An Investigation of Using Thermoset Polymer Type Liquid Additives to Improve Cement Grout Performances in Rock Bolting Applications

Komurlu, Eren

doi:10.1007/s40891-020-00236-9

Cited by 4 publications

(5 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Although it was reported that the polymer additive makes increases in the viscosity of cement grouts, 3.5% PMS additive was assessed not enough high to prevent the grouting applications by standard equipments used in a mine. On the other hand, 7% additive amount was found to need modified equipments for its systematic use and not practical for grouting in the study by Komurlu (Komurlu, 2020). In case of having a tolerable increase in the viscosity, an advantage to prevent the grout to flow down especially from the holes drilled at the roof can be supplied by the use of the polymer additive.…”

Section: Discussionmentioning

confidence: 99%

“…Since the main reason for the increase in the ductility is the improvement in the crack propagation resistivity, it is an estimated result to have an improvement against the repeated strains of thermal cycles with an increase in the ductility (Groeneveld et al 2018;Das et al, 2020;Komurlu, 2018). In a study carried out by Komurlu (2020), the same thermoset polymer additive with that used in this study was investigated to determine its effect on the ductility of the cement grouts and it was reported that the additive notably improves the ductility and the energy absorption capacities of the grout mixes.…”

Section: Discussionmentioning

confidence: 99%

“…The viscosity of the fresh cement grout mixes was found to increase with an increase in the amount of the polymer additive used in this study. In a work carried out by Komurlu (2020), various tests were performed to determine effect of 3.5% and 7.0% same modified silicone type thermoset additive on the workability of the cement grout mixes in detail. Although it was reported that the polymer additive makes increases in the viscosity of cement grouts, 3.5% PMS additive was assessed not enough high to prevent the grouting applications by standard equipments used in a mine.…”

Section: Discussionmentioning

confidence: 99%

See 2 more Smart Citations

A Resin Type Additive Use to Improve Load Bearing Capacities of Grouted Rock Bolts Exposed to Thermal Cycles

Komurlu

2023

Mühendislik Bilimleri Ve Tasarım Dergisi

Self Cite

View full text Add to dashboard Cite

A thermoset PMS (Polyvinyl modified silicone) type polymer additive effect on load bearing capacities of cement grouted rock bolt specimens exposed to thermal cycles was investigated with a series of experimental studies. The additive used in this study was in liquid phase while adding into the fresh cement mix and started to solidify by polymerization after being mixed well in the cement grout. The silicone based thermoset product was selected to use because of its ability of polymerization in contact with water. According to the results of this study, the load bearing capacity loss due to thermal cycles was found to be notably limited as a result of using the thermoset additive. Therefore, the additive tested in this study was assessed to improve resistivities of the cement grouted rock bolts against the thermal changes.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

A Resin Type Additive Use to Improve Load Bearing Capacities of Grouted Rock Bolts Exposed to Thermal Cycles

Komurlu

2023

Mühendislik Bilimleri Ve Tasarım Dergisi

Self Cite

View full text Add to dashboard Cite

show abstract

“…The plate fixing mechanisms vary reinforcement/support reactions of rock bolts. For improving the energy absorption capacity of the plate part, load bearing capacity and displacement limits should be improved together [26][27][28]. As the energy unit of Joule (J) is equal to N‧m, the are under load (N) and displacement (m) graphs can be used to calculate the energy absorption capacity.…”

Section: Introductionmentioning

confidence: 99%

Investigation of New Energy Absorbing Mechanisms Used to Fix Rock Bolt Plates

Komurlu

2023

Period. Polytech. Civil Eng.

