Study on Slag-Based Geopolymer Hydration Process

2011 ◽  
Vol 477 ◽  
pp. 67-71 ◽  
Author(s):  
Qing Wang ◽  
Zhao Yang Ding ◽  
J. Zhang ◽  
L.G. Qiu ◽  
Zhi Tong Sui
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Ph Value ◽  
Cementitious Material ◽  
Raw Material ◽  
Early Age ◽  
Oxide Content ◽  
Environment Friendly ◽  
Volume Stability ◽  
Geopolymer Paste

As environment-friendly or green cement, the geopolymer cementitious material has high early age strength, good volume stability and durability. In this paper, the mechanical properties of geopolymer hydrates at different hydrating ages were studied by changing the oxide content of raw material. The results showed that the chemical-combined water kept increasing as hydrating age prolonged, and reached the maximum at n(SiO2)/n(Al2O3)=3.9, n(H2O)/n(SiO2)=2.3 and n(Na2O)/n(Al2O3)=0.6. With the development of hydration, the pH value of geopolymer paste showed fluctuated: pH value kept increased at the age of 1d～3d, then decreased at the age of 3d～7d, at the age of 7d～14d the pH value increased again and at last it remained constant at the age of 14d～28d. 28d compressive strength of geopolymer paste reached the maximum as chemical-combined water content was 0.09g～0.10g and pH value was 10～11.

scholarly journals Enhancing the mechanical properties and cytocompatibility of magnesium potassium phosphate cement by incorporating oxygen-carboxymethyl chitosan

2020 ◽  
Author(s):  
Changtian Gong ◽  
Shuo Fang ◽  
Kezhou Xia ◽  
Jingteng Chen ◽  
Liangyu Guo ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Physicochemical Properties ◽  
Bone Cement ◽  
Ph Value ◽  
Setting Time ◽  
Potassium Phosphate ◽  
Carboxymethyl Chitosan ◽  
Bioactive Substances ◽  
Magnesium Potassium Phosphate Cement

Abstract Incorporating bioactive substances into synthetic bioceramic scaffolds is challenging. In this work, oxygen-carboxymethyl chitosan (O-CMC), a natural biopolymer that is nontoxic, biodegradable and biocompatible, was introduced into magnesium potassium phosphate cement (K-struvite) to enhance its mechanical properties and cytocompatibility. This study aimed to develop O-CMC/magnesium potassium phosphate composite bone cement (OMPC), thereby combining the optimum bioactivity of O-CMC with the extraordinary self-setting properties and mechanical intensity of the K-struvite. Our results indicated that O-CMC incorporation increased the compressive strength and setting time of K-struvite and decreased its porosity and pH value. Furthermore, OMPC scaffolds remarkably improved the proliferation, adhesion and osteogenesis related differentiation of MC3T3-E1 cells. Therefore, O-CMC introduced suitable physicochemical properties to K-struvite and enhanced its cytocompatibility for use in bone regeneration.

scholarly journals A Novel Approach to Fabricate Foam Ceramics from Steel Slag

2020 ◽  
Vol 2020 ◽  
pp. 1-7
Author(s):  
Yu Zheng ◽  
Xudong Luo ◽  
Jinlong Yang ◽  
Wenlong Huo ◽  
Chi Kang
Keyword(s):  
Compressive Strength ◽  
Ph Value ◽  
Steel Slag ◽  
Raw Material ◽  
Solid Loading ◽  
Insulation Material ◽  
Ceramic Foams ◽  
Novel Approach ◽  
The Stability ◽  
First Time

A novel approach is used for fabricating steel slag foam ceramics based on the particle-stabilized foaming method. In this work, steel slag was used as the raw material and propyl gallate (PG) was used as the surface modifier. For the first time, steel slag ceramic foams were successfully fabricated based on particle-stabilized foams. The results show that the stability of the ceramic foams was closely related to the pH value and PG concentration. The porosity and compressive strength could be controlled by changing the solid loading of steel slag and sintering temperature. The porosity of steel slag foam ceramics ranged from 85.6% to 62.53%, and the compressive strength was from 1.74 MPa to 10.42 MPa. The thermal conductivity of steel slag foam ceramics was only 0.067 W (m·K)−1, which shows that it could be used as a thermal insulation material.

Effect of Fly Ash and Activator on Performance of Steam-Cured Concrete

2010 ◽  
Vol 113-116 ◽  
pp. 1013-1016 ◽  
Author(s):  
Zhi Min He ◽  
You Jun Xie ◽  
Guang Cheng Long ◽  
Jun Zhe Liu
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Compressive Strength ◽  
Fly Ash ◽  
Precast Concrete ◽  
Early Age ◽  
Flexure Strength ◽  
Concrete Elements ◽  
Chemical Activator

In precast concrete elements manufacturing, steam-cured concrete incorporating 30% fly ash encountered the problem of a too low demoulding compressive strength. To resolve it, this paper developed a new steam-cured concrete (AFSC) incorporating fly ash and a chemical activator. Experiments were conducted to investigate the mechanical properties of AFSC. The corresponding mechanism was also discussed by testing the microstructure of concrete. Results indicate that the demoulding compressive strength of AFSC can meet production requirements, and compressive and flexure strength of AFSC at later ages increase well. Compared with that of ordinary steam-cured concrete, AFSC has a higher tensile strength, and the capability of AFSC to resist cracks is enhanced remarkably. At an early age, addition of the chemical activator can distinctly accelerate the extent of hydration of the fly ash cement systems, and thus the microstructure of concrete becomes denser.

