Cellulose nanofibril (CNF) with a high aspect ratio, elastic modulus, tensile strength, and reactive surface area is a promising nanomaterial for improving the chemo-mechanical properties of cementitious matrixes. CNFs are typically less than 0.2 mm in length and 50 nm in width, and are extracted from plants and trees. This study investigated the potential application of three types of CNF for enhancing the performance of ordinary Portland cement (OPC) pastes: pure CNF (PCNF), silica coated CNF (SCNF), and lignin-containing CNF (LCNF). The performance of the cement pastes was monitored for cement paste workability, hydration kinetics, microstructural development, and mechanical performance (compressive strength and flexural strength). The dispersion stability of CNFs measured through zeta potential showed a better dispersion for SCNF when compared with PCNF and LCNF in varied alkaline mediums. The better stability of SCNF also resulted in improved workability of the cement paste mixtures containing this type of cellulose. All of the cellulose nanomaterials accelerated the cement hydration at the early stage as a result of the nucleation effect. Such an acceleration effect was slightly higher for SCNF because of the presence of silica nanoparticles. The addition of 0.1% SCNF increased the compressive strength (90 days) by 13% when compared with the control batch and 10% compared with the PCNF batch. The addition of 0.1% of PCNF enhanced the flexural strength by 70% followed by LCNF with 40% improvement. SCNF showed little to no effect on the flexural strength.

具有高纵横比，弹性模量，拉伸强度和反应性表面积的纤维素纳米原纤维是用于改善水泥基体化学机械性能的有前途的纳米材料。CNF通常长度小于0.2毫米，宽度小于50纳米，是从植物和树木中提取的。这项研究调查了三种类型的CNF在增强普通硅酸盐水泥（OPC）浆料性能方面的潜在应用：纯CNF（PCNF），二氧化硅涂层CNF（SCNF）和含木质素的CNF（LCNF）。监测水泥浆的性能，以检查水泥浆的可加工性，水合动力学，微观结构发展和机械性能（抗压强度和抗弯强度）。与PCNF和LCNF在各种碱性介质中相比，通过zeta电位测量的CNF的分散稳定性表现出更好的SCNF分散性。SCNF更好的稳定性还导致含有这种纤维素的水泥浆混合物的可加工性得到改善。由于成核作用，所有纤维素纳米材料都在早期促进了水泥的水合作用。由于存在二氧化硅纳米粒子，因此对于SCNF的这种加速效果略高。与对照组相比，添加0.1％SCNF可使抗压强度（90天）提高13％，与PCNF相比提高10％。添加0.1％的PCNF可使弯曲强度提高70％，其次是LCNF，可提高40％。SCNF对弯曲强度几乎没有影响。