基于波干涉技术的早龄混凝土强度及刚度监测方法研究  

Research on the Strength and Stiffness Monitoring Method of Early-age Concrete Based on Wave Interference Technique

作　　者：彭晓川 PENG Xiaochuan(Sichuan Transportation Construction Group Co.,Ltd.,Chengdu 610047,China)

机构地区：[1]四川省交通建设集团有限责任公司,成都610047

出　　处：《交通科技》2024年第5期111-116,共6页Transportation Science & Technology

摘　　要：精准监测早龄期混凝土的强度和刚度,对于装配式建筑的施工和应用至关重要。文中提出一种无损技术,用于监测早龄期混凝土强度和刚度的发展过程。首先在混凝土试样浇注后进行水或空气养护,之后通过超声波技术获取早龄期混凝土中波的相对速度变化,分析动态弹性模量和抗压强度随养护龄期的变化影响。结果表明,混凝土养护龄期对相对速度影响较大,养护28 d后,水养护和空气养护试样的相对速度变化分别逐渐增加到9.0%和5.3%;双峰测试技术和伸缩测试技术2种固化方法的相对速度变化值相似,窗宽几乎不会影响相对速度变化的估算;固化28 d时,水固化试样的抗压强度比空气固化试样高19.7%,动态弹性模量比空气固化试样高13.5%,水固化试样的相对速度变化高出约3.9%,波干涉测量技术能够有效区分2种固化方法的影响;相对抗压强度和相对弹性模量均与相对速度变化间存在较强线性相关性。Accurate monitoring of the strength and stiffness of early-age concrete is indispensable for the construction and application of assembled buildings.A non-destructive technique was presented to monitor the evolution of strength and stiffness in early-age concrete.Initially,concrete specimens were cured in water or air following casting.Subsequently,ultrasonic techniques were employed to measure the relative velocity changes of waves in early-age concrete,enabling the analysis of dynamic modulus of elasticity and compressive strength variations over the curing period.The results indicate that the age of concrete curing has a significant impact on the relative velocity.After 28 days of curing,the relative velocity changes for water-cured and air-cured samples increased to 9.0%and 5.3%,respectively.Additionally,the relative velocity changes between bimodal and telescopic curing methods were comparable,with window width minimally affecting estimates.Furthermore,after 28 days of curing,water-cured samples exhibited a 19.7%higher compressive strength,a 13.5%higher dynamic modulus of elasticity,and a relative velocity change approximately 3.9%higher than air-cured samples.The wave interferometry technique effectively differentiated between the effects of the two curing methods,showing a strong linear correlation between relative compressive strength,relative modulus of elasticity,and relative velocity change.

关 键 词：无损检测 波干涉测量 早龄期混凝土 

分 类 号：U445.57[建筑科学—桥梁与隧道工程]