黄原胶对普通硅酸盐水泥性能的影响及机理研究  

Influence of Xanthan Gum Retarder on the Properties of Ordinary Portland Cement

作　　者：陈宇珊 李玉婷 刘来宝[1] 张红平[1] 

机构地区：[1]西南科技大学,四川绵阳621010

出　　处：《混凝土世界》2023年第1期60-64,共5页China Concrete

摘　　要：大多数缓凝剂的调节作用随环境温度升高而下降,严重影响了固井工程、地热工程等高温作业的施工进程和安全性。现有耐高温缓凝剂多为合成高分子型,成本高、易造成污染,不符合当代“双碳”目标的发展需求。本文研究了一种普通硅酸盐水泥用天然耐高温缓凝剂—黄原胶,通过凝结时间、流动度、力学性能、X-射线衍射、流变等表征方法,研究了在20~80℃温度范围内黄原胶的粘度变化及其对水泥浆和易性和力学性能的影响。结果表明:黄原胶具有稳定的溶液表观粘度和分子结构,使其在高温下具有稳定的缓凝和增稠效果。此外,黄原胶丰富的极性官能团可通过螯合Ca2+来延缓水泥水化进程,这种延迟效应几乎不会造成强度损失。黄原胶对开发用于各种特殊环境下的水泥基复合材料具有重要意义。The regulating effect of most retarders decreases with the increase of ambient temperature,which seriously affects the construction process and safety of high-temperature operations such as cementing engineering and geothermal engineering.At the same time,mostof retarders for high-temperature environment are synthetic polymer,which are expensive and easy to cause pollution,disagree with the development of contemporary"two-carbon"goals.In this study,a natural retarder for ordinary Portland cement(OPC),xanthan gum,was reported.Through the characterization of setting time,fluidity,mechanical properties,X-ray diffraction,and rheology,it was studied the viscosity change of xanthan gum in the temperature range of 20-80℃and its effect on workability and mechanical properties of cement paste.The results show that the stable solution apparent viscosity and molecular structure of xanthan gum leading to the stable retardation and thickening effect at high temperature of OPC.In addition,the cement hydration process delayed by chelating Ca2+via the abundant polar functional groups of xanthan gum without strength damage.Xanthan gum is of great significance to the development of cement-based composite materials for various special environments.

关 键 词：黄原胶 普通硅酸盐水泥 高温缓凝剂 增稠剂 

分 类 号：TU528[建筑科学—建筑技术科学]