基于响应曲面法的纳米颗粒增强水泥浆体制备研究

基于响应曲面法,考虑纳米颗粒掺量、减水剂掺量、水胶比三个关键影响因素,以水泥硬化浆体抗压强度为响应,利用中心复合设计法设计试验,建立纳米SiO₂、纳米CaCO₃、纳米Al₂O₃增强水泥浆体的强度模型,并以纳米CaCO₃增强水泥浆体强度模型为例,分析各因素对强度的影响规律,对强度模型进行验证。结果表明,当纳米颗粒与水泥质量比为0.027 0、减水剂与水泥质量比为0.017 5、水胶比为0.25时,三种纳米颗粒增强水泥浆体具有较高强度。纳米SiO₂、CaCO₃、Al₂O₃增强水泥浆体的强度模型具有较高的精度和可靠性。纳米CaCO₃增强水泥浆体的抗压强度响应值随着纳米颗粒掺量、减水剂掺量的增大先增大后减小,随着水胶比的增大逐渐减小。

Preparation of Nano-Particles Reinforced Cement Paste Based on Response Surface Method

Based on the response surface method, considering the three key influencing factors of nano-particles content (NPC), polycarboxylates superplasticizer content (PSC), and water-binder ratio (WBR), the response was based on the compressive strength of hardened cement paste. Using the central composite design method to design experiments, the strength models of nano-SiO₂, nano-CaCO₃, and nano-Al₂O₃ reinforced cement paste were established. The nano-CaCO₃ reinforced cement paste strength model was taked as an example to analyze the influences of various factors on the strength and verify the strength model. The results show that when the mass ratio of nano-particle to cement is 0.027 0, the mass ratio of polycarboxylates superplasticizer to cement is 0.017 5, and water-binder ratio is 0.25, the three nano-particles reinforced cement pastes have higher strength. The strength models of nano-SiO₂, nano-CaCO₃, nano-Al₂O₃ reinforced cement paste have high accuracy and reliability. The compressive strength response value of nano-CaCO₃ reinforced cement paste first increases and then decreases with the increase of NPC and PSC, and gradually decreases with the increase of WBR.