Results 31 to 40 of about 6,053,575 (214)

Mechanochemical treatment of Serbian kaolin clay to obtain high reactive pozzolana [PDF]

Journal of the Serbian Chemical Society, 2013
Mechanochemical treatment of Serbian kaolin clay was carried out in a planetary ball mill using two different milling media, hardened steel or zirconia vials and balls. The samples obtained with various milling times were characterized by the particle
Mitrović Aleksandra, Zdujić Miodrag
doaj   +1 more source

Studies about the heat of hydration developed in mortars with natural and by-product materials

Materiales de Construccion, 2000
The heat of hydration developed in reactions of mortars and concretes can be sensibly reduced using pozzolanic materials. However, the decrease of the heat of hydration is not directly proportional to the amount of cement substituted, because of the heat
M. I. Sánchez de Rojas, M. Frías, J. Rivera   +2 more
doaj   +1 more source

Study of the pozzolanic reaction kinetics in sugar cane bagasse-clay ash/calcium hydroxide system: kinetic parameters and pozzolanic activity

, 2009
This paper presents a study of the pozzolanic reaction kinetics between calcium hydroxide and a mixture of sugar cane bagasse with 20 and 30% of clay, burned at 800 and 1000 degrees C (SCBCA) by electrical conductivity measurements.
ROJAS, M. Frias, VILLAR-COCINA, E., SAVASTANO JR., H., MORALES, E. Valencia   +3 more
core   +2 more sources

Pyroprocessing and the optimum mix ratio of rice husks, broken bricks and spent bleaching earth to make pozzolanic cement

Heliyon, 2019
This paper presents the findings of an experimental investigation on optimizing pozzolanic activity of a blend of Rice Husks (RH), Spent Bleaching Earth (SBE) and Broken Bricks (BB) to form pozzolana that would have pozzolanic activity comparable to ...
Protus Nalobile, Jackson Muthengia Wachira, Joseph Karanja Thiong'o, Joseph Mwiti Marangu   +3 more
doaj   +1 more source

Tratamentos térmico e químico para remoção de óxidos alcalinos de cinzas de capim elefante

Química Nova, 2014
Elephant grass ash (EGA) was produced at 700 °C, with two different treatments: hot water (EGAhw) or acid solution (EGAas). The efficiency of the treatments at removing the potassium oxide was evaluated with the aim of using the EGA as a pozzolanic ...
Erika Y. Nakanishi, Ernesto Villar-Cociña, Sérgio F. Santos, Michelle S. Rodrigues, Pedro S. Pinto, Holmer Savastano Junior   +5 more
doaj   +1 more source

Pozzolanic activity of flint powder

Sustainable Construction Materials and Technologies (SCMT), 2019
It was tested whether powdered flint is able to reach pozzolanic properties comparable to fly ash. The flint aggregates were crushed and milled to three different grain size fractions comparable to coal fly ash. The powdered flint was characterized and subsequently used as a substitute in mortar prisms.
Osterhus, Lennart, Ditz, Florian, Schmidt-Döhl, Frank Michael   +2 more
openaire   +1 more source

Foamed Concrete Sealing Materials for Coal Seam Gas Drainage Boreholes: A Review

Safety Science and Technology, EarlyView.
This study investigates the sealing performance of foamed concrete in gas drainage boreholes. By comparing leakage pathways (a, c) with sealed systems (b, d), the research demonstrates how foamed concrete effectively fills mining‐induced fractures and resists deformation.
Jiaxing Zou, Erlei Su, Huanchun Liu, Xiangjun Chen, Lin Wang, Haidong Chen, Lin Li   +6 more
wiley   +1 more source

Sulfate Resistance of Alkali Activated Pozzolans [PDF]

International Journal of Concrete Structures and Materials, 2014
The consequence of sulfate attack on geopolymer concrete, made from an alkali activated natural pozzolan (AANP) has been studied in this paper. Changes in the compressive strength, expansion and capillary water absorption of specimens have been investigated combined with phases determination by means of X-ray diffraction.
Bondar, Dali, Lynsdale, C. J., Milestone, N. B., Hassani, N.   +3 more
openaire   +2 more sources

Investigation of the Pozzolanic Activity of Microwave Heat-Treated Kaolin

Ömer Halisdemir Üniversitesi Mühendislik Bilimleri Dergisi, 2022
Kilin puzolanik aktivitesinin arttırılması amacıyla farklı yöntemler kullanılmaktadır. Kül fırını ve döner fırınlarda yapılan kalsinasyon hem kayda değer miktarda enerji harcamakta hem de uzun süre almaktadır. Mikrodalga teknolojisi, killerin kalsinasyonu için alternatif olma potansiyeli taşımaktadır. Bu çalışmada kısa süreli mikrodalga ısıl işleminin,
GÜLTEKİN, Adil, RAMYAR, Kambiz
openaire   +2 more sources

Mechanical, rheological, and durability performances of GGBS‐based concrete for potential application to prestressed structures

Structural Concrete, EarlyView.
Abstract Ground granulated blast‐furnace slag (GGBS) is a widely used clinker substitute in concrete, recognized for its potential to significantly reduce environmental impacts. However, its application in prestressed concrete remains limited in several countries, mainly due to concerns regarding early‐age mechanical performance and long‐term ...
D. Rolando Baldiviezo, Leonardo Todisco, Cristina Argiz, Carmen Andrade, Amparo Moragues, Jaime C. Gálvez, Hugo Corres   +6 more
wiley   +1 more source