However, if the water to cement ratio of water to cement exceeds 0.40, the effect of aggregate forms, sizes, and textures on the material's workability and strength begins to diminish [4,13, 14 ...
Cement paste specimen with a water–cement ratio of 0.5 was used in the study. After acquiring base temperature by the paste components and calorimeter, the specimens were prepared. Water (15 g) was added to cement (30 g) and mixed for 60 s by hand in a container used for calorimeter.
The novel approach of the study is implementing the installation procedure of fly ash (FA) replaced cement deep mixing (DM) columns to field cases aiming at managing FA waste and reducing cement utilization. FA replaced cement DM columns (diameter of 30 cm and length of 80 cm) were installed on clayey soils using a laboratory type DM …
Repairs and patching: White cement paste can be used to repair and patch concrete surfaces that have been damaged or worn away. It can be applied over the damaged area and smoothed to match the surrounding …
Proportioning of white concrete and mortar concerns the determi-nation of mixing ratio between water and cement, aggregates and admixtures, consistency, etc. It is …
effect of tap water, ... concrete using a 3D optical microscope revealed a large white crystalline deposit was formed that almost filled the surface of the crack. ... samples, and DM-3D Printed ...
1. Introduction. Concrete structures exposed to the atmosphere are generally facing natural carbonation. Carbonation reactions make reinforcing steels more prone to be corroded by reducing the pH of pore solution [1], and also significantly change pore structure and thus transport properties of cement-based materials [2], which are of …
The water-cement ratio is the weight of the mixing water divided by the weight of the cement. Typically, a mix is about 7% to 15% cement, 60% to 75% aggregate, and 14% to 21% water. ... it's lighter in color. Use white cement in projects that demand lighter shades of concrete. Portland-limestone cement tends to be slightly lighter-colored ...
Health effects. Cement can cause ill health by skin contact, eye contact, or inhalation. Risk of injury depends on duration and level of exposure and individual sensitivity. ... Corrosive bleed water from the concrete is …
Ceramic tiles, vitrified tiles, and marble floors may all have their gaps filled with white cement. By adding colour to the white cement, you may make the floor seem like a continuous slab of tile. After …
The sole effect of chemical aging on the water permeability of mature white cement mortars is investigated without introducing any drying action. Several remarks …
Apparent diffusion coefficients (D a) of water and activation energies (E a) of diffusion in hardened cement pastes (HCPs) were determined as a function of water …
Structural Concrete is a structural engineering journal publishing research on all aspects of concrete structures, including design, construction, demolition, and sustainability. Abstract As an eco-friendly construction material, magnesium oxychloride cement (MOC) has attracted much research interest in recent decades, however, its …
Compared to Portland cement's clinker that is dominated with Ca 3 SiO 4 (C 3 S) and Ca 2 SiO 5 (C 2 S) with slight content of other composition (e.g., Ca 3 Al 2 O 6 (C 3 A) and Ca 4 Al 2 Fe 2 O 10 (C 4 AF)), CACs depend more on the aluminum phases that have slightly higher thermal-durability resistance [27, 28, 30,31,32].Further, CACs are …
Water/cement ratio is another factor that affects the composite properties, the electrical resistance of CNT/cement composite with 0.6 water/cement ratio is more sensitive to compressive stress than that of composite with 0.45 water/cement ratio.
They were covered with a sheet of polyethylene to prevent moisture loss and were settled for approximately 1 day at room temperature. After removing the molds, HCP rods were cured for 90 days at 323 K in the cement-equilibrated water, which was prepared by mixing 2 dm 3 of deionized water with 0.2 kg of OPC powder and settling …
However, the original primer and cement chemicals (acetone, tetrahydrofuran, methyl ethyl ketone, and cyclohexanone) had a glue/varnish odour. A total of nine odorous GC peaks were produced as reaction products from leaching of primer in water and white or grey PVC pipe with primer and cement, and white or grey PVC with primer only.
A total of four different types of cements were used in this study: P·W 52.5 white cement from Aalborg Portland cement company (Anqing factory, Anhui, China); P·I 42.5 ordinary Portland cement (OPC, benchmark cement following China national standard GB8076-2008 for cement additive evaluation) from China United Cement Corporation …
Semantic Scholar extracted view of "Effects Of Water-cement Ratio On Deep Mixing Treated Expansive Clay Characteristics" by S. Pathivada. ... (DM) column in the short period following installation. Field … Expand. 88. Save. Laboratory Studies on Property Changes in Surrounding Clays Due to Installation of Deep Mixing Columns.
