The influence of initial water curing on the strength development of ordinary portland and pozzolanic cement concretes

2004 ◽  
Vol 34 (1) ◽  
pp. 13-18 ◽  
Author(s):  
Baris Ozer ◽  
M.Hulusi Ozkul
Keyword(s):  
Strength Development ◽  
Initial Water ◽  
Water Curing ◽  
Pozzolanic Cement

PROPERTIES OF MORTAR CONTAINING CERAMIC POWDER WASTE AS CEMENT REPLACEMENT

2015 ◽  
Vol 77 (12) ◽  
Author(s):  
Mostafa Samadi ◽  
Mohd Warid Hussin ◽  
Han Seung Lee ◽  
Abdul Rahman Mohd Sam ◽  
Mohamed A. Ismail ◽  
...  
Keyword(s):  
Construction Industry ◽  
Ceramic Powder ◽  
Ceramic Materials ◽  
Strength Properties ◽  
Strength Development ◽  
X Ray Diffraction ◽  
Cement Replacement ◽  
Water Curing ◽  
Field Emission Electron Microscopy ◽  
Curing Regime

Ceramic materials are largely used in all over the world and consequently, large quantities of wastes are produced simultaneously by tile manufacturers and construction industry. Nevertheless, part of these wastes and those produced by the construction industry are dumped in landfills. This paper presents the effect of using ceramic waste in mortar as cement replacement. Four mortar mixes were prepared in this study and focuses on the effect of ceramic powder as cement replacement on the strength development and the morphology of the mortar. The microstructural characteristics of the mortar were investigated by scanning field emission electron microscopy (FESEM) and the mineralogical properties was investigated using the X-ray diffraction (XRD).  The cement was replaced by ceramic powder from 0% to 60% by weight of cement. The specimens were cast in 50 x 50 x 50 mm cube and water curing regime was used until the age of testing. The fineness of ceramic powder used is less than 45µm. The developments of compressive strength were studied for all samples. It is found that the optimum replacement that gave the highest strength was 40% replacement. It was also found that the use of ceramic powder enhanced the microstructure and strength properties of the mortar.

scholarly journals Effect of micro-climate variations on carbonation rate of concrete in the inland environment

2019 ◽  
Vol 289 ◽  
pp. 02001
Author(s):  
Yunusa Aminu Alhassan ◽  
Sunday Apeh
Keyword(s):  
Carbon Dioxide ◽  
Reinforced Concrete ◽  
Atmospheric Carbon Dioxide ◽  
Vehicular Traffic ◽  
Reinforcement Corrosion ◽  
Climate Variations ◽  
Initial Water ◽  
Exposure Site ◽  
Water Curing ◽  
Corrosion Of Steel

In an inland environment, carbonation is the primary cause of initiation for potential corrosion of steel in reinforced concrete. This problem has been exacerbated over recent years by increased urbanisation and vehicular traffic, resulting in higher atmospheric carbon dioxide contents – a problem typical of economically active cities throughout the world. It is important that designers of reinforced concrete structures respond to these variations through appropriate specifications to ensure that structures perform satisfactorily over their intended service lives. This paper is part of a study undertaken to assess the carbonation of concretes exposed to a range of micro-climate variations in inland environments, particularly with variations in carbon dioxide content, temperature and relative humidity conditions with the intent of developing a prediction model for the rate of carbonation. Concretes samples were prepared using three binder types representing variations of blends with FA, GGBS and four w/b ratios ranging from 0.4 to 0.75 and subjected to different degrees of initial water curing (3, 7, 28 days). These samples were placed in three exposure conditions: indoors in laboratory air, outdoors sheltered from rain and sun and outdoors fully exposed to the elements. The depths of carbonation of these samples were monitored over a period of 24 months in order to determine the rates of carbonation. Concrete samples in the outdoor sheltered sites presented the highest rate of carbonation. Although samples in this exposure site carbonated faster, the risk of reinforcement corrosion is likely to be low because the samples are protected from direct moisture effect. Keywords: Carbonation, Corrosion, Reinforced concrete, Micro climate, Inland environments

