scholarly journals Lime-alum Treatment Method for Wastewater Discharged from Tunnel Construction Works Using Water Glass and Portland Cement for Chemical Grouting.

1992 ◽  
Vol 15 (4) ◽  
pp. 235-243
Author(s):  
Ryoichi YAMADA ◽  
Masaki MIYANE ◽  
Toshiro MARUYAMA
Keyword(s):  
Portland Cement ◽  
Water Glass ◽  
Treatment Method ◽  
Tunnel Construction ◽  
Chemical Grouting ◽  
Alum Treatment ◽  
Construction Works

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

Experiment and Practice on the Wastewater Treatment in Tunnel Construction Processing

2013 ◽  
Vol 664 ◽  
pp. 13-18
Author(s):  
Rong Gui Fan ◽  
Hui Chuan Wang ◽  
Xian Li
Keyword(s):  
Water Quality ◽  
Wastewater Treatment ◽  
Removal Efficiency ◽  
Preliminary Test ◽  
Treatment Method ◽  
Suspended Solid ◽  
Tunnel Construction ◽  
Rotational Flow ◽  
Wastewater Discharge ◽  
Sedimentation Tank

The concentration of suspended solid (SS) was confirmed as the main pollutants in wastewater from the tunnel construction processing through wastewater source and water quality in the tunnel construction processing being analyzed. The rapid wastewater treatment device was designed which combined with rotational flow sedimentation tank and flocculation reaction pool that the cement was used as flocculants. The results showed at the preliminary test that the removal efficiency of SS was above 94%. The effluent can meet the wastewater discharge standard. It was the fact that the treatment method was fast and convenient processing.

scholarly journals Analysis of Chemical Composition of Portland Cement in Ghana: A Key to Understand the Behavior of Cement

2015 ◽  
Vol 2015 ◽  
pp. 1-5 ◽  
Author(s):  
Mark Bediako ◽  
Eric Opoku Amankwah
Keyword(s):  
Chemical Composition ◽  
Portland Cement ◽  
Ordinary Portland Cement ◽  
Chemical Compositions ◽  
Test Results ◽  
Brand Name ◽  
X Ray ◽  
Portland Limestone Cement ◽  
Limestone Cement ◽  
Construction Works

The performance of Portland cement in concrete or mortar formation is very well influenced by chemical compositions among other factors. Many engineers usually have little information on the chemical compositions of cement in making decisions for the choice of commercially available Portland cement in Ghana. This work analyzed five different brands of Portland cement in Ghana, namely, Ghacem ordinary Portland cement (OPC) and Portland limestone cement (PLC), CSIR-BRRI Pozzomix, Dangote OPC, and Diamond PLC. The chemical compositions were analyzed with X-Ray Fluorescence (XRF) spectrometer. Student’st-test was used to test the significance of the variation in chemical composition between standard literature values and each of the commercial cement brands. Analysis of variance (ANOVA) was also used to establish the extent of variations between chemical compositions and brand name of the all commercial Portland cement brands. Student’st-test results showed that there were no significant differences between standard chemical composition values and that of commercial Portland cement. The ANOVA results also indicated that each brand of commercial Portland cement varies in terms of chemical composition; however, the specific brands of cement had no significant differences. The study recommended that using any brand of cement in Ghana was good for any construction works be it concrete or mortar formation.

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.

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.

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