聚羧酸酯减水剂接枝氧化石墨烯对水泥砂浆性能的研究

doi:10.19964/j.issn.1006-4990.2024-0484

摘要/Abstract

摘要：

利用聚羧酸酯减水剂（PCE）接枝改性氧化石墨烯（GO），合成了一种新型GO基减水剂（PCE@GO），GO改性实验简便易行。接枝改性后的PCE@GO不仅可以克服GO在水泥砂浆中的团聚问题，还可以将PCE@GO作为增强材料，提升水泥砂浆的力学性能。结果表明，PCE@GO在水泥溶液中可以均匀分散，其分散稳定性得到明显改善，这是因为GO表面接枝的PCE提供的空间位阻效应和静电排斥作用阻碍了GO的团聚。此外，PCE@GO还可以显著提高水泥浆体的力学性能：掺入质量分数为0.1%的PCE@GO时，水泥复合材料28 d时的抗折强度和抗压强度达到最大值8.0 MPa和65.4 MPa，分别比掺加0.1%的GO样品提高了6.7%和23.2%。掺加PCE@GO还提升了水泥砂浆的流动性，并降低了水合物的晶粒尺寸，改善了固化后复合材料的性能。该研究为设计制备高性能水泥材料提供了理论和实验依据，对促进GO基材料在水泥砂浆中的应用具有一定的指导意义。

关键词: 水泥砂浆, 氧化石墨烯, 聚羧酸酯减水剂, 力学性能

Abstract:

In this study，polycarboxylate superplasticizer（PCE） was used to graft onto graphene oxide（GO），thereby synthesizing a novel GO-based superplasticizer（PCE@GO）.The GO modification experiment was simple and feasible.It not only could overcome the agglomeration issue of GO in cement mortar but also enhanced the mechanical properties of the cement mortar by using grafted PCE@GO as a reinforcing material.The experimental results showed that PCE@GO could be uniformly dispersed in the cement solution，with obviously improved stability，due to the steric hindrance and electrostatic repulsion provided by the PC on the surface of GO，which prevented the agglomeration of GO.Furthermore，PCE@GO also significantly enhanced the mechanical properties of the cement paste：when 0.1%（mass fraction） content of PCE@GO was added，the flexural strength and compressive strength of the cement composite material at 28 d reached the maximum values of 8.0 MPa and 65.4 MPa，respectively，which were 6.7% and 23.2% higher than the GO samples with an addition of 0.1% PCE@GO.The addition of PCE@GO also improved the flowability of the cement mortar and reduced the crystal size of the hydration products，thereby enhancing the performance of the cured composite material.This study provided theory and experimental basis for designing and preparing high performance cement mortar materials，and had certain guiding significance for the application of GO-based materials in cement mortar.

Key words: cement mortars, graphene oxide, polycarboxylate superplasticizer, mechanical property

中图分类号:

TQ127.12

张玉. 聚羧酸酯减水剂接枝氧化石墨烯对水泥砂浆性能的研究[J]. 无机盐工业, 2025, 57(9): 46-52.

ZHANG Yu. Study on effect of polycarboxylate superplasticizer grafted with graphene oxide on properties of cement mortar[J]. Inorganic Chemicals Industry, 2025, 57(9): 46-52.

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