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Destructive and non-destructive evaluation of concrete for optimum sand to aggregate volume ratio

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 6, Pages 1400-1414 doi: 10.1007/s11709-021-0779-8

Abstract: Aggregates are the biggest contributor to concrete volume and are a crucial parameter in dictating itsAs such, a detailed experimental investigation was carried out to evaluate the effect of sand-to-aggregatevolume ratio (s/a) on the mechanical properties of concrete utilizing both destructive, 0.40, 0.44, 0.48, 0.52, and 0.56), cement content (340 and 450 kg/m³), water-to-cement ratiomix designs; optimum ratios of s/a were found to be 0.40 and 0.44 for the maximum aggregate

Keywords： aggregates non-destructive testing sand-to-aggregate volume ratio (s/a) maximum aggregate

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Effects of coarse and fine aggregates on long-term mechanical properties of sea sand recycled aggregate

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 3, Pages 754-772 doi: 10.1007/s11709-021-0711-2

Abstract: Typical effects of coarse and fine aggregates on the long-term properties of sea sand recycled aggregateTwo different types of fine (coarse) aggregates are considered: sea sand and river sand (natural andHowever, the Poisson’s ratio reduces after 2 years.and cement mortar reduce by adopting sea sand.The aggregate type changes the crack characteristics and propagation of SSRAC.

Keywords： sea sand recycled aggregate concrete recycled coarse aggregate replacement percentage sea sand chloride

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Effects of microfine aggregate in manufactured sand on bleeding and plastic shrinkage cracking of concrete

Branavan ARULMOLY; Chaminda KONTHESINGHA; Anura NANAYAKKARA

Frontiers of Structural and Civil Engineering 2022, Volume 16, Issue 11, Pages 1453-1473 doi: 10.1007/s11709-022-0877-2

Abstract: Construction industries have started to utilize manufactured sand (MS) as an effective alternative forriver sand in concrete.High-grade parent rocks are crushed to obtain MS, which also produces a considerable amount of microfine aggregateThe results concluded that the MFA replacements and the effective water-to-cement ratio have a significant

Keywords： manufactured sand fresh concrete microfines admixtures shrinkage cracking

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Long term performance of recycled concrete beams with different water–cement ratio and recycled aggregate

Jingwei YING; Feiming SU; Shuangren CHEN

Frontiers of Structural and Civil Engineering 2022, Volume 16, Issue 3, Pages 302-315 doi: 10.1007/s11709-022-0803-7

Abstract: The purpose of this study is to reveal the service performance of recycled aggregate concrete (RAC) componentsfor different values of water−cement ratio and replacement rate of recycled coarse aggregate (RCA).requirements when changing the replacement rate of RCA, it is necessary to change the water−cement ratioResults showed that the damage pattern of RAC was the same as that of natural aggregate concrete (NACThe water−cement ratio has an evident influence on the axial compressive strength and early creep of

Keywords： recycled concrete beam the replacement rate of recycled coarse aggregate water–cement ratio digital

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Experimental research on the mixed sand ratio and initial dry density of weathered sand improved expansive

Yang Jun,Yang Zhi,Zhang Guodong,Tang Yunwei and Chen Hongping

Strategic Study of CAE 2014, Volume 16, Issue 2, Pages 73-78

Abstract: Key analysis free load swelling rate of a non-load time，the proportion of mixed sand，the relationshipexpansion and eventually stabilize in three stages；during the initial dry density is constant，weathered sandsoil free load swelling rate will increase the proportion of sand mixed with the rapid decrease slowlyafter the first lower，weathered sand soil modified free load swelling rate is not sensitive to the amountof sand mixed；in the same mixed sand ratio， weathered sand soil free load swelling rate increases with

Keywords： expansive soils weathered sand initial dry density mixing sand ratio free load swelling rate

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Investigation into viability of using two-stage (pre-placed aggregate) concrete in Irish setting

John O’MALLEY, Hakim S. ABDELGADER,

Frontiers of Structural and Civil Engineering 2010, Volume 4, Issue 1, Pages 127-132 doi: 10.1007/s11709-010-0007-4

Abstract: Two-stage (pre-placed aggregate) concrete (TSC) consists of coarse aggregate, which is first depositedstudy the formation of grout for two stage concrete was investigated using readily available 5 mm sandAs a result, the use of 5 mm sand and a slow speed mixer in combination were found to be not conducive