The grouting technique has been widely applied in geotechnical engineering. However, due to the concealed nature of underground engineering, there is relatively limited research on the diffusion characteristics of grout in sandy soil. This study utilized a self-developed three-dimensional grouting model test system. Experiments tests were …
The cement mortar lining (CML) of commonly used ductile iron pipes can severely deteriorate the drinking water quality at the initial stage of use, but the …
In order to simulate the interactions of Beishan site water (BSW) and the compacted GMZ bentonite to discover the effect of BSW on the swelling pressure, the main components of the BSW was simulated according to its mean local chemical features (Guo et al., 2010).The cement pore water solutions in different degradation stage including …
High Alumina Cement Concrete. John Wiley & Sons, Inc.: New York, 1975; 201. 31. Gilkey HJ. Water/cement ratio versus strength—another look. Journal of the American Concrete Institute, Part 2 1961; 58:1951–1978. 32. Alexander KM, Ivanusec I. Long term effects of cement SO3 content on the properties of normal and high-strength concrete, part I.
This paper presents an experimental study of the influence of steel basic oxygen slag (BOS) and ordinary portland cement (OPC) on the compressive strength and the hydration mechanisms of blended grounded granulated blast furnace slag …
The water-cement ratio is higher for white concrete than for normal concrete and is important to determine the ultimate strength of concrete. ... Mix designs for white or colored concrete are designed based on the effect of each component on the color of the concrete as follows: Pigment and type supplements. Type and color of cement.
Moreira DM, Oei J, Rawls HR, et al. A novel antimicrobial orthodontic band cement within situ-generated silver nanoparticles. Angle Orthod. 2015;85(2):175-183. doi:1 . Yi J et al, A nano-CaF2-containing orthodontic cement with antibacterial and remineralization capabilities to combat enamel white spot lesions. J Dent. 2019; …
The compressive strengths at 28 days of curing for different concrete mix proportions are presented in Table 5 (Apebo et al., 2013). Generally, the lower the water to cement ratio, the higher the ...
When the water of cement is oversaturated with soluble calcium ions, new hydration products begin to form. ... Effect of bismuth oxide on white mineral xide aggregate: chemical characterization and physical properties. Int Endod J. 2013 Sep 12; 47 (6):520–533. doi: 10.1111/iej.12181. ... Ferris DM, Baumgartner JC. Perforation repair ...
This beige-white polished concrete texture is created by mixing cement, aggregate, sand and water. The type of cement is the biggest influencing factor in the finished, set colour: Portland cement is the most commonly used, resulting in a classic, cool grey concrete, although white Portland and other cements are available as displayed here.
In this paper effect of water-cement (w/c) ratio on plastic shrinkage cracking of self-compacting concrete (SCC) is investigates. Four recipes with different w/c ratios (0.38, 0.45, 0.55 and 0.67 ...
CaF2) with gypsum, thus allowing white cement clinker with a C3A content of less than 5 wt.% to be produced, which means a sulphate-resistant white cement or a white cement resistant to seawater. In this type of material the main fluorosulphate melt contains molten White cement - properties, manufacture, prospects
WHAT IS WHITE CEMENT Cement is a powdery material which hardens when mixed with water. It serves as binder for natural and artificially processed aggregates, such as sand …
Well preserved mortars based on natural hydraulic lime are widely spread in historical buildings throughout the alpine area of Tyrol, Austria. These are frequently restored with mortars oriented on historical models. Portland cement is also commonly used to modify these materials on building sites to speed up the setting time to improve …
In view of the limitations of the excessive hydration rate and poor water resistance of magnesium phosphate cement (MPC), the effects of water purifying material waste and red mud on the mechanical properties and water resistance of MPC were studied. ... P and B were dissolved in water. M, WP, RM, and DM were then added …
Question: 7. Discuss the effect of water-cement ratio on the quality of hardened concrete. Explain why this effect happens. 8. Why isn't pozzolanic material typically used with Type III cement? 9. What is the source of fly ash? Why is fly ash sometimes added to concrete? What are the two primary classes of fly ash and their differences?
