Long-term mechanical and shrinkage properties of cementitious grouts for structural repair

RILEM Technical Letters

article

Md Shamsuddoha¹  Götz Hüsken¹  Wolfram Schmidt¹  Hans-Carsten Kühne¹  Matthias Baeßler¹ 

[1] Bundesanstalt für Materialforschung und ‐prüfung (BAM)

关键词: Grout;    Long-term shrinkage;    Micro silica;    Fly ash;    Metakaolin;   

DOI  :  10.21809/rilemtechlett.2019.82

学科分类：社会科学、人文和艺术（综合）

来源: RILEM Publications SARL

【 摘 要 】

Grouts have numerous applications in construction industry such as joint sealing, structural repair, and connections in precast elements. They are particularly favoured in rehabilitation of structures due to penetrability and convenience of application. Grouts for repair applications typically require high-performance properties such as rapid strength development and superior shrinkage characteristics. Sometimes industrial by-products referred as supplementary cementitious materials (SCM) are used with neat cement due to their capabilities to provide binding properties at delayed stage. Micro silica, fly ash and metakaolin are such SCMs, those can modify and improve properties of cement products. This study aims at investigating long-term mass loss and linear shrinkage along with long-term compressive and flexural strength for grouts produced from ultrafine cement and SCMs. A series of mixtures were formulated to observe the effect of SCMs on these grout properties. Properties were determined after 365 days of curing at 23oC and 55% relative humidity. The effect of SCMs on the properties are characterised by statistical models. Response surfaces were constructed to quantify these properties in relation to SCMs replacement. The results suggested that shrinkage was reduced by metakaolin, while micro silica and fly ash had positive effects on compressive and flexural strength, respectively.

【 授权许可】

CC BY