A modified, hydrophobic soundless cracking demolition agent for non-explosive demolition and fracturing applications

Silva, V.R.S. De; Ranjith, P.G.; Perera, M.S.A.; Wu, Bailin; Rathnaweera, T.D.

doi:10.1016/j.psep.2018.07.010

Cited by 42 publications

(20 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Considering the composition of SREMA, it has four basic components, which are the elementary SCDA mixture, welan gum as the viscosity enhancing agent, sodium naphthalene sulfonate formaldehyde (SNSF) as the high range water reducer (HRWR) and calcium chloride as the accelerator [13]. Yet, SREMA can be further developed depending on the SCDA used, to cater the ground and environmental conditions that need to be met.…”

Section: Components Of Sremamentioning

confidence: 99%

“…To accelerate the system, calcium chloride, a commonly used accelerator in the cement industry, has been found to be satisfactory [39,40]. However, increasing the amount of CaCl 2 does not increase the expansive energy, but rather shows an immediate volume expansion as soon as the slurry is mixed, giving a low expansive energy peak and remaining at a constant but poorer level [13].…”

Section: Components Of Sremamentioning

confidence: 99%

“…Regarding the acceleration behavior of CaCl 2 , many articles have suggested that it can promote the dissolution of cement, accelerate the formation of hydration products, and increase the heat flow rate of tricalcium silicate hydration [94], shortening the pre-induction and induction period, leading to a faster expansion [13]. This suggests that CaCl 2 would promote the dissolution of specifically tricalcium silicate and accelerate the supersaturation of hydration products, triggering the initiation of acceleration of the hydration products by nucleation [95].…”

Section: Effect Of Calcium Chloridementioning

confidence: 99%

“…However, when considering deep-earth mining and hydrocarbon extraction, which goes about five kilometers into the earth, this formula cannot be directly used. This is mainly as expansive cements would tend to dilute in the presence of high-water content, eventually leading to the wash off of the product and uncontrolled hydration [13]. Over the past few decades, elementary SCDAs have been developed into modified SCDA [13], also known as slow releasing energy material agent (SREMA), with the incorporation of additives such as superplasticizers, viscosity enhancing agents and accelerators.…”

Section: Introductionmentioning

confidence: 99%

“…This is mainly as expansive cements would tend to dilute in the presence of high-water content, eventually leading to the wash off of the product and uncontrolled hydration [13]. Over the past few decades, elementary SCDAs have been developed into modified SCDA [13], also known as slow releasing energy material agent (SREMA), with the incorporation of additives such as superplasticizers, viscosity enhancing agents and accelerators. This formula has been patented by Gamage et al as an improved demolition agent [14].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

The Hydration and Volume Expansion Mechanisms of Modified Expansive Cements for Sustainable In-Situ Rock Fragmentation: A Review

Liyanage

Ranjith

2021

Energies

View full text Add to dashboard Cite

This review provides the hydration and volume expansion mechanism of expansive materials, with the goal of utilizing them in the development of sustainable mining methods. The main focus of the review will be the newly developed non-destructible rock fragmentation method, slow releasing energy material agent (SREMA), which is a modified soundless chemical demolition agent (SCDA). The review aims to address one of the main gaps in studies related to SREMA, by presenting a thorough understanding of the components of SREMA and their mechanisms of action, leading to volume expansion. Thus, this review would act as a guide for researchers working on using expansive materials for rock breaking. As many literatures have not been published regarding the recently discovered SREMA, studies on cements, expansive cements, and soundless chemical demolition agents (SCDA) were mainly considered. The chemical reactions and volume expansive processes of these materials have been studied and incorporated with the additives included in SREMA, to understand its behavior. Literature containing experimental studies analyzing the heat of hydration and microstructural changes have been mostly considered along with some of the heavily discussed hypotheses regarding the hydration of certain components, to predict the volume expansive mechanism of SREMA. Studies related to SREMA and other similar materials have shown drastic changes in the heats of hydration as the composition varies. Thus, SREMA has the capability of giving a wider range of expansive energies in diverse environmental conditions

show abstract

Section: Components Of Sremamentioning

confidence: 99%

Section: Components Of Sremamentioning

confidence: 99%

Section: Effect Of Calcium Chloridementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

The Hydration and Volume Expansion Mechanisms of Modified Expansive Cements for Sustainable In-Situ Rock Fragmentation: A Review

Liyanage

Ranjith

2021

Energies

View full text Add to dashboard Cite

show abstract

A study on the optimal use of soundless cracking demolition agents in fragmentations of concrete based on the extended finite element method

Zhong

Zhang

Yang

et al. 2022

Structural Concrete

View full text Add to dashboard Cite

Soundless cracking technique has been widely applied in the demolition of rock and concrete structures because of its cleaner advantages compared with conventional explosive methods. However, the correlations between fracturing processes and characteristics of soundless cracking demolition agents (SCDAs) and the optimal use of SCDA in improving the efficiency of demolition are still poorly documented. In this concern, this study develops a reliable numerical model verified by experimental data to investigate the optimal use of SCDA in fragmentations of concrete based on the extended finite element method. The simulated results reveal that the minimum hole diameter is 26 mm required to break the concrete cube of 150 mm, and the crack process can be divided into three phases of initiation, propagation, and coalescence according to the energy release rate. Moreover, the proposed method is employed in simulating the crack process of meter-scale concrete blocks with two predrilled holes, and the optimal hole spacing of 350 mm is then determined. This study provides some insights for improving the efficiency of SCDA in the field applications.

show abstract

Effect of longitudinal reinforcement on the soundless chemical demolition degree of reinforced concrete columns

Zheng

Tian

et al. 2022

Structural Concrete

View full text Add to dashboard Cite

Soundless chemical demolition has great potential for application in the field of building demolition in densely built areas. However, the application of this method was limited due to less guidance can be applied to reinforced concrete. Thus, this study investigated the effect of longitudinal reinforcement on the crushing degree of concrete columns. Experimental results showed that the number of steel bars had a greater impact on the development of crack width than diameter. Moreover, the longitudinal reinforcement had a greater impact on the transverse cracks than other types of cracks. This study introduced fractal dimension and characteristic value of specimen to describe the overall crushing degree and reinforcement arrangement of the specimens, respectively. The fractal dimension increased with an increase in the characteristic value. This study explored the influence of longitudinal reinforcement on the crushing degree of concrete columns, which laid the foundation for soundless chemical demolition of buildings in densely built areas.

show abstract

A modified, hydrophobic soundless cracking demolition agent for non-explosive demolition and fracturing applications

Cited by 42 publications

References 39 publications

The Hydration and Volume Expansion Mechanisms of Modified Expansive Cements for Sustainable In-Situ Rock Fragmentation: A Review

The Hydration and Volume Expansion Mechanisms of Modified Expansive Cements for Sustainable In-Situ Rock Fragmentation: A Review

A study on the optimal use of soundless cracking demolition agents in fragmentations of concrete based on the extended finite element method

Effect of longitudinal reinforcement on the soundless chemical demolition degree of reinforced concrete columns

Contact Info

Product

Resources

About