16
DOI:10. 7672/sgjs2014050016
施工技术
CONSTRUCTION TECHNOLOGY
2014年3月上第43卷第5期
石膏和聚丙烯纤维对超早强灌浆料性能影响研究
张晓平1，孙长征",2赵同峰1,3，陈谦1
（1.沈阳建筑大学土木工程学院，辽宁沈阳110168；2.沈阳建筑大学建筑设计研究院，辽宁沈阳110015；
3.辽宁省交通高等专科学校道路与桥梁工程系，辽宁沈阳110122）
[摘要]介绍了石膏、聚内烯纤维对超早强灌浆料流动度、终凝时间、抗压和抗折强度等性能指标的影响。结果表明：石膏的掺入可以改善超早强灌浆料的力学强度性能，在石膏掺量为5%时，超早强灌浆料的水化速度较快，硬化浆体微膨胀，结构致密，力学强度等综合指标最好；聚丙烯纤维掺量在0.1%以内时，其力学强度和抗裂性随其掺量的增加而提高，掺量>0.15%时，力学强度开始降低。聚丙烯纤维长度在9mm以内，其抗折强度与纤维长度呈
正相关；长度超过12mm，增强效果略有下降。【关键词］灌浆料；石膏；聚丙烯纤维；超早强
［中图分类号】TU528.53;TQ177.6
【文献标识码］A
[文章编号】1002-8498(2014)05-0016-05
StudyontheEffectofGypsumandPolypropyleneFiberonthe
Performance ofSuperEarlyStrengthGroutingMaterial ZhangXiaoping,SunChangzheng2,ZhaoTongfeng3,ChenQian
( 1. School of Civil Engineering,Shenyang Jianzhu Uninersity,Shenyang,Liaoning110168, China;
2. Architectural Design & Research Institute, Shenyang Jianzhu Unieersity, Shenyang,Liaoning110015, China :
3. Department of Road and Bridge, Liaoning Prorincial College of Communications, Shenyang,Liaoning110122, China) Abstract: This paper introduced the effect of gypsum and polypropylene fiber on fluidity, final setting time, compressive strength and flexural strength and other performance indicators of super early strength grouting materials. The results showed that gypsum could improve the mechanical strength properties of super early strength grouting materials. When gypsum content was 5% , hydration speed of super early strength grouting materials was faster, the expansion properties of hardened paste was micro-expansion, the structure was compact, and the comprehensive index of mechanical strength was the best. When polypropylene fiber content was within O. 1%, with the increase of the dosage, the mechanical strength aseoaae to decrease.When polypropylene fiber length was within 9mm, the flexural strength and the fiber length were positively correlated, however when the length was more than 12mm, the enhancement effect decreased slightly
Key words : grouting material; gypsum; polypropylene fiber; super early strength
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引言
随着社会的进步，外加剂产业的迅猛发展，人
们对建筑环境的需求也提出更高要求，高强灌浆料也取得较大发展。高强灌浆料具有较好的流态，在自身重力作用下，流入建筑物或结构的孔洞空隙中，然后发生水化凝固，堵塞空隙，达到饱满填充的
*“十二五"国家科技支撑计划课题（2012BAJ11B02）；“十二五"国家科技支撑计划课题（2011BAJ10B04）
[作者简介］张晓平，颈士研究生，E-mail：zhangping45220@163.com【收稿日期］2013-11-28
效果其广泛应用于结构加固与补强、工程抢险、注浆堵漏、缺陷修复、古建筑物复原加固、抢建工程、设备安装和楼板灌浆等。因此，超早强高强灌浆技术的研发引起科研人员的极大关注，尤其抗裂性能和微膨胀性的研究。对于微膨胀性，刘成健等1进行了硬石膏掺量对快硬性修补砂浆的研究，提出以高强硫铝酸盐水泥为主的快硬性修补砂浆，最佳石膏掺量为3%~5%，以高铁硫铝酸盐水泥为主的快硬型修补砂浆，最佳掺量为3%~8%；李英丁等[2] 进行了硬石膏与高铝水泥掺量对无收缩灌浆料性