High-Fluidization, Early Strength Cement Grouting Material Enhanced by Nano-SiO2: Formula and Mechanisms

Abstract

Cement grouting material is one of the most important materials in civil construction at present, for seepage prevention, rapid repair, and reinforcement. To achieve the ever-increasing functional requirements of civil infrastructures, cement grouting materials must have the specific performance of high fluidization, early strength, and low shrinkage. In recent years, nanomaterials have been widely used to improve the engineering performance of cement grouting materials. However, the mechanisms of nanomaterials in grouting materials are not clear. Hence, a high-fluidization, early strength cement grouting material, enhanced by nano-SiO2, is developed via the orthogonal experimental method in this study. The mechanisms of nano-SiO2 on the microstructure and hydration products of the HCGA, in the case of different curing ages and nano-SiO2 contents, are analyzed through scanning electron microscopy tests, X-ray diffraction tests, differential scanning calorimetry tests, and Fourier transform infrared spectroscopy tests.

Coagulation Mechanism and Compressive Strength Characteristics Analysis of High-Strength Alkali-Activated Slag Grouting Material

“…The compressive strength of specimen L-1 (100% PC, Figure 1 a) reached 5.4 MPa (1 d) and further increased to 11.2 MPa (3 d). The early compressive strength of specimen L-1 (1 d and 3 d) was clearly insufficient, and the early strength developed slowly, severely affecting the early reinforcement effect of PC grouting materials [ 28 ]. Although the compressive strength further increased to 24.3 MPa when curing lasted for 28 d, this still could not compensate for the poor early reinforcement effect of PC grouting materials.…”

Uncertainty-Based Performance Prediction and Optimization of High-Fluidization Cement Grouting Material Using Machine Learning and Bayesian Inference

“…In other words, performance fluctuation will tend to appear in the formula containing the design factor with a low frequency. For instance, water-cement ratio and accelerating agent content are the critical factors for the early strength of the cement grouting material (Ren et al, 2021a(Ren et al, , 2021b. Compared with the O-1 and O-2 (see Table 9), the frequencies when the accelerating agent content and water-cement ratio are equal to 2.5% and 0.56 for the O-2 are higher than the frequencies when the accelerating agent content and water-cement ratio are equal to 2.0% and 0.53 for the O-1, respectively.…”

“…Table 6 presents the scheme generated by orthogonal experimental design. The fluidity, flexural and compression strength (1 day, 3 days, and 7 days), and shrinkage rate (7 days and 28 days) were tested to investigate (9) It should be explained that the analysis process of formula determination is complex in the orthogonal experimental method, which can be found in our previous study (Ren et al, 2021a(Ren et al, , 2021b and not described in this paper. The formula determined by the orthogonal experimental method is listed in Table 8.…”

“…It is inevitable to affect the performance of the grouting material. As a result, a frequent case is that there is performance fluctuation of the grouting material, although the raw materials, formula, experimental conditions, and operating personnel are all the same, which will bring unknown risk in engineering application (Ren et al, 2021a(Ren et al, , 2021b(Ren et al, , 2022bZhao, 2022;Zhao et al, 2021aZhao et al, , 2021bZhao et al, , 2021c. The performance fluctuation results from the uncertainty mentioned above during material design (Ren et al, 2020).…”

Use of Alkali-Activated Slag as an Environment-Friendly Agent for High-Performance Stabilized Soil

“…The rapid development of infrastructure construction creates an ever-increasing demand for river sand, gravel stone, cement and other engineering materials, resulting in the depletion of natural resources and causing serious threats to the eco-system [ 1 , 2 , 3 ]. To alleviate the environmental burden and realize the sustainable development of society, the utilization of resource-saving and environment-friendly engineering materials is required [ 4 , 5 , 6 ].…”