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Expansion agent expansion and mechanical crushing expansion agent expansion and mechanical crushing expansion agent expansion and mechanical crushing
Engineering performance and expansion mechanism of MgO
2023年6月1日 The effects of different reactivity (R–MgO, M − MgO and S–MgO) and content (0–12 wt%) of MgO expansive agent on the restrained expansion and mechanical properties 2022年11月1日 Rolled static cracking agent (RSCA) can solve the intractable problem of traditional bulk static cracking agent (BSCA) in engineering applications This paper Experimental study on expansion and cracking properties of 2024年10月6日 In this paper, for a roadway expansion project of the central transportation lane of the mine, the mechanical parameters of the roadway surrounding rock was tested, the Rock Fracturing Characteristics and Roadway Expansion 2023年12月26日 The effect of multiscale MgO expansion agent and SAP on the mechanical, working, and shrinkage properties of UHPC was investigated, and the synergistic mechanism Synergistic Effects of Multiscale MgO Expansion Agent and
Study on Mechanism of Static BlastingInduced
2023年10月14日 In this study, mechanical derivation, laboratory experiments, and numerical simulation research methodologies are used to evaluate the fracturing process of the static crushing agent (SCA) From a mechanical 2020年11月25日 The expansion pressure of the SSC is influenced by roll diameter, agent packing density, and insertion gap The expansion pressure is most sensitive to the insertion An Experimental Study on the Mechanical Properties and Expansion 2023年9月8日 The expansion reaction of the expansion agent (EA) can effectively compensate for the shrinkage of UHPC, but the expansion agent has high hydration activity in the early stage, which leads to the lack of internal Coupling Effect of Expansion Agent and Internal 2023年10月11日 SRA and active MEA have a synergistic effect in compensating the volume shrinkage of cement, the addition of SRA delays the hydration of MEA, which can avoid the Effect of SRA and active MgO expansive agent on volume
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Experimental investigation of expansion behavior and
2021年5月22日 Traditional grouting technology only provides a bonding effect to surrounding rock fissures Here, a new expansive grout was prepared using a highefficiency soundless 2021年5月5日 The expansion mechanism of magnesium oxide expansive hydraulic cement as a novel expansive hydraulic cement was reviewed Anisotropic crystallization results in crystal Expansion Mechanism and Properties of Magnesium Oxide 2023年10月14日 How to deal with hard rock cheaply and safely is a pressing issue in today’s coal mining Weakening fractures of hard rock have always been a significant concern in China’s coal mine engineering In this study, Study on Mechanism of Static BlastingInduced 2021年6月1日 Expansion agent is a useful cement anticracking admixture It can enhance the penetration and sealing ability of the material Adding expansion agent to the material is an essential technical means to solve the shrinkage and cracking problem of cementbased engineering [20, 21] Therefore, researchers have done a lot of research workEffect of polyvinyl alcohol/aluminum microcapsule expansion agent
Effects of CaObased and MgObased expansion agent,
2020年10月10日 The addition of expansive agent is one of the most effective ways to compensate for the thermal and autogenous shrinkage of HSHPC and reduce the crack risk Among the expansive agents, CaObased expansion agent (CEA) and MgObased expansion agent (MEA) are widely used [12], [13] However, CEA and MEA were usually used alone2023年12月26日 The effect of multiscale MgO expansion agent and SAP on the mechanical, working, and shrinkage properties of UHPC was investigated, and the synergistic mechanism of mixing multiscale expansion agent and SAP was elucidated using scanning electron microscopy (SEM), Xray diffraction analysis (XRD), mercury intrusion porosimetry (MIP), and thermal Synergistic Effects of Multiscale MgO Expansion Agent and 2019年4月30日 The expansion components such as CaO in EA reacted to form Ca(OH)2 crystals, which increases in volume and generate expansion force that is transferred to the surrounding cement hydration products A simplified chemomechanical model of hydration and expansion 2021年5月5日 If the expansion rate exceeds 08%, the mechanical properties and durability changes caused by porosity should be considered If magnesium oxide expansive concrete is used with restraining in real structure, extra compressive stress is generated and the porosity decreases, compared with that during free expansion the ultimate expansion Expansion Mechanism and Properties of Magnesium Oxide
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Impact of HighPerformance Expansion and Shrinkage
2023年12月6日 The expansion agent used in this study is highperformance concrete expansion agent (HPEA), which is mainly a double expansion agent of AFT combined with CaO Compared with2023年9月8日 The expansion reaction of the expansion agent (EA) can effectively compensate for the shrinkage of UHPC, but the expansion agent has high hydration activity in the early stage, which leads to the lack of internal moisture; ie, the expansion effect can not be fully exerted, and the slurry is not sufficiently hydratedCoupling Effect of Expansion Agent and Internal Curing 2023年11月15日 Traditionally, these agents fall into categories based on their composition, such as calcium sulfoaluminate [13], CaO [14], MgO [11,15,16], and compound expansion agents [17,18] Expansion agents containing calcium sulfoaluminate prompt the formation of ettringite crystals during hydration, fostering expansive stresses to counteract shrinkage [19]Experimental studies on the volume stability of MgO expansion agent 2022年3月19日 Cracks easily generate in concrete at early age owing to the shrinkage deformation CaObased expansion agent (CEA) and superabsorbent polymers (SAP) have been extensively used for the mitigation of concrete shrinkage The macroscopic properties of concrete are highly determined by the microstructure In this study, the influence of CEA and SAP Influence of CaObased expansive agent, superabsorbent