Effect of Ceramic Powder on Mortar Concrete

2015 ◽  
Vol 1113 ◽  
pp. 62-67 ◽  
Author(s):  
Mostafa Samadi ◽  
Mohd Warid Hussin ◽  
Abdul Rahman Mohd Sam ◽  
Hasanah Shukor Lim
Keyword(s):  
Ceramic Powder ◽  
Strength Development ◽  
Ceramic Tiles ◽  
Cement Replacement ◽  
Material Supply ◽  
The World ◽  
Water Curing ◽  
Curing Regime ◽  
Pozzolanic Properties ◽  
Growing Population

The growing population of the world resulting in the demand for shelter and infrastructure, consequently increasing the use of natural resources that can cause problem to the environment and material supply. Ceramic tiles are a waste material that has been studied and shown to have pozzolanic properties. This study focuses on the effect of finer ceramic waste as cement replacement on the compressive strength, strength development and flowability of the mortar. The cement was replaced by ceramic powder from 10% to 40% by weight of cement. The specimens were cast in 50x50x50mm cubes and water curing regime was used until the age of testing. The results of 20% replacement show that finer ceramic powder has the potential to be used as cement replacement material.

Effect of Curing Method on the Strength Development and Freezing-Thawing Durability of the Concrete Incorporating High Volume Blast-Furnace Slag Subjected to Initial Frost Damage

2012 ◽  
Vol 602-604 ◽  
pp. 962-967 ◽  
Author(s):  
Kyung Taek Koh ◽  
Gum Sung Ryu ◽  
Jang Hwa Lee
Keyword(s):  
Blast Furnace Slag ◽  
High Volume ◽  
Frost Damage ◽  
Strength Development ◽  
Term Strength ◽  
Water Curing ◽  
Early Strength ◽  
Curing Method ◽  
Furnace Slag

In the case of construction with high volume blast-furnace slag(BFS) concrete during winter season, the setting and hardening are drastically delayed, so it has a high risk of initial frost. Assuming that the concrete incorporating a high volume of BFS is affected by freezing at the early age during the winter conditions, then this study is to investigate the effect of curing method on the strength development and the resistance to freezing-thawing action. As a result, the concrete performing water curing at 5°C after subjected to initial frost damage improve the long-term strength and the freezing-thawing durability. The concrete implementing water curing at 30°C enhance the long-term strength and the resistance to freezing-thawing action as well as the early strength. However, the concrete with sealed curing at 30°C exhibits the improvement in the early strength, but not in the long-term strength and the freezing-thawing durability.

Investigation of Workability and Compressive Strength of Wood Ash Cement Concrete Containing Nanosilica

2019 ◽  
Vol 1154 ◽  
pp. 129-136
Author(s):  
Akeem A. Raheem ◽  
Bolanle Deborah Ikotun
Keyword(s):  
Compressive Strength ◽  
Waste Product ◽  
Wood Ash ◽  
Biological Synthesis ◽  
Strength Development ◽  
Cement Concrete ◽  
Mix Proportion ◽  
Binder Ratio ◽  
Early Strength ◽  
Pozzolanic Cement

Studies have revealed that wood ash cement concrete just like other pozzolanic cement concrete has lower early strength compared to plain cement concrete. Nanoparticles have been found to improve the early strength of concrete due to its small size and large surface area. This paper reports the findings on influence of nanosilica on the workability and compressive strength of wood ash cement concrete. Wood ash was obtained as a waste product from Ladoke Akintola University of Technology (LAUTECH) bread bakery, Ogbomoso. Biological synthesis of nanosilica using kola pod extract and silica precursor (1:5) was conducted at Nanotechnology research group laboratory at LAUTECH. The chemical composition, specific gravity and grading of wood ash, fine and coarse aggregate used were determined. Concrete with 10% wood ash replacement for cement was produced using 1:2:4 mix proportion and water to binder ratio of 0.5. Nanosilica was added at 0.5, 1.0, 1.5 and 2.0% levels. Concrete with no wood ash and nanosilica served as the control. Workability and compressive strength of the plain and composite concrete were determined. The results showed that concrete workability was enhanced with introduction of nanosilica. The compressive strength also increased with the addition of nanosilica. Maximum compressive strength of 27.53MPa was achieved at 90 days with 1.5% nanosilica addition. It was concluded that nanosilica enhanced workability and improved both early and later strength development in wood ash concrete with 1.5% as the optimum addition.

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