Utilization of Construction Waste Composite Powder Materials as Cementitious Materials in Small-Scale Prefabricated Concrete

Advances in Materials Science and Engineering ◽

10.1155/2016/8947935 ◽

2016 ◽

Vol 2016 ◽

pp. 1-11 ◽

Cited By ~ 2

Author(s):

Cuizhen Xue ◽

Aiqin Shen ◽

Yinchuan Guo ◽

Tianqin He

Keyword(s):

Mechanical Properties ◽

Pore Structure ◽

Composite Powder ◽

Cementitious Materials ◽

Small Scale ◽

Powder Materials ◽

Hydration Products ◽

Construction Waste ◽

Construction And Demolition Wastes ◽

Composite Powder Material

The construction and demolition wastes have increased rapidly due to the prosperity of infrastructure construction. For the sake of effectively reusing construction wastes, this paper studied the potential use of construction waste composite powder material (CWCPM) as cementitious materials in small-scale prefabricated concretes. Three types of such concretes, namely, C20, C25, and C30, were selected to investigate the influences of CWCPM on their working performances, mechanical properties, and antipermeability and antifrost performances. Also the effects of CWCPM on the morphology, hydration products, and pore structure characteristics of the cement-based materials were analyzed. The results are encouraging. Although CWCPM slightly decreases the mechanical properties of the C20 concrete and the 7 d compressive strengths of the C25 and C30 concretes, the 28 d compressive strength and the 90 d flexural strength of the C25 and C30 concretes are improved when CWCPM has a dosage less than 30%; CWCPM improves the antipermeability and antifrost performances of the concretes due to its filling and pozzolanic effects; the best improvement is obtained at CWCPM dosage of 30%; CWCPM optimizes cement hydration products, refines concrete pore structure, and gives rise to reasonable pore size distribution, therefore significantly improving the durability of the concretes.

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Effects of Nano-CaCO3/Limestone Composite Particles on the Hydration Products and Pore Structure of Cementitious Materials

Advances in Materials Science and Engineering ◽

10.1155/2018/5732352 ◽

2018 ◽

Vol 2018 ◽

pp. 1-8 ◽

Cited By ~ 8

Author(s):

Huashan Yang ◽

Yujun Che

Keyword(s):

Mechanical Properties ◽

Pore Structure ◽

Reaction System ◽

Cementitious Materials ◽

Limestone Powder ◽

Composite Particles ◽

Gravimetric Analysis ◽

Hydration Products ◽

Scanning Calorimetry ◽

Necked Flask

The agglomeration of nano-CaCO3 (NC) is the largest bottleneck in applications in cementitious materials. If nano-CaCO3 modifies the surface of micron-scale limestone powder (LS), then it will form nano-CaCO3/limestone composite particles (NC/LS). It is known that micron-scale limestone is easily dispersed, and the “dispersion” of NC is governed by that of LS. Therefore, the dispersion of nano-CaCO3 can be improved by the NC/LS in cementitious materials. In this work, the preparation of NC/LS was carried out in a three-necked flask using the Ca(OH)2-H2O-CO2 reaction system. The morphology of NC/LS was observed by a field emission scanning electron microscope (FE-SEM). The effects of NC/LS on the hydration products and pore structure of cementitious materials are proposed. 5% NC/LS was added into cement paste and mortar, and the mechanical properties of the specimens were measured at a certain age. Differential scanning calorimetry (DSC), thermal gravimetric analysis (TG), and backscattered electron imaging (BSE) were conducted on the specimens to investigate the hydration products and pore structure. The properties of specimens with NC/LS were compared to that of control specimens (without NC/LS). The results revealed that NC/LS reduced the porosity and improved the mechanical properties of the cementitious materials.