Expansion Mechanism and Properties of
2021年5月5日 A basic method is given for predicting the expansion rate considering the expansive agent content in MgO expansive hydraulic cement A concise equation is proposed for calculating the ultimate 2023年3月30日 Cracking agents are indispensable and important products for national energy exploitation and largescale infrastructure construction Transient thermal expansion rock cracking agent is a new Preparation of a Transient Thermal Expansion 2022年4月6日 Freezethaw damage is one of the main factors affecting the service life and durability of concrete Optimizing the microscopic pore distribution of concrete is an effective measure to improve its frost resistance This paper takes mixed sand (machinemade sand + river sand) concrete as the research object and analyzes the influence mechanism of different Mechanical Properties and Micromorphology of Calcium Oxide Expansion 2022年9月28日 Aiming at the shortcomings of the current rockbreaking technology, a new type of highenergy expansion agent for energetic materials based on combustiontodetonation was developed By characterizing the basic physical and chemical properties of the highenergy expansion agent (HEEA) such as morphology, particle size distribution, and pyrolysis Study on Physicochemical Properties and RockCracking
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Numerical simulation of expansion process of soundless
2022年6月1日 Static crushing agent is a kind of powder material with high expansion characteristics and nonblasting properties prepared by grinding inorganic compounds with hightemperaturecalcined CaO as the 2022年6月13日 The obtained MEA activity, which can lead to different effects on the performance of concrete, varies significantly at different calcination temperatures [19]The main indicator of MEA is its reaction time, which can be characterized by the neutralization time with 007 M citric acid solution [20]It was indicated that the MEA with a reaction time of 50 s reacts Effect of magnesia expansion agent with different activity on 2023年6月1日 Ultrahigh performance concrete (UHPC), despite its excellent strength and toughness, has greater shrinkage The effects of different reactivity (R–MgO, M − MgO and S–MgO) and content (0–12 wt%) of MgO expansive agent on the restrained expansion and mechanical properties of UHPC were investigated and the relationship among restrained Engineering performance and expansion mechanism of MgO expansion agent 2024年1月13日 To promote the safe use of MgO expansive agent (MEA) in mass concrete, the influence of fineness and sintering temperature of MEA on the expansion, mechanical properties, and microstructure of fly ashPortland cement pastes was studied The results indicate that the agent prepared at 950 °C does not adversely affect the compressive strength of the pastes Influence of fineness of MgO expansive agent on expansion, mechanical
Experimental investigation of expansion behavior and
2021年7月2日 fined as the single free surface expansion ratio under pressure, which can be regarded as the development in onedirection expansion of the expansive grout under the action of crustal stress (2) Uniaxial compression tests To investigate the uniaxial compression mechanical properties of the expansive grout with different expansion agentWith an increase in expansion agent content, the final expansion ratio increased, but the expansion rate decreased With an increase in the curing pressure, the grout expansion effect decreased significantly (4) The proportion of the concave surfaces at the centre of the specimen crosssection reflected the specimen's porosity to a certain Expansion performance and mechanical properties of Effect of different environments on the selfhealing performance of Ultra HighPerformance Concrete – A systematic literature review Bin Xi, Liberato Ferrara, in Construction and Building Materials, 2023 331 Expansive agents Expansive agents are powders that generate expansion products during the hydration of cement The expansion compensates for the shrinkage Expansive Agent an overview ScienceDirect Topics2023年7月1日 Expansive agent (EA) and shrinkage reducing admixture (SRA) are utilized to reduce shrinkage and risk of cracking in concrete EA compensates shrinkage by initial expansion, and SRA reduces surface tension in the pore fluid Although EA and SRA effectively reduce shrinkage, they can impair microstructure of concrete at high contentsMechanism underlying effect of expansive agent and
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Mechanical Properties and Micromorphology of Calcium