View full text Add to dashboard Cite

In this study, different plate fixing designs were tested in order to improve rock bolting performances. Instead of commonly used steel nuts, different plate fixing designs were investigated by both laboratory and site studies. In addition, the usability of nuts and energy absorbers made of the polyamide type engineering polymer was investigated to assess whether they are advantageous for the aim of supplying high-energy absorbing features. In this experimental study, deformation-controlled load tests were carried out to evaluate the bearing and energy absorption capacities of totally eight different groups of specimens. According to the findings from this study, use of the polyamide material with steel nuts as an energy absorber material, rather than using instead of steel nuts supplies good results. As another outcome, it has been determined that use of proper washers between steel nuts and polyamide absorbers can significantly improve the energy absorption performances. It has been evaluated that the energy absorption capacity of the bolt plates can be economically increased up to 10 times by using suitable polyamide energy absorbers placed between the plate and steel nut parts. It was concluded that the polyamides can be used to remarkably improve the rock bolting performances especially in the rock masses where the high energy absorption capacity property is needed, like those with rock bursting, squeezing and swelling problems.

show abstract

“…Formisano et al [26] showed that adding microscopic silicon carbide powders in different contents and aggregate sizes could improve the low abrasive wear resistance of an epoxy resin system. Laboratory testing results show that resins with some admixture incorporation possess improved compressive and shear strengths; and pullout testing results show that resin anchoring agent mixed admixture can increase the load bearing capacity of fully grouted rebar bolts [27][28][29][30][31].…”

Section: Introductionmentioning

confidence: 99%

Experimental study on anchorage performance of rockbolts by adding steel aggregates into resin anchoring agents

et al. 2021

View full text Add to dashboard Cite

Pull-out testing was carried out to evaluate the effects of shape, size and concentration of steel aggregates on anchorage performance. Steel grit with particle sizes of 1.5, 2.0, and 2.8 mm and steel shot diameters of 1.4, 2.0, and 2.5 mm were used as steel aggregates and were added into the resin anchoring agent. For each kind of steel aggregate, either 30, 40 or 50 aggregates were used to evaluate the effects of different steel aggregate densities. Anchorage specimens were prepared using ϕ20mm rebar bolts and steel sleeves. Compressive and shear strengths of resin containing steel aggregates, the pullout curve, and the circumferential strain of the sleeves were measured, and the energy consumption was calculated. Results show that compressive and shear strengths of resin containing steel grit and steel shot are increased by 8.4%-17.0% compared to pure resin. For the aggregate numbers of 30, 40 and 50, the anchoring force is increased by 7.9%, 7.5% and 6.5%; energy consumption is increased by 19.2%, 15.0% and 18.6%; and the circumferential strain of the specimen is increased by 28.4%, 25.1% and 39.5%, respectively. The effect of aggregate size on anchoring performance is significant; that is, the aggregate sizes of 1.4~1.5, 2.0 and 2.5~2.8 mm increase the anchoring force, energy consumption and sleeve circumferential strain by 8.5%, 4.6% and 8.7%, 16.0%, 8.4% and 28.4%, and 17.9%, 23.3% and 51.9%, respectively. The relationships of the anchoring force, energy consumption, and circumferential strain with steel aggregate quantity and size are formulated. Results show that the addition of steel aggregates increases the compressive and shear strengths of the resin, and steel aggregate quantity and size have significant impact on anchoring performance. This paper provides the basis for optimization of resin anchoring agents used in the mining industry. The impact of anchoring agent shear strength and residual shear strength on the anchoring effect were also discussed based on the failure analysis of the anchoring section.

show abstract

An Investigation of Using Thermoset Polymer Type Liquid Additives to Improve Cement Grout Performances in Rock Bolting Applications

Cited by 4 publications

References 34 publications

A Resin Type Additive Use to Improve Load Bearing Capacities of Grouted Rock Bolts Exposed to Thermal Cycles

A Resin Type Additive Use to Improve Load Bearing Capacities of Grouted Rock Bolts Exposed to Thermal Cycles

Investigation of New Energy Absorbing Mechanisms Used to Fix Rock Bolt Plates

Experimental study on anchorage performance of rockbolts by adding steel aggregates into resin anchoring agents

Contact Info

Product

Resources

About