碳化作用下混凝土抗压强度与回弹强度的关系  

Study on the Relationship Between Compressive Strength and Rebound Strength of Concrete under Carbonation

作　　者：罗婷婷 刘君 胡香 

机构地区：[1]贵州黔贵工程技术服务咨询有限公司,贵州毕节553102

出　　处：《混凝土世界》2024年第8期44-47,共4页China Concrete

摘　　要：在工程实践中,常以回弹强度表征实体建筑的抗压强度。然而,在长期的监测过程中,碳化作用可能改变混凝土的表面硬度,需要对抗压强度和回弹强度之间的换算进行修正。为明确碳化作用对混凝土抗压强度与回弹关系的影响规律,本文研究了不同矿物掺合料、骨料孔隙率和水胶比条件下混凝土回弹强度与芯样抗压强度之间的关系。结果表明:受表面碳化影响,混凝土的抗压强度通常高于表面回弹强度,其中,单掺矿物掺合料时,混凝土的回弹强度能较好地代表实际抗压强度;双掺矿物掺合料时,芯样的抗压强度远高于混凝土的回弹强度;在较高的砂石孔隙率下,混凝土的回弹强度显著低于芯样抗压强度;混凝土的回弹强度与芯样抗压强度随着水胶比的增大逐渐减小,两者之间的差值也逐渐缩小。The rebound strength is often used to characterise the compressive strength of solid buildings in engineering,but the conversion between compressive strength and rebound strength needs to be corrected due to the carbonation effect that may change the surface hardness of concrete during longterm monitoring.In order to clarify the inf luence of carbonation on the relationship between compressive strength and rebound of concrete,this article investigates the relationship between concrete rebound strength and core compressive strength under different mineral admixtures,aggregate porosity,and water-binder ratio conditions.The results show that the compressive strength of concrete is generally higher than the surface rebound strength due to the inf luence of surface carbonation.Among them,when adding mineral admixtures alone,the rebound strength of concrete can better represent the actual compressive strength of the core sample;when using dual admixtures,the compressive strength of the core sample is much higher than the rebound strength of the concrete;at higher sand and gravel porosity,the rebound strength of concrete is significantly lower than the compressive strength of the core sample;the rebound strength of concrete and the compressive strength of core samples gradually decrease with the increase of water-binder ratio,and the difference between the two also gradually narrows.

关 键 词：混凝土 碳化 抗压强度 回弹强度 水胶比 

分 类 号：TU528[建筑科学—建筑技术科学]