Modified non-explosive expansive cement for preconditioning deep host rocks: A review

Manatunga, U. I.; Ranjith, P.G.; Silva, V.R.S. De; Wanniarachchi, W.A.M.

doi:10.1007/s40948-021-00292-z

Cited by 12 publications

(4 citation statements)

References 96 publications

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“…However, the high temperatures and blowholes generated by the hydration reaction have limited the use and development of SCDAs. Calcium oxide (CaO) is the main ingredient of SCDAs (with a content of about 80-95%) [14][15][16], which generates a large amount of heat during the hydration reaction. If excessive heat is accumulated in the slurry and not released in time, it can easily cause violent reactions during the test, damaging the strain gauges or creating blowholes.…”

Section: Introductionmentioning

confidence: 99%

Prevention of Blowout Tests in Large-Diameter Boreholes with Soundless Chemical Demolition Agents and Fracturing Characteristics of Hard Sandstones

Wu,

Dong,

Yuan

et al. 2024

Processes

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Increasing the diameter of the drillhole can facilitate drillhole breakage using soundless chemical demolition agents, but it is prone to cause drillhole blowout, resulting in crushing failure. This paper conducted a blowhole prevention test on a large borehole using the internal insertion cooling pipe method (ICBPM) to test the expansion pressure of cooling pipes with different diameters. During this test, a fracture occurred in a hole with a 75 mm inner diameter in the rectangular sandstone specimens with high strength. It was found that utilizing the ICBPM can effectively hinder the development of blowholes. Expansion and blowhole prevention are optimized with a 0.14 mass ratio of the cooling water to demolition agent and a maximum expansion stress of 49.0 MPa. The guiding effect of the minimum resistance line is significant. In repeated tests, all fissures are distributed in a Y-shape on the free surface where the minimum resistance line is located. The acoustic emission signals from statically fractured hard rock increase abruptly before damage, and the development of rock expansion and fracturing can be obtained through strain monitoring. These results suggest that the ICBPM can reduce the expansion time with a strong crushing effect, satisfying the need to process more crushing projects.

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Section: Introductionmentioning

confidence: 99%

Prevention of Blowout Tests in Large-Diameter Boreholes with Soundless Chemical Demolition Agents and Fracturing Characteristics of Hard Sandstones

Wu,

Dong,

Yuan

et al. 2024

Processes

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“…SCDA is an expansive powdery cementitious material, and its application involves mixing it with water prior to injecting it into boreholes drilled in rock. SCDA has been modified for improved workability, washout resistance and setting time by mixing it with various admixtures, and it can be used in underground rock fragmentation applications below the water table (De Silva et al 2018aManatunga et al 2021). The modified SCDA is known as Slow-Releasing Energy Material (SREMA), which consists of diutan gum (a viscosifier) and polycarboxylate ether (superplasticizer), enhances rheological properties and washout resistance of SCDA (Manatunga et al 2022).…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Slow-Releasing Energy Material (SREMA) Injection for In-Situ Rock Breaking Under Uniaxial and Triaxial Loading: An Experimental Study

Manatunga,

Ranjith,

De Silva

et al. 2024

Rock Mech Rock Eng

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Permeability enhancement of impervious rock formations is crucial for the exploitation of ore deposits, which are uneconomic using conventional mining methods. These deposits have the potential to be mined with in-situ recovery (ISR) mining methods, provided the deposit’s permeability is enhanced artificially. Slow-releasing energy material (SREMA) has been identified as a promising preconditioning technique to enhance rock permeability for ISR. However, the fracturing potential of SREMA in the presence of in-situ stresses remains under-explored in laboratory experimental research studies and needs to be assessed in detail prior to field trials. A unique confining cell was developed in this study to represent realistic confining stresses underground, and the impacts of different stress conditions on the fracturing potential of SREMA were investigated. In addition, the effects of SREMA expansion in pre-existing joints were also assessed using laboratory fracturing experiments conducted by injecting SREMA into sandstone specimens with artificially created horizontal persistent joints, which is the first attempt to the best of the author’s knowledge. Under uniaxial stress conditions (10 MPa), multiple radial cracks emerged from the borehole at the centre of the specimen, while vertical splitting of the specimen was observed due to the outward expansion of SREMA inside the joint. In comparison, under triaxial confinement (5 MPa and 10 MPa), a decrease in the damage caused to the rock mass due to the expansive pressure generated by SREMA was observed, and this was overcome by introducing multiple injection holes and stress relief holes into the rock mass.

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“…The feasibility of SCDAs in the demolition industry has been fully proved. CaO is the component with the highest proportion of SCDAs, which results in the volumetric expansion as an impact of the hydration products 19–21 . MgO, Al 2 O 3 , SiO 2 , etc., as the minor constituents, are used to improve the performance of SCDAs 13 .…”

Section: Introductionmentioning

confidence: 99%

“…CaO is the component with the highest proportion of SCDAs, which results in the volumetric expansion as an impact of the hydration products. [19][20][21] MgO, Al 2 O 3 , SiO 2 , etc., as the minor constituents, are used to improve the performance of SCDAs. 13 After the mixed slurry is poured into the hole, the increasing self-expansion is constrained by the medium around the hole.…”

Section: Introductionmentioning

confidence: 99%

Green demolition technology of reinforced concrete slab: Application of soundless chemical demolition agents and its evaluation system

Jiang

Zheng

Wang

et al. 2023

Structural Concrete

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The annual global building demolition is burdensome due to the rapid development of cities. The pollution associated with building demolition severely endangers the urban environment. Soundless chemical demolition agents (SCDAs) can effectively avoid environmental hazards in the demolition of concrete buildings. However, related literature on optimal hole layout design is still vacant. The demolition of reinforced concrete slabs was therefore explored in this paper. In total, 18 slab specimens were tested. Results showed that the slab specimens were demolished into several blocks due to sufficient development of cracks. Following this, a set of complete evaluation system was proposed. First, the volumetric expansion ratio of SCDAs was provided as a new evaluation index. Based on this evaluation index, the influences of critical parameters and the influence mechanism of reinforcements were investigated. Second, a novel multi‐parameter hole layout computational model was established. With this model, an optimal hole layout scheme could be obtained. Finally, the application prospect of SCDAs was discussed. This work can open up a new vision for the demolition industry.

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Modified non-explosive expansive cement for preconditioning deep host rocks: A review

Cited by 12 publications

References 96 publications

Prevention of Blowout Tests in Large-Diameter Boreholes with Soundless Chemical Demolition Agents and Fracturing Characteristics of Hard Sandstones

Prevention of Blowout Tests in Large-Diameter Boreholes with Soundless Chemical Demolition Agents and Fracturing Characteristics of Hard Sandstones

Evaluation of Slow-Releasing Energy Material (SREMA) Injection for In-Situ Rock Breaking Under Uniaxial and Triaxial Loading: An Experimental Study

Green demolition technology of reinforced concrete slab: Application of soundless chemical demolition agents and its evaluation system

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