| 摘要: |
| 利用制盐卤水和石灰合成低（水化）碱性MgO粉体，再与秸杆、卤水复合制成秸杆胶凝复合材料，研究碱性环境对这种复合材料结构与性能的影响.结果表明：控制沉淀反应终点pH＜10.0，可保证MgO粉体具有较低的水化碱性；强碱性环境（pH＞12.0）对秸杆纤维有较强的侵蚀作用，对其复合材料的凝结和力学性能有较大的影响；低碱性（pH＜10.0）镁氯胶凝材料与秸杆纤维有良好的适应性；随着秸杆纤维掺量的增加，复合材料的孔隙率增加，抗折、抗压强度下降，尺寸较小、较大的秸杆纤维分别对复合材料抗折、抗压强度的影响较为明显. |
| 关键词: 秸杆纤维 卤水 镁氯胶凝材料 低碱性墙体材料 强度 |
| DOI：10.3969/j.issn.1007 9629.2013.05.011 |
| 分类号: |
| 基金项目:江苏省新型环保重点实验室开放课题（AE201116） |
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| Research on Straw/Brine Low Alkali Composite Wall Materials |
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WANG Lu ming
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Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province,Yancheng Institute of Technology, Yancheng 224051, China
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| Abstract: |
| The magnesium oxide powder with low(hydration) alkalinity was produced by the reaction of brine with lime, then the composite cementitious materials as wall structure was prepared by mixing the MgO powder with straw and brine. The effect of alkaline environment on the structure and properties of the straw composite cementitious material was investigated. The results show that by controlling precipitation reaction end point with the pH less than 10.0, the magnesium oxide powder thus produced will for sure have low hydration alkalinity. Strong alkaline environment(pH greater than 12.0) has strong erosion on straw fiber, so that it has adverse effect on the mechanical properties of composite materials.Low alkaline environment(pH less than 10.0) is very adaptable for straw fiber. With the increase of use level of straw fiber, the composite material porosity increases, and the flexural strength and compressive strength decrease. The straw fiber with smaller size has great effect on flexural strength, while the straw with larger size has great effect on compressive strength of the composite materials. |
| Key words: straw fiber brine magnesium chloride cement low alkaline wall material strength |