Keywords： grout pre-placed concrete two-stage concrete (TSC)

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Pre-chamber turbulent jet ignition of methane/air mixtures with multiple orifices in a large bore constant volumechamber: effect of air-fuel equivalence ratio and pre-mixed pressure

Xiang LI, Wenzheng ZHANG, Zhong HUANG, Dehao JU, Li HUANG, Mingzhi FENG, Xingcai LU, Zhen HUANG

Frontiers in Energy 2019, Volume 13, Issue 3, Pages 483-493 doi: 10.1007/s11708-019-0631-1

Abstract: pre-chamber turbulent jet ignition (TJI) can permit combustion and flame propagation in a large-bore volumeTo investigate the effect of air-fuel equivalence ratio and pre-mixed pressure on pre-chamber TJI ofmethane/air mixtures with multiple orifices in a large bore volume, experimental tests and computationalorientation of the spark plug, resulting in the inhomogeneous distribution of combustion in the constant volume

Keywords： marine engine natural gas methane turbulent jet ignition (TJI) pre-chamber

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An improved algorithm for McDowell’s analytical model of residual stress

Zhaoxu QI,Bin LI,Liangshan XIONG

Frontiers of Mechanical Engineering 2014, Volume 9, Issue 2, Pages 150-155 doi: 10.1007/s11465-014-0295-9

Abstract: According to the volume-constancy of plastic deformation, an improved algorithm for McDowell’sother at any point within the component is derived, and the relationship is applied to McDowell’spredicted by modified method is much closer to the FEM results than the results predicted by McDowell’s

Keywords： residual stress McDowell’s model volume-constancy of plastic deformation FEM elastoplastic rolling/sliding

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Numerical simulation of compaction parameters for sand-filled embankment using large thickness sand filling

Wentao WANG, Chongzhi TU, Rong LUO

Frontiers of Structural and Civil Engineering 2018, Volume 12, Issue 4, Pages 568-576 doi: 10.1007/s11709-017-0444-4

Abstract: The study uses the finite element method to simulate a new technique of highway sand embankment fillingin Jianghan Plain district, which can raise the thickness of sand-filled layer from 30 cm to 70 cm andcan significantly shorten the construction period based on the guarantee of sand embankment constructionThe simulation results indicate that the sand-filled layer thickness of 70 cm is suitable for the newsand filling technique, and the sand-filled embankment project with tight construction period is suggested

Keywords： sand embankment compaction in large thickness numerical simulation small size vibratory roller steady

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Unified description of sand behavior

Feng ZHANG, Bin YE, Guanlin YE

Frontiers of Structural and Civil Engineering 2011, Volume 5, Issue 2, Pages 121-150 doi: 10.1007/s11709-011-0104-z

Abstract: In this paper, the mechanical behavior of sand, was systematically described and modeled with a elastoplasticWithout losing the generality of the sand, a specific sand called as Toyoura sand, a typical clean sandIn the model, the results of conventional triaxial tests of the sand under different loading and drainageloading tests, then they are fixed to uniquely describe the overall mechanical behaviors of the Toyoura sand

Keywords： constitutive model sand stress-induced anisotropy density structure

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Recovery of free volume in PIM-1 membranes through alcohol vapor treatment

Faiz Almansour, Monica Alberto, Rupesh S. Bhavsar, Xiaolei Fan, Peter M. Budd, Patricia Gorgojo

Frontiers of Chemical Science and Engineering 2021, Volume 15, Issue 4, Pages 872-881 doi: 10.1007/s11705-020-2001-2

Abstract: Physical aging is currently a major obstacle for the commercialization of PIM-1 membranes for gas separation applications. A well-known approach to reversing physical aging effects of PIM-1 membranes at laboratory scale is soaking them in lower alcohols, such as methanol and ethanol. However, this procedure does not seem applicable at industrial level, and other strategies must be investigated. In this work, a regeneration method with alcohol vapors (ethanol or methanol) was developed to recover permeability of aged PIM-1 membranes, in comparison with the conventional soaking-in-liquid approach. The gas permeability and separation performance, before and post the regeneration methods, were assessed using a binary mixture of CO and CH (1:1, v:v). Our results show that an 8-hour methanol vapor treatment was sufficient to recover the original gas permeability, reaching a CO permeability>7000 barrer.