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Research Progress on the Hydration of Portland Cement with Calcined Clay and Limestone

Materials Science Forum ◽

10.4028/www.scientific.net/msf.1036.240 ◽

2021 ◽

Vol 1036 ◽

pp. 240-246

Author(s):

Jin Tang ◽

Su Hua Ma ◽

Wei Feng Li ◽

Hui Yang ◽

Xiao Dong Shen

Keyword(s):

Mechanical Properties ◽

Portland Cement ◽

Cementitious Materials ◽

Supplementary Cementitious Materials ◽

Research Progress ◽

Hydration Reaction ◽

Hydration Products ◽

Early Hydration ◽

Calcined Clay ◽

Dense Microstructure

The use of calcined clay and limestone as supplementary cementitious materials, can have a certain influence on the hydration of Portland cement. This paper reviewed the influence of limestone and calcined clay and the mixture of limestone and calcined clay on the hydration of cement. Both limestone and calcined clay accelerate the hydration reaction in the early hydration age and enhance the properties of cement. Limestone reacts with C3A to form carboaluminate, which indirectly stabilized the presence of ettringite, while calcined clay consumed portlandite to form C-(A)-S-H gel, additional hydration products promote the densification of pore structure and increase the mechanical properties. The synergistic effect of calcined clay and limestone stabilize the existence of ettringite and stimulate the further formation of carboaluminate, as well as the C-(A)-S-H gel, contributed to a dense microstructure.

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Durability And Microstructure of Pore Reduced Cements(PRC)

MRS Proceedings ◽

10.1557/proc-370-237 ◽

1994 ◽

Vol 370 ◽

Cited By ~ 4

Author(s):

N.M. Geslin ◽

D. Israel ◽

E.E. Lachowski ◽

D.E. Macphee

Keyword(s):

Mechanical Properties ◽

Pore Structure ◽

Cementitious Materials ◽

Product Density ◽

Structure Characteristics ◽

Pore Properties ◽

Durability Performance

AbstractThe pore structure characteristics of cementitious materials play an important role in defining their mechanical and durability performance. The mechanical properties of pore reduced cements (PRC) have already been reported [5] as a function of the product density. This paper reports recent data on the durability of PRC and attempts to relate the pore properties of the material to its resistance against deterioration in aggressive environments.

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Mechanical Properties and Microstructure Analysis of Copper Tailings Solidifying with Different Cementitious Materials

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.878.171 ◽

2014 ◽

Vol 878 ◽

pp. 171-176 ◽

Cited By ~ 1

Author(s):

Xu Quan Huang ◽

Hao Bo Hou ◽

Min Zhou ◽

Wei Xin Wang

Keyword(s):

Mechanical Properties ◽

Blast Furnace ◽

Blast Furnace Slag ◽

Calcium Silicate Hydrate ◽

Steel Slag ◽

Cementitious Materials ◽

Cementitious Material ◽

Hydration Products ◽

New Type ◽

Furnace Slag

With new type steel slag-blast furnace slag-fluorgypsum-based cemented material, P O42.5 cement, commonly used cementation agent in China, mechanical properties and microstructure of tailings solidification bodies are studied. The hydration products and morphology tailings concretion body in 60 days are analyzed by SEM and XRD test, which reveals the tailings cementation mechanism solidifying with different cementitious material. Furthermore, a large number of slender bar-like ettringite crystals and filamentous network-like calcium-silicate-hydrate gels bond firmly each other, which is the most important reason why steel slag-blast furnace slag-fluorgypsum base cemented material has the best tailings cementation mechanical properties.

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Temperature Field Simulation of Wood Powder/PES Composite Powder Material

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.667.218 ◽

2015 ◽

Vol 667 ◽

pp. 218-223

Author(s):

Yue Qiang Yu ◽

Yan Ling Guo ◽

Kai Yi Jiang

Keyword(s):

Temperature Field ◽

Heat Source ◽

Powder Material ◽

Laser Power ◽

Composite Powder ◽

Selective Laser Sintering ◽

Laser Sintering ◽

Powder Materials ◽

Wood Powder ◽

Composite Powder Material

In view of the physical process of the wood powder/PES composite powder material selective laser sintering forming ,this article establishes the plane moving Gaussian heat source as the input laser heat source model .Based on selective laser sintering wood powder/PES composite powder sintering theory and combined with thermal conductivity of composite powder, specific heat, density and other related theoretical analytical models .It establishes three dimensional finite element model of selective laser sintering process of wood powder/PES composite powder transient temperature field .The laser sintering simulation experiment of wood powder/PES composite powder under different laser power obtains temperature field distribution law of the wood powder/PES composite powder forming under different laser power distribution, and the influence of the forming parts forming quality of wood powder/PES composite powder materials caused by the temperature field. The simulation results also provide certain theoretical basis for the choice of laser power in the subsequent laser sintering experiment.

