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Journal Article 4

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2022 1

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2009 2

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admixtures 1

cementitious system 1

compatibility of cement 1

cracking 1

durability performance 1

fresh concrete 1

high performance concrete 1

high performance concrete with high-volume supplemementary cementitious materials 1

manufactured sand 1

mechanical properties 1

microfines 1

mineral additive 1

mineral admixtures 1

permeability reducing admixture 1

polycarboxylate water-reducing admixtures 1

preparion and construction 1

quality control 1

quality retention 1

shrinkage 1

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Effect of mineral additives and permeability reducing admixtures having different action mechanisms on

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 5,   Pages 1277-1291 doi: 10.1007/s11709-021-1752-2

Abstract: In this paper, the effect of usage of the permeability reducing admixture (PRA) having different action mechanisms on hardened state properties of cementitious systems containing mineral additives is examined. For this aim, three commercial PRAs were used during investigation. The effective parameters in the first and third PRAs were air-entraining and high-rate air-entraining, respectively. The second one contained the insoluble calcium carbonate residue and had a small amount of the air-entraining property. Mortar mixes with binary and ternary cementitious systems were prepared by partially replacing cement with fly ash and metakaolin. The hardened state properties of mortar mixtures such as compressive strength, ultrasonic pulse velocity, water absorption, drying shrinkage and freeze–thaw resistance were investigated. The ternary cement-based mixture having both fly ash and metakaolin was selected as the most successful mineral-additive bearing mix in regard to hardened state properties. In this sense, PRA-B, with both insoluble residues and a small amount of air-entraining properties, showed the best performance among the mixtures containing PRA. The combined use of mineral additive and PRA had a more positive effect on the properties of the mixes.

Keywords： cementitious system     mineral additive     permeability reducing admixture     mechanical properties     durability performance    

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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 for river sand in concrete. High-grade parent rocks are crushed to obtain MS, which also produces a considerable amount of microfine aggregate (MFA). The higher percentage of MFA could lead to both positive and negative effects on the performance of cement-based mixes. This research was done to examine the influence of varying MFA levels, specifically 0%, 3%, 6%, 9%, and 12% (by weight) as the partial replacements of MS on bleeding and plastic shrinkage cracking of concrete. In addition to the varying MFA levels, some concrete mixes also included fly ash (FA) and superplasticizer to investigate the effect of free-water content in the mixes. The bleeding test data were taken as on-site measurements, while the cracks from the plastic shrinkage cracking test were evaluated using an image processing technique. The results concluded that the MFA replacements and the effective water-to-cement ratio have a significant effect on the selected concrete properties. With the increasing replacement levels, cumulative bleeding and crack initiation life gradually decreased, while a progressive increase was observed for crack width, crack length, and crack area.

Keywords： manufactured sand     fresh concrete     microfines     admixtures     shrinkage     cracking    

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The application of polycarboxylates water-reducing admixture to passenger dedicated line engineering

Huang Zhijiu

Strategic Study of CAE 2009, Volume 11, Issue 1,   Pages 75-80

Abstract: Problems of engineering application of polycarboxylates water-reducing admixtures were analyzed.polycarboxylates application is to settle the compatibility with cement andkeep the quality retention of this admixtures

Keywords： polycarboxylate water-reducing admixtures     compatibility of cement     quality retention     high performance    

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Applied research on high performance concrete with high volume supplemementary cementitious materials in No.4 Bid of the Beijing-Shanghai high speed railway

Gao Zhishuang, Zhao Nianquan, Zhao Changyu, Hu Mingwen, Gou Yunlong

Strategic Study of CAE 2009, Volume 11, Issue 1,   Pages 26-31

Abstract: high speed railway, effect to concrete workability, meachincal performance, and durability of mineral admixtures

Keywords： mineral admixtures     high performance concrete with high-volume supplemementary cementitious materials    

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Title Author Date Type Operation

Effect of mineral additives and permeability reducing admixtures having different action mechanisms on

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

The application of polycarboxylates water-reducing admixture to passenger dedicated line engineering

Huang Zhijiu

Journal Article

Applied research on high performance concrete with high volume supplemementary cementitious materials in No.4 Bid of the Beijing-Shanghai high speed railway

Gao Zhishuang, Zhao Nianquan, Zhao Changyu, Hu Mingwen, Gou Yunlong

Journal Article