水利水电技术2018，Vol.49Issue(1)：149-155,7.DOI:10.13928/j.cnki.wrahe.2018.01.022
湿喷混凝土回弹率影响因素的研究进展
Advance of study on factors of influences on rebound rate of wet shotcrete
摘要
Abstract
In order to sort out the main dominant factors of the rebound rate of wet shotcrete and improve the economy of shotcreting supporting technique,the influences of all the relevant factors on the rebound rate are reviewed in three aspects,i.e.raw materials,mixture proportions,construction technology of the concrete.So far as the raw materials are concerned,the dispersity of the concrete during its shot-transmission process can be lowered,while its rebound rate can be decrease as well by means of adding admixtures and fibres,increasing the finenesses of admixtures and decreasing the maximum particle size of the aggregate.From the view point of the mixture proportions,the adhesive efficiency of the shotcrete can be enhanced,while its rebound rate can be decrease as well by means of increasing the proportion of cementing material,enhancing the concrete consistence and setting up appropriate slump and setting time.From the aspect of construction technology,the rebound rate can be significantly decreased by means of appropriately increasing the build-up shotcreting thickness,taking right-angle as the shotcreting angle and controlling the reasonable working air-pressure.At present,most of the relevant studies are made on a single factor,thus the coupling effects among all the factors concerned are neglected.Therefore,the study on the relevant theory of the coupling effect must be strengthened for establishing the internal relationships among all the factors and intensifying the dynamic regulation mechanism concerned in the days to come.关键词
湿喷混凝土/回弹率/原材料/配合比/施工工艺Key words
wet shotcrete/rebound rate/raw materials/mixture proportions/construction technology分类
建筑与水利引用本文复制引用
宁逢伟,丁建彤,白银,张丰,雷英强..湿喷混凝土回弹率影响因素的研究进展[J].水利水电技术,2018,49(1):149-155,7.基金项目
国家重点研发计划项目(2016YFC0401610) （2016YFC0401610）
国家自然科学基金项目(51739008) （51739008）
江苏省自然科学基金项目(BK20151072) （BK20151072）
中国水利水电第七工程局有限公司项目(2015-458-20) （2015-458-20）