Keywords： polymer of intrinsic microporosity (PIM) PIM-1 physical aging gas separation vapor-phase regeneration

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Influence of loading ratio on flat slab connections at elevated temperature: A numerical study

S. AL-HAMD, Martin GILLIE, Safaa Adnan MOHAMAD, Lee S. CUNNINGHAM

Frontiers of Structural and Civil Engineering 2020, Volume 14, Issue 3, Pages 664-674 doi: 10.1007/s11709-020-0620-9

Abstract: subjected to high temperature, the degree of in-service loading, commonly expressed as the loading ratioIn particular, the loading ratio may be pivotal in relation to the phenomenon of load-induced thermalDespite its potentially pivotal role, to date, the influence of the loading ratio on both material andIn this paper, the effect of the loading ratio is numerically investigated at both material and structural

Keywords： concrete finite elements fire load-induced thermal strain punching shear

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Experimental and parametrical investigation of pre-stressed ultrahigh-performance fiber-reinforced concrete railway sleepers

Frontiers of Structural and Civil Engineering 2023, Volume 17, Issue 3, Pages 411-428 doi: 10.1007/s11709-023-0928-3

Abstract: The main parameters investigated are the steel fiber volume fractions (0%, 0.5%, 1%, and 1.5%).Sleepers manufactured using UHPFRC with a steel fiber volume fraction of 1% and a concrete volume less

Keywords： ultrahigh performance fiber-reinforced concrete pull-out test static bending test steel fiber aspect ratio volume fraction

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Research review of the cement sand and gravel (CSG) dam

Xin CAI, Yingli WU, Xingwen GUO, Yu MING

Frontiers of Structural and Civil Engineering 2012, Volume 6, Issue 1, Pages 19-24 doi: 10.1007/s11709-012-0145-y

Abstract: The cement sand and gravel (CSG) dam is a new style of dam that owes the advantages both of the concrete

Keywords： cement sand and gravel (CSG) dam cement sand and gravel (CSG) material research review

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Grasping the Essence of Qian Xuesen's Theory on Sand Industry

Liu Shu

Strategic Study of CAE 2002, Volume 4, Issue 1, Pages 9-14

Abstract:

This paper describes the concept, scientific basis, key technical points and the significance of sandAs a scientific conceit for the utilization of desert Gobi, the essence of sand industry is to take theThe technical principle being employed in the present sand industry as so called “more lighting

Keywords： sand industry barren land solar energy assimilation knowledge-intensive agriculture desert and Gobi population

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Title Author Date Type Operation

Destructive and non-destructive evaluation of concrete for optimum sand to aggregate volume ratio

Journal Article

Effects of coarse and fine aggregates on long-term mechanical properties of sea sand recycled aggregate

Journal Article

Effects of microfine aggregate in manufactured sand on bleeding and plastic shrinkage cracking of concrete

Branavan ARULMOLY; Chaminda KONTHESINGHA; Anura NANAYAKKARA

Journal Article

Long term performance of recycled concrete beams with different water–cement ratio and recycled aggregate

Jingwei YING; Feiming SU; Shuangren CHEN

Journal Article

Experimental research on the mixed sand ratio and initial dry density of weathered sand improved expansive

Yang Jun,Yang Zhi,Zhang Guodong,Tang Yunwei and Chen Hongping

Journal Article

Investigation into viability of using two-stage (pre-placed aggregate) concrete in Irish setting

John O’MALLEY, Hakim S. ABDELGADER,

Journal Article

Pre-chamber turbulent jet ignition of methane/air mixtures with multiple orifices in a large bore constant volumechamber: effect of air-fuel equivalence ratio and pre-mixed pressure

Xiang LI, Wenzheng ZHANG, Zhong HUANG, Dehao JU, Li HUANG, Mingzhi FENG, Xingcai LU, Zhen HUANG

Journal Article

An improved algorithm for McDowell’s analytical model of residual stress

Zhaoxu QI,Bin LI,Liangshan XIONG

Journal Article

Numerical simulation of compaction parameters for sand-filled embankment using large thickness sand filling

Wentao WANG, Chongzhi TU, Rong LUO

Journal Article

Unified description of sand behavior

Feng ZHANG, Bin YE, Guanlin YE

Journal Article

Recovery of free volume in PIM-1 membranes through alcohol vapor treatment