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EVALUATION OF THE IMPROVEMENT RP POWDER STEREO-SHAPED TECHNIQUES TO DIRECTLY SOLIDIFIED MODELING OF BIOCHEMISTRY COMPOSITE POWDER MATERIAL

Biomedical Engineering Applications Basis and Communications ◽

10.4015/s1016237206000312 ◽

2006 ◽

Vol 18 (04) ◽

pp. 198-201 ◽

Cited By ~ 1

Author(s):

SHUH-PING SUN ◽

YI-JIUN CHOU ◽

W. L. YAO ◽

YU-FU CHEN

Keyword(s):

Rapid Prototyping ◽

Bone Graft ◽

Powder Material ◽

Composite Powder ◽

Powder Materials ◽

Graft Material ◽

Bone Graft Material ◽

Composite Powder Material ◽

Bone Filling

This study apply the RP powder stereo-shaped techniques and using standard biochemistry materials to discuss how biochemistry composite powder material can directly be solidified by using rapid prototyping machines to become bone-filling graft for missing bone on clinical surgery. As for the materials of implants, the research using commercialized composite powder materials. Concerning the making of bone filling model, this study uses 3D Anthropometrics bone image and using the related images editing system to simulate the curve shape of bone filling graft. Then cooperate the characteristic of the rapid prototyping machine (Zcorp 402 3DP), solidify directly without mold, with the commercialized biochemistry bone graft material, it can directly accomplish bone filling graft in the light of patients' demand in the fist place. The forming structure of the rapid prototyping machine is the bone filling piled up by the stratification piling method; it's different from the hand-made pressure forming. According to the modification of the RP equipment, which the research is used, can be upgrade the solidification quality of bone graft material.

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Deterioration of the Anti-Frost Performance of Concrete with Construction Waste Composite Powder Materials

Emerging Materials Research ◽

10.1680/jemmr.19.00141 ◽

2020 ◽

Vol 9 (2) ◽

pp. 1-14

Author(s):

Cuizhen Xue ◽

Junping Ren ◽

Xiangchen Zhu ◽

Aiqin Shen

Keyword(s):

Composite Powder ◽

Powder Materials ◽

Construction Waste

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A Systematic Study on Polymer-Modified Alkali-Activated Slag–Part II: From Hydration to Mechanical Properties

Materials ◽

10.3390/ma13153418 ◽

2020 ◽

Vol 13 (15) ◽

pp. 3418 ◽

Cited By ~ 1

Author(s):

Zichen Lu ◽

Jan-Philip Merkl ◽

Maxim Pulkin ◽

Rafia Firdous ◽

Steffen Wache ◽

...

Keyword(s):

Mechanical Properties ◽

Pore Structure ◽

Analytical Techniques ◽

Hydration Products ◽

Ion Diffusion ◽

X Ray Diffraction ◽

Alkali Activated Slag ◽

Activated Slag ◽

Alkali Activated ◽

Polymer Latex

The effect of styrene-acrylate (SA) polymer latex on alkali-activated slag (AAS) was systematically studied in the aspects of hydration, hydration products, pore structure and mechanical properties through the combined analytical techniques including calorimetry, X-ray diffraction, thermogravimetric analysis, mercury intrusion porosimetry, and mechanical measurement. It was found that the addition of SA does not retard the AAS hydration, but slightly accelerates it, possibly due to the increasing ion diffusion through the loosely structured hydration products. Pore structure analysis indicates that the addition of polymer increases the cumulative pore volume and the portion of pores with size >100 nm in the hardened AAS paste. The addition of SA latex results in a continuous decrease of the compressive strength, but the flexural strength firstly increases and then decreases with the increase of polymer dosage. The polymer dosage of 2.5 wt % is optimal when applying polymer latex in the AAS system in this study.

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