scholarly journals Lime Treatment of Wastewater from Tunnel Construction Using Water Glass and Portland Cement for Groutinig

1990 ◽  
Vol 13 (3) ◽  
pp. 163-172,161
Author(s):  
Toshiro MARUYAMA ◽  
Masaki MIYANE ◽  
Ryoichi YAMADA ◽  
Fumio TAKASHIMA
Keyword(s):  
Portland Cement ◽  
Water Glass ◽  
Tunnel Construction ◽  
Lime Treatment

scholarly journals Effect of Ordinary Portland Cement and Water Glass on the Properties of Alkali Activated Fly Ash Concrete

Minerals ◽  
2019 ◽  
Vol 10 (1) ◽  
pp. 40 ◽  
Author(s):  
Vytautas Bocullo ◽  
Danutė Vaičiukynienė ◽  
Ramūnas Gečys ◽  
Mindaugas Daukšys
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Portland Cement ◽  
Water Glass ◽  
Ordinary Portland Cement ◽  
Reference Sample ◽  
Freeze And Thaw ◽  
Naoh Solution ◽  
Increased Strength ◽  
Alkali Activated

This research presents the influence of ordinary Portland cement (OPC) and/or water glass addition on fly ash alkali-activated mortar and concrete. The results show that fly ash (FA) concrete activated with a NaOH solution and water glass mixture had better resistance to freeze and thaw, carbonation, alkali-silica reaction (ASR) and developed higher compressive strength and static elastic modulus compared with the FA concrete activated only with an NaOH solution. The addition of OPC contributes to the development of a denser microstructure of alkali activated concrete (AAC) samples. In the presence of water glass and OPC, the compressive strength (52.60 MPa) of the samples increased more than two times as compared with the reference sample (21.36 MPa) without OPC and water glass. The combination of OPC and water glass showed the increased strength and enhanced durability of AAC. The samples were more resistant to freeze and thaw, ASR, and carbonation.

Reuse of sewage sludge as raw material of Portland cement in Japan

2002 ◽  
Vol 46 (10) ◽  
pp. 255-258 ◽  
Author(s):  
T. Taruya ◽  
N. Okuno ◽  
K. Kanaya
Keyword(s):  
Sewage Sludge ◽  
Portland Cement ◽  
Raw Material ◽  
Lime Treatment ◽  
Potential Alternative ◽  
Selection Of

A potential alternative of sewage sludge reuse is the substitute of raw material for Portland cement. This paper overviews Japanese implementation of this and discusses the best selection of pretreatment for this purpose. The pretreatment includes dewatering, incineration, and lime treatment.

Strength Enhancement of Geopolymer-Based Concretes by Mixed Alkaline Activators

2010 ◽  
Vol 658 ◽  
pp. 292-295 ◽  
Author(s):  
Z. X. Yang ◽  
Kyu Hong Hwang ◽  
M.C. Kim ◽  
J.Y. Yang ◽  
S.K. Lim
Keyword(s):  
Fly Ash ◽  
Portland Cement ◽  
Co2 Emission ◽  
Water Glass ◽  
Bending Strength ◽  
Construction Material ◽  
Recycled Concrete ◽  
Geopolymer Concrete ◽  
New Material ◽  
Main Components

As a relatively new material, geopolymer concrete offers benefits as a construction material for sustainable development. It utilizes waste materials such as recycled concrete sludge, fly ash,etc. To reduce CO2 emission, geopolymer concrete is expected to replace the traditional Portland cement based concrete. It’s reported that geopolymer based concrete releases only 1/6 CO2 compared to those of based Ordinary Portland Cement (OPC). In this study, to obtain a new type of construction material with lower CO2 emission and energy consumption, fly ash, waste concrete sludge and metakaolin were used as the main components. Solution of NaOH/KOH and water glass were applied as alkaline activator. The amount of water glass and the ratio of alkaline/water glass were varied to reach an optimal value. Also, silica fume was added as a bonding matrix to enhance the strength, and the specimens were cured in air and oven, then their mechanical properties such as compressive strength and bending strength were measured and their microstructures were investigated.

scholarly journals Influence of Water Glass Introduction Methods on Selected Properties of Portland Cement

Materials ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3257
Author(s):  
Wiktor Szewczenko ◽  
Galyna Kotsay
Keyword(s):  
Portland Cement ◽  
Cement Paste ◽  
Water Glass ◽  
Setting Time ◽  
Solid States ◽  
Effect Of Water ◽  
Modelling Method ◽  
Influence Of Water ◽  
Mixing Water

