C-S-H/PCE对钢渣水泥砂浆早期水化及力学性能的调控机制

高建安; 徐红森; 周明辉

doi:10.11988/ckyyb.20250281

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长江科学院院报 ›› 0 DOI: 10.11988/ckyyb.20250281

C-S-H/PCE对钢渣水泥砂浆早期水化及力学性能的调控机制

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The Regulation Mechanism of C-S-H / PCE on the Early Hydration and Mechanical Properties of Steel Slag Cement Mortar

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摘要

为解决钢渣因其活性较低而导致混凝土早期强度降低的问题。通过合成聚羧酸盐分散剂（PCE）改性C-S-H纳米复合材料（C-S-H/PCE），并对其结构进行表征，系统研究C-S-H/PCE对钢渣体系的协同作用机制，深入探究了不同掺量C-S-H/PCE对钢渣水泥砂浆早期基本性能的影响。结果表明：C-S-H/PCE显著加速了钢渣水泥砂浆的凝结过程，且随着C-S-H/PCE掺量的增加，砂浆的凝结时间呈现递减趋势；该复合材料还显著增强了浆体的抗压强度和细化了其孔隙结构，尤其对早期阶段（1 d龄期前）的影响更为显著；此外，C-S-H/PCE还能够促进水泥浆体的早期水化，提高浆体的早期水化程度。其不仅能够激发水泥生成更多的水化产物，加速整体水化进程，而且这一过程中水化产物的种类并未发生改变，确保了水泥性能的稳定性与可控性，为钢渣水泥砂浆的性能优化开辟了新的路径。

Abstract

[Objectives] With the rapid development of the iron and steel industry, steel slag as a by-product in the process of iron and steel smelting, its resource utilization has become an important topic of environmental protection and sustainable development, and the low activity of steel slag will lead to the decrease of early strength of concrete. C-S-H not only shortens or even eliminates the induction period through the homogeneous nucleation effect, but also provides excellent physical filling effect, and does not have a negative impact on the later strength. This feature makes it have broader application potential and prospects than traditional early strength agents. However, C-S-H is prone to agglomeration due to its small particle size and large specific surface area, which affects its acceleration effect.

[Methods] In this study, C-S-H / PCE materials were synthesized and the effects of different dosages of C-S-H / PCE on the setting time, compressive strength, pore structure and cement hydration of steel slag cement mortar were systematically discussed. The setting time of cement mortar was tested according to the standard consistency water consumption, setting time and stability test method of cement (GB / T 1346). According to the cement mortar strength test method (GB / T 17671 − 2021), the compressive strength of cement mortar at 6h, 8h, 12h, 18h, 1d, 3d, 7d and 28d was tested. The Autopore IV 9520 mercury porosimeter was used to test the porosity of cement mortar after curing for 1 d, 3 d and 7 d. The thermal stability of mortar at 3 d, 7 d and 28 d was analyzed by NETZSCHSTA 2500 thermogravimetric analyzer. The mineral composition of steel slag cement mortar with different contents of C-S-H / PCE was qualitatively studied by Shimadzu XRD-6100 X-ray diffractometer.

[Results] The adsorption of Ca2+ by C-S-H / PCE conforms to the Langmuir adsorption model. The results show that the adsorption of Ca2+ by C-S-H / PCE is monolayer adsorption, and the maximum adsorption capacity (Qmax) can reach 26.19 mg / g. Adding a certain amount of C-S-H / PCE to steel slag cement mortar can effectively accelerate its setting time. And the incorporation ratio of C-S-H / PCE is proportional to the reduction of the setting time of the mortar, that is, the higher the C-S-H content, the shorter the time required for the cement mortar to reach the initial setting and final setting state. The addition of C-S-H / PCE can improve the compressive strength of steel slag cement mortar, especially in the early stage (before 1 d). The more C-S-H / PCE content, the higher the early compressive strength of steel slag cement mortar, and with the increase of curing age, the compressive strength growth rate of cement mortar decreases. The addition of a certain amount of C-S-H / PCE can effectively improve the compactness of steel slag cement mortar and refine its pore structure. Especially in the early stage of mortar test block, the improvement effect of C-S-H / PCE on porosity is more significant. With the increase of C-S-H / PCE content, the number of macropores in cement mortar decreased significantly, while the number of gelled pores and mesopores increased correspondingly, which promoted the pore structure to evolve towards a denser and smaller direction.

[Conclusions] C-S-H / PCE can not only stimulate cement to produce more hydration products and accelerate the overall hydration process, but also the types of hydration products in this process have not changed, which ensures the stability and controllability of cement properties and opens up a new path for the performance optimization of steel slag cement mortar.This study aims to provide a solid theoretical basis and technical guidance for the scientific and rational use of steel slag in concrete, so as to promote the in-depth development and practical application of steel slag resource utilization.

导出引用

高建安, 徐红森, 周明辉. C-S-H/PCE对钢渣水泥砂浆早期水化及力学性能的调控机制[J]. 长江科学院院报. 0 https://doi.org/10.11988/ckyyb.20250281

GAO Jian-an, XU Hong-sen, ZHOU Ming-hui. The Regulation Mechanism of C-S-H / PCE on the Early Hydration and Mechanical Properties of Steel Slag Cement Mortar[J]. Journal of Changjiang River Scientific Research Institute. 0 https://doi.org/10.11988/ckyyb.20250281

中图分类号： TU528

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