Study on CO2 Sequestration Property of Cement Based Composite Cementitious Materials Containing Steel Slag Used in Road

2011 ◽  
Vol 311-313 ◽  
pp. 1949-1952 ◽  
Author(s):  
Ying Li Gao ◽  
Ling Cheng
Keyword(s):  
Mechanical Properties ◽  
Growth Rate ◽  
Compressive Strength ◽  
Mass Fraction ◽  
Carbon Emission ◽  
Steel Slag ◽  
Cementitious Materials ◽  
Current Situation ◽  
Cementitious Material

Cement based composite cementitious material containing steel slag used in road has been prepared to deal with the current situation that the transportation carbon emission increased year by year. In this material, 40% cement has been replaced by equivalent steel slag, which has the ability of CO2sequestration. This paper studied the CO2sequestration effect and the mechanical properties of the pure cement, the pure steel slag, and the cement based composite cementitious materials containing steel slag. It has been shown that the cement based composite cementitious materials containing steel slag have excellent CO2sequestration property. The mass fraction growth rate of carbon reached 10.86% after 1 hour carbonation experiment, the value between which of pure cement and pure steel slag, and the compressive strength of the composite cementitious materials at 28-day age can reach 45.3MPa, meeting the requirements of road.

Experimental Research on Mechanical Properties of the early-Age Shotcrete

2011 ◽  
Vol 90-93 ◽  
pp. 2188-2192
Author(s):  
Nan Xie ◽  
Jie Ouyang ◽  
Bing Li ◽  
Jing Hui Lu
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Elastic Modulus ◽  
Experimental Research ◽  
Early Age ◽  
Construction Sites ◽  
Exponential Relationship ◽  
Construction Period ◽  
Ordinary Concrete ◽  
Under Construction

Abstract. The compressive strength and elastic modulus of early-age shotcrete have important influence on the safety of tunnel during construction period. In order to investigate the laws of the mechanical properties of early-age shotcrete, experiments on the compressive strength and elastic modulus of early-age shotcrete with two different mixes used frequently on construction sites were carried out. The results show that the compressive strength and elastic modulus of shotcrete develop fairly rapidly and especially the development of elastic modulus of shotcrete is faster than that of ordinary concrete. There is an exponential relationship between the compressive strength and time as well as the elastic modulus development and time. Simultaneously their formulas were derived. The research results of this paper are not only helpful to understand the laws of the mechanical properties of early-age shotcrete, but also provide some reference for the reliability analysis of tunnel under construction.

The Experimental Study on Performance of the High-Content Slag Cementitious Materials

2013 ◽  
Vol 634-638 ◽  
pp. 311-316
Author(s):  
Ping Yang ◽  
Zhi Gui Qin ◽  
Wei Xia Zhao ◽  
Xi Nan Cai ◽  
Xiao Lin Yuang
Keyword(s):  
Experimental Study ◽  
Compressive Strength ◽  
Mass Production ◽  
Cementitious Materials ◽  
Cementitious Material ◽  
Hydration Heat ◽  
Raw Material ◽  
Heat Temperature ◽  
Economic Profit ◽  
Easy Operation

The research adopts the raw material of 89% slag with the composite activators and the compressive strength, hydration heat, temperature and expansion property of the material are studied. And the new cementitious material is obtained with the properties of low-heat and small expansion, convenience-confect, easy-operation and need no mass production. This material has the remarkable economic profit and good application foreground especially in the mass grouting engineering.

scholarly journals Effect of adding waste boulder powder on mechanical properties of green concrete

2021 ◽  
Vol 293 ◽  
pp. 02033
Author(s):  
Xiaohui Li
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Elastic Modulus ◽  
Resource Utilization ◽  
Sand Production ◽  
Environment Friendly ◽  
Rock Powder ◽  
Green Concrete ◽  
Manufactured Sand ◽  
Powder Content

Reusing of stone powder formed in the production of manufactured sand is of great significance to environmental protection and resource utilization. In this paper, C30 and C40 environment-friendly manufactured sand concrete were prepared by adding 6%, 9%, 12% and 15% of waste boulder powder from manufactured sand production line into concrete and controlling the total weight of manufactured sand and rock powder to be constant. The influence of stone powder on concrete fluidity, compressive strength and elastic modulus were analysed. It was found that with the increase of stone powder content, the compressive strength of fresh paste and C30 concrete first increased and then decreased, while the elastic modulus of concrete and the compressive strength of C40 concrete continued to decrease. It is suggested that the content of rock powder should not exceed 9%.

