Ternary mix design of grout material for structural repair using statistical tools

Shamsuddoha, Md.; Hüsken, Götz; Schmidt, Wolfram; Kühne, Hans‐Carsten; Baeßler, Matthias

doi:10.1016/j.conbuildmat.2018.08.156

Cited by 20 publications

(11 citation statements)

References 45 publications

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“…Compressive strength increases with increasing micro silica. This trend was also reported earlier [20,34]. The response surfaces suggest that strength decreases with increasing fly ash and metakaolin in general.…”

Section: Resultssupporting

confidence: 89%

“…The results show ranges of mass loss, shrinkage, compressive strength, and flexural strength to be 5.71 -8.67 %, 0.214 -0.328 %, 56.9 -100.5 MPa, and 2.18 to 5.81 MPa, respectively. A detailed study for such similar mixtures was already reported [20], where 28-day properties were investigated after curing at submerged condition. Compared to that study, all the mixtures have lower compressive strengths.…”

Section: Resultsmentioning

confidence: 99%

“…Similar selection can be carried out for any other set of given properties. It should be noted that previous study of such mixtures showed that fresh properties were positively affected by fly ash and negatively affected by metakaolin, where detailed selection process of the ingredients according to their effect on fresh and 28-day hardened properties [20]. This poses a contradictory requirement for fresh and 28-day properties against long term (365-day) properties.…”

Section: Optimizationmentioning

confidence: 98%

See 2 more Smart Citations

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

Shamsuddoha¹,

Hüsken

Schmidt

et al. 2019

RILEM Tech Lett

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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.

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Section: Resultssupporting

confidence: 89%

Section: Resultsmentioning

confidence: 99%

Section: Optimizationmentioning

confidence: 98%

See 1 more Smart Citation

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

Shamsuddoha¹,

Hüsken

Schmidt

et al. 2019

RILEM Tech Lett

Self Cite

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“…One of the especially important parameters is the ability of the material to be injected in very narrow spaces and cracks. This is achieved by using components with extra fine particles such as fly ash, metakaolin, microsilica and granulated blast furnace slag [50]. The main drawback of these kinds of materials, though, is their inability to fill in microcracks (smaller than 500 µm) [51], but their better compatibility with inorganic substrate means that they are generally more durable than polymeric materials used for repair.…”

Section: Different Approaches To (Self-)healing and Repair With Focus On Bacteria-based Solutionsmentioning

confidence: 99%

Comparison of Microbially Induced Healing Solutions for Crack Repairs of Cement-Based Infrastructure

et al. 2021

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Reinforced concrete crack repair and maintenance costs are around 84% to 125% higher than construction costs, which emphasises the need to increase the infrastructure service life. Prolongation of the designed service life of concrete structures can have significant economic and ecological benefits by minimising the maintenance actions and related increase of carbon and energy expenditure, making it more sustainable. Different mechanisms such as diffusion, permeation and capillary action are responsible for the transport of fluids inside the concrete, which can impact on the structure service life. This paper presents data on microbially induced repair and self-healing solutions for cementitious materials available in the contemporary literature and compares results of compressive strength test and capillary water absorption test, which are relevant to their sealing and mechanical characteristics. The results of the repair and self-healing solutions (relative to unassisted recovery processes) were “normalized.” Externally applied bacteria-based solutions can improve the compressive strength of cementitious materials from 13% to 27%. The internal solution based solely on bacterial suspension had 19% improvement efficacy. Results also show that “hybrid” solutions, based on both bio-based and non-bio-based components, whether externally or internally applied, have the potential for best repair results, synergistically combining their benefits.

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“…If not treated properly and quickly, cracks will expand further, eventually requiring costly repairs. Currently, resin mortar and epoxy are used to repair cracks, but they react with nitrogen oxides to create ozone, a highly toxic air pollutant which is harmful to humans and the environment [5]. Therefore, from the viewpoint of eco-friendliness and cost reduction, new cementitious materials for repairing structural cracks such as BICP, which is known as the Molecules 2021, 26, 2967 2 of 10 self-healing technique, have gained attention.…”

Section: Introductionmentioning

confidence: 99%

Characterization of a Novel CaCO3-Forming Alkali-Tolerant Rhodococcus erythreus S26 as a Filling Agent for Repairing Concrete Cracks

Choi

Park

et al. 2021

Molecules

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Biomineralization, a well-known natural phenomenon associated with various microbial species, is being studied to protect and strengthen building materials such as concrete. We characterized Rhodococcus erythreus S26, a novel urease-producing bacterium exhibiting CaCO3-forming activity, and investigated its ability in repairing concrete cracks for the development of environment-friendly sealants. Strain S26 grown in solid medium formed spherical and polygonal CaCO3 crystals. The S26 cells grown in a urea-containing liquid medium caused culture fluid alkalinization and increased CaCO3 levels, indicating that ureolysis was responsible for CaCO3 formation. Urease activity and CaCO3 formation increased with incubation time, reaching a maximum of 2054 U/min/mL and 3.83 g/L, respectively, at day four. The maximum CaCO3 formation was achieved when calcium lactate was used as the calcium source, followed by calcium gluconate. Although cell growth was observed after the induction period at pH 10.5, strain S26 could grow at a wide range of pH 4–10.5, showing its high alkali tolerance. FESEM showed rhombohedral crystals of 20–60 µm in size. EDX analysis indicated the presence of calcium, carbon, and oxygen in the crystals. XRD confirmed these crystals as CaCO3 containing calcite and vaterite. Furthermore, R. erythreus S26 successfully repaired the artificially induced large cracks of 0.4–0.6 mm width.

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Ternary mix design of grout material for structural repair using statistical tools

Cited by 20 publications

References 45 publications

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

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

Comparison of Microbially Induced Healing Solutions for Crack Repairs of Cement-Based Infrastructure

Characterization of a Novel CaCO3-Forming Alkali-Tolerant Rhodococcus erythreus S26 as a Filling Agent for Repairing Concrete Cracks

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