Cement paste is generally used as a grouting joint material for concrete structures. A good rheology property guarantees the workability of fresh cement paste, and an excellent fracture toughness that reflects the good crack resistance of hardened cement paste. Calcium carbonate whisker (CW) is an inorganic mineral reinforcing material with excellent micromechanical performance, microcrack resistance and environmentally friendly nature. In this study, the rheological and three‐point bending tests were conducted on CW reinforced cement paste (CWRCP) to evaluate workability and mechanical properties. The results showed that the yield stress (τ₀) and plastic viscosity (μ) were increased with addition of CW. This was because of the large specific surface area of CW which consumed free water and reduced lubricity between cement particles; and meanwhile, fibrous CW overlapped into net and prevented the flow of fresh cement paste. The addition of CW increased the fracture toughness (K_IC) of cement paste due to its microscopic crack resistance effect. Also, the environmental scanning electron microscopy (ESEM) analysis was performed to study the microstructural characteristics. The response surface methodology (RSM) was used to evaluate the influence of CW content (v_cw) and water–cement ratio (w/c) to response parameters. Additionally, multiobjective optimization technique was performed to determine best settings for design variables which satisfied ideal response parameters. Conclusively, the optimal solution of CWRCP is beneficial to acquire ideal response goal and provides the basis for engineering applications.

中文翻译：

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使用响应面法优化碳酸钙晶须增强水泥浆的流变性和断裂性能

水泥浆通常用作混凝土结构的灌浆接缝材料。良好的流变性保证了新鲜水泥浆的可加工性，并且优异的断裂韧性反映了硬化水泥浆的良好抗裂性。碳酸钙晶须（CW）是一种无机矿物增强材料，具有出色的微机械性能，抗微裂纹性和环保特性。在这项研究中，对CW增强水泥浆（CWRCP）进行了流变和三点弯曲测试，以评估其可加工性和机械性能。结果表明，屈服应力（τ ₀）和塑性粘度（μ）随着CW的增加而增加。这是因为连续水的比表面积大，它消耗了游离水并降低了水泥颗粒之间的润滑性。同时，纤维状的连续波重叠成网，阻止了新鲜水泥浆的流动。CW的添加由于其微观的抗裂效果而增加了水泥浆的断裂韧性（K _IC）。此外，进行了环境扫描电子显微镜（ESEM）分析以研究其微观结构特征。响应面法（RSM）用于评估_连续水含量（v _cw）和水灰比（w / c）响应参数。另外，执行多目标优化技术来确定满足理想响应参数的设计变量的最佳设置。总之，CWRCP的最佳解决方案有助于获得理想的响应目标，并为工程应用提供基础。