scholarly journals THE CONSTRUCTION OF A COMPOSITION BASED ON MAGNESIA BINDER WITH PEAT

Vestnik MGSU ◽  
2017 ◽  
pp. 642-646
Author(s):  
Natalia Shamilievna Lebedeva ◽  
Evgeniy Gennadievich Nedayvodin
Keyword(s):  
Mechanical Properties ◽  
Aqueous Solution ◽  
Compressive Strength ◽  
Building Material ◽  
Construction Material ◽  
Raw Material ◽  
Sound Insulation ◽  
Structural Purpose ◽  
Different Content ◽  
Good Heat

Obtained building material based on magnesia binder with different content of peat (0 to 90 %), on a specially developed technique. As a binder used PMK 87, for mixing mixtures used aqueous solution of magnesium chloride and peat from the Ivanovo region. It were determined such physical and physico-mechanical properties of the investigated material as the compressive strength and the density. The strength characteristics of silicate bricks, ceramic bricks and the investigated material based on magnesia binder and peat was analyzed and compared. It is established that the samples of construction material with content of peat not exceeding 40 wt.% can be attributed to the materials of structural purpose by its compressive strength. Samples of the material with content of the peat 40% have a density 943,75 kg/m3, that provides good heat and sound insulation properties. It is revealed that the solution of the raw material mixture of magnesia binder, peat, the solution of bischofite is optimized to place, and the material gets at least 85% of its strength during 30 days.

Synthesis and Characteristics of Inorganic Polymer Materials Geopolymerized from Ash of Brickyard

2019 ◽  
Vol 961 ◽  
pp. 45-50 ◽  
Author(s):  
Hoc Thang Nguyen
Keyword(s):  
Compressive Strength ◽  
Water Absorption ◽  
Sodium Hydroxide ◽  
Sodium Hydroxide Solution ◽  
Raw Material ◽  
Polymer Materials ◽  
Inorganic Polymer ◽  
High Porosity ◽  
Hydroxide Solution ◽  
Geopolymer Paste

Inorganic polymer materials known as geopolymer-based materials are always interesting topics for researchers. Geopolymer is environmentally friendly material which has been potential applications for many different fields such as technical materials, building materials, insolation or refractories, and others. This study used ash of brickyard (AB) as a raw material for geopolymerization process to develop novel materials with high porosity. AB is industrial waste of the brick factories that need to be managed to reduce their negative impact to the environment. AB contains high alumino-silicate resources were mixed with sodium hydroxide solution for 10 minutes to obtain the geopolymer pastes. Sodium hydroxide solution was used as an alkaline activator to form geopolymer paste. The geopolymer paste was filled into 5-cm cube molds according to ASTM C109/C109M 99, and then cured at room temperature for 28 days. These products were then tested for compressive strength, volumetric weight, and water absorption. Results indicated that the material can be considered lightweight with a compressive strength at 28 days that are in the range of 8.1 to 15.4 MPa, volumetric weight around 600kg/m3 and water absorption is under 210.65 kg/m3. The properties of geopolymer products were also determined by analytical techniques that included mineral composition by X Ray Diffraction (XRD) and microstructure by scanning electron microscope (SEM).

High-Effective Lightweight Aggregate Obtained from Glass-Containing Waste

2020 ◽  
Vol 787 (12) ◽  
pp. 66-71
Author(s):  
H.N. Mammadov ◽  
◽  
I.H. Suleymanova ◽  
B.M. Tahirov ◽  
◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Strength Class ◽  
Physical And Mechanical Properties ◽  
Lightweight Aggregate ◽  
High Strength ◽  
Raw Material ◽  
Material Base ◽  
Current Standard ◽  
Iron And Steel

The properties of high-strength artificial porous aggregate from glass-containing waste of metallurgical productions are described. The developed technology makes it possible to expand the raw material base for the production of aggregates for light concrete. Granulated slags of metallurgical productions – the main (M0>1) slags of the Novokuznetsk Iron and Steel Plant and acid (M0<1) slags of the Gorky plant are studied. According to the results of studies, it was found that the optimal swelling interval for acidic slags is 1000–1100оC, and for basic slags-1100–1150оC. A high – strength artificial porous aggregate-slag gravel with a bulk density of 340–780 kg/m3 and a compressive strength in the cylinder of 2.8–12.3 MPa was obtained. The main physical and mechanical properties of the resulting aggregate, which meets the requirements of the current standard GOST 9757–90 “Gravel, crushed stone and sand. Artificial porous”, were studied. The aggregate obtained is almost twice as strong as the known aggregate of expanded clay gravel. With the use of porous gravel and sand, light concrete of strength class B7,5–B40 and a density of 1100–1600 kg/m3 was obtained.

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