This article presents a study of the effect of water glass and its introduction on the hydration of Portland cement and its properties in plastic and solid states. The introduction of sodium water glass into the mixing water extends the setting time of Portland cement by 35%, while introduction into the cement paste reduces it by 24.4%; for potassium water glass, the respective values are 10.8% and 10.8%. The introduction of sodium water glass into the mixing water decreases its consistency by 17.6%; its introduction into the cement paste reduces its consistency by 97%. Based on microcalorimetric studies and using the modelling method, mechanisms of the processes occurring in the cement paste, for various methods of introducing water glass admixtures, and their influence on the properties of cement are proposed. The important implications of the obtained results are that, using various methods for introducing admixtures of water glass, it is possible to regulate the setting of cement slurries within significant limits that are important during their transportation.

scholarly journals Effect of Water Glass on Early Hardening of Portland Cement

2017 ◽  
Vol 172 ◽  
pp. 977-981 ◽  
Author(s):  
Shevchenko Viktor ◽  
Kotsay Galyna
Keyword(s):  
Portland Cement ◽  
Water Glass ◽  
Effect Of Water

Research on Durability Performance of Novel Double Solution Grouting Material with Metakaolin

2011 ◽  
Vol 250-253 ◽  
pp. 722-727 ◽  
Author(s):  
Chao Yan ◽  
Qing Jun Ding ◽  
Jian Ping Xu ◽  
Hong Xi Wang
Keyword(s):  
Corrosion Resistance ◽  
Portland Cement ◽  
Water Glass ◽  
Structural Model ◽  
Gelation Time ◽  
Aqueous Dispersion ◽  
Cementitious Materials ◽  
Grouting Material ◽  
Grouting Materials ◽  
Resistance Performance

At the present, Portland cement-water glass double solution grouting materials have many problems, such as the instability of gelation time and of products, and poor groundwater-corrosion resistance performance, etc. A way to improve the performances of double solution grouting materials was studied by adding metakaolin into the systems. Based on the rapid gelation performance of Portland cement-water glass and the durability of alkali-activated salic cementitious materials, an ideal structural model of the novel anti-aqueous dispersion and anti-aqueous dissolution grouting material (AAGM) was established. Series of experiments were prepared to verify the Na+ solidification and water-corrosion resistance performance of the metakaolin-water glass double solution grouting materials which combined with cement. The results indicated that the compact structure of AAGM was composed of a dominant ingredient of (Na,Ca)-Si-Al-H zeolite gel and a minor part of C-S-H. Moreover, it was shown that the AAGM had hydrated product of low solubility and compact microstructure tested by Fourier transform infrared spectra (FTIR) and transmission electron microscopy (SEM), which proved the well anti-aqueous dispersion and anti-aqueous dissolution performance.

scholarly journals Application of expanding cements for sprayed concrete in tunnel construction

Vestnik MGSU ◽  
2019 ◽  
pp. 1438-1448
Author(s):  
Alexey I. Kharchenko ◽  
Igor Ya. Kharchenko ◽  
Vyacheslav A. Alekseev ◽  
Sofia I. Bazhenova
Keyword(s):  
Portland Cement ◽  
Active Agent ◽  
General Mechanism ◽  
Tunnel Construction ◽  
Underground Structures ◽  
Volume Deformation ◽  
Sprayed Concrete ◽  
Construction Tasks ◽  
Physicochemical Methods ◽  
And Performance

Introduction. The paper substantiates the actuality of the problem connected with obtaining efficient fine concretes possessing enhanced crack resistance, tightness, and duration for tunnel construction. This aim is pursued with the application of expansive cements (EC). Materials and methods. Various types of expansive agents were used in composition binders. Portland cement PTs 500 D0 was taken as the basic Portland cement. Studying hydration and structure formation processes during hardening of the ECs and EC-based concretes was executed utilizing a system of physicochemical methods. Assessment of construction and technical properties of the fine concretes based on composition binders was accomplished using standard research methods. Results. Analysis results are given for the effect of type and amount of the expansive agents on strength and volume deformation values of the concretes used in tunnel installation construction. Improvement of physical, mechanical, and technological properties and performance of sprayed concrete is shown. A general mechanism of influence of expansive additives (EA) on fine concrete properties is established. A classification of expansive cements for solving various tasks in tunnel installation construction is suggested. Conclusions. EA application efficiency is theoretically substantiated and experimentally proved for the case when the EA is used as an active agent in the composition binder for sprayed concrete in tunnel construction. General enhancement of technical indicators of concrete mixture and concretes is determined. EA classification is suggested for the different extent of hydrated EA expansion and various construction tasks. Replacement of standard Portland cement for an EC for underground structures concrete used in tunnel construction provides a significant increase in their maintainability.

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