构上的影响，氮吸附测量（NAM）和SEM。 MIP测量表明，聚合物添加导致总孔隙体积和阈值孔径的增加，而Nam表示在2-100nm的范围内的孔体积随着聚合物而降低，这意味着密封效果。 MIP和NAM之间的冲突结果源于MIP测量期间高压汞侵入的聚合物相的破坏和运动。 SEM显示低T-G聚合物形成连续薄膜，而高T-G聚合物在HCP中保持颗粒形式。成膜聚合物提供比非膜型聚合物更强的密封效果。此外，由于新水泥浆料水相中的优先位置，非吸附聚合物表现出比吸附聚合物更强的密封效果。

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