2022年4月6日 This paper takes mixed sand (machinemade sand + river sand) concrete as the research object and analyzes the influence mechanism of different content of CaO expansion agent on the physical and mechanical properties and frost resistance of mixed sandenergy expansion agent (HEEA) was proposed The mechanism of the energetic material was that it only burned in open space without explosion, which ensured safety duringStudy on Physicochemical Properties and RockCracking 2023年8月14日 Figure 1 Diagram illustrating the static crushing agent hydration reaction's expansion mechanism It is important to note that the expansion pressure that forms in the same state ofMechanism of Hard Rock Static Blastinginduced Crack A nonexplosive demolition agent (expansion agent) is mainly used for the destruction of rocks and RC structures In powder form, it expands when humified To simulate the expansion of rebars due to corrosion, an aluminum pipe embedded in concrete is filled with an expansion agent (as illustrated in Figure 1)Bond strength degradation in concrete cracked by expansion agent
Rock Fracturing Characteristics and Roadway Expansion
2024年10月6日 Static crushing agent (SCA) offers advantages such as good safety, no harmful gases, and minimal vibration, making SCA ideal for rock crushing in mines or underground engineering To scientifically implement the section expansion of mine roadway, the rock mechanical parameters, SCA expansion properties, and cracking behavior of surrounding rock 2021年6月1日 The relationship between the expansion agent and the material expansion rate is shown in Fig 2 Material with a watercement ratio of 045 has a volume reduction of 052% after setting When the amount of expansion agent is less than 008%, the expansion ratio is linear with the amount of expansion agentEffect of polyvinyl alcohol/aluminum microcapsule expansion agent 2023年9月8日 Coupling Effect of Expansion Agent and Internal Curing Aggregate on Shrinkage of HighModulus UltraHighPerformance Concrete September 2023 Coatings 13(9):1571Coupling Effect of Expansion Agent and Internal Curing 2020年7月30日 What is special is that, at temperature rise stage, the free reference concrete generates 580 με expansion due to thermal expansion, the free concrete containing 3% CaO + 3% MgO (C1M1) and 45% CaO + 15% MgO (C3M1) generates 788 με and 800 με expansion, and the core reference concrete and core concrete containing 3% CaO + 3% MgO (C1M1 Effect of CaO and MgO based expansive agent on
Study on Mechanism of Static BlastingInduced
2023年10月14日 How to deal with hard rock cheaply and safely is a pressing issue in today’s coal mining Weakening fractures of hard rock have always been a significant concern in China’s coal mine engineering In this study, 2021年6月1日 Expansion agent is a useful cement anticracking admixture It can enhance the penetration and sealing ability of the material Adding expansion agent to the material is an essential technical means to solve the shrinkage and cracking problem of cementbased engineering [20, 21] Therefore, researchers have done a lot of research workEffect of polyvinyl alcohol/aluminum microcapsule expansion agent 2020年10月10日 The addition of expansive agent is one of the most effective ways to compensate for the thermal and autogenous shrinkage of HSHPC and reduce the crack risk Among the expansive agents, CaObased expansion agent (CEA) and MgObased expansion agent (MEA) are widely used [12], [13] However, CEA and MEA were usually used aloneEffects of CaObased and MgObased expansion agent, 2023年12月26日 The effect of multiscale MgO expansion agent and SAP on the mechanical, working, and shrinkage properties of UHPC was investigated, and the synergistic mechanism of mixing multiscale expansion agent and SAP was elucidated using scanning electron microscopy (SEM), Xray diffraction analysis (XRD), mercury intrusion porosimetry (MIP), and thermal Synergistic Effects of Multiscale MgO Expansion Agent and
A simplified chemomechanical model of hydration and expansion
2019年4月30日 The expansion components such as CaO in EA reacted to form Ca(OH)2 crystals, which increases in volume and generate expansion force that is transferred to the surrounding cement hydration products 2021年5月5日 If the expansion rate exceeds 08%, the mechanical properties and durability changes caused by porosity should be considered If magnesium oxide expansive concrete is used with restraining in real structure, extra compressive stress is generated and the porosity decreases, compared with that during free expansion the ultimate expansion Expansion Mechanism and Properties of Magnesium Oxide 2023年12月6日 The expansion agent used in this study is highperformance concrete expansion agent (HPEA), which is mainly a double expansion agent of AFT combined with CaO Compared withImpact of HighPerformance Expansion and Shrinkage 2023年9月8日 The expansion reaction of the expansion agent (EA) can effectively compensate for the shrinkage of UHPC, but the expansion agent has high hydration activity in the early stage, which leads to the lack of internal moisture; ie, the expansion effect can not be fully exerted, and the slurry is not sufficiently hydratedCoupling Effect of Expansion Agent and Internal Curing
Experimental studies on the volume stability of MgO expansion agent
2023年11月15日 Traditionally, these agents fall into categories based on their composition, such as calcium sulfoaluminate [13], CaO [14], MgO [11,15,16], and compound expansion agents [17,18] Expansion agents containing calcium sulfoaluminate prompt the formation of ettringite crystals during hydration, fostering expansive stresses to counteract shrinkage [19]2022年3月19日 Cracks easily generate in concrete at early age owing to the shrinkage deformation CaObased expansion agent (CEA) and superabsorbent polymers (SAP) have been extensively used for the mitigation of concrete shrinkage The macroscopic properties of concrete are highly determined by the microstructure In this study, the influence of CEA and SAP Influence of CaObased expansive agent, superabsorbent