Mechanism analysis of concrete strength prediction by maturity method

Journal Information

J. Hefei Univ. Tech. (Nat. Sci.), Feb.2024, Vol.47 No.2: 233-239

DOI: 10.3969/j.issn.1003-5060.2024.02.014

Authors

ZHANG Zhaoqiang $ ^{1,2} $, ZHAN Binggen $ ^{1,2} $, ZHAO Mingqiang $ ^{1,2} $

(1. School of Civil and Hydraulic Engineering, Hefei University of Technology, Hefei 230009, China; 2. Engineering Research Center of Low-carbon Technology and Equipment for Cement-based Materials of Ministry of Education, Hefei 230009, China)

Abstract and Keywords

Abstract: In order to analyze the correlation between maturity and strength at the micro level, the concrete strength prediction mechanism was studied from the aspect of the relationship between the maturity and the generation of hydration products, and the establishment of maturity rules was verified. X-ray diffraction (XRD) was used to analyze the composition of various phases in cement stone at different curing temperatures and ages, and the relative generation amount of each phase was determined through the integral intensity method. The experimental results show that the relative generation amount of calcium hydroxide increases with the increase of maturity value, while the relative generation amount of ettringite first increases and then decreases with the increase of maturity value, and is not affected by the temperature history experienced by the cement stone. The relative generation amount of hydrated calcium silicate has the same law as that of calcium hydroxide. When the maturity of cement stone is equal, the relative generation of calcium hydroxide and ettringite in cement stone is roughly equal under different temperature histories.

Keywords: maturity rule; ettringite; calcium hydroxide $ Ca(OH)_{2} $; integral intensity method

作者信息

张赵强 $ ^{1,2} $，詹炳根 $ ^{1,2} $，赵明强 $ ^{1,2} $

(1. 合肥工业大学土木与水利工程学院，安徽合肥 230009；2. 水泥基材料低碳技术与装备教育部工程研究中心，安徽合肥 230009)

摘要和关键词

摘要: 为了从微观层面分析成熟度与强度之间的相关性,文章从成熟度与水化产物生成量之间的关系研究混凝土强度预测机理,并对成熟度规则进行验证;采用X射线衍射(X-ray diffraction, XRD)分析不同养护温度下各龄期水泥石中各物相组成,并通过积分强度法确定各物相的相对生成量。实验结果表明:氢氧化钙的相对生成量随着成熟度值增大而增大,钙矾石的相对生成量随着成熟度值增大呈先增大而后减小的趋势,且不受水泥石所经历的温度历程影响,水化硅酸钙的相对生成量与氢氧化钙具有相同规律;成熟度相等时,不同温度历程下的水泥石中氢氧化钙、钙矾石的相对生成量大致相等。

关键词: 成熟度规则；钙矾石；氢氧化钙；积分强度法

Funding

中国能建重大科技专项资助项目（STDC2019-KJZX-01-04）

合肥工业大学学报(自然科学版)

Navigation