This study assessed the viability of utilizing post-processed bagasse ash (PBA) along with Class F fly ash (FA) to partially replace cement in engineered …
In this work, we introduce a novel approach for synthesizing cement-based composite sorbent materials.
DOI: 10.1016/j.conbuildmat.2023.133362 Corpus ID: 263323676; Composite cements with aqueous and semi-dry carbonated recycled concrete pastes @article{Zajc2023CompositeCW, title={Composite cements with aqueous and semi-dry carbonated recycled concrete pastes}, author={Maciej Zając and Jiayi Song and Jan …
Cracks were observed when the magnesium silicate hydrate gel cement (prepared by 40% MgO/ 60% silica fume) was dried. This drying cracking is believed to be caused when unbound water evaporates from the binder. The shrinkage upon forced drying to 200 °C of mortars made up from a reactive magnesium oxide, silica fume and sand was measured …
Both cements showed spherical pores with a bimodal distribution at the micro/nano-scale. Pores, containing a low density gel-like phase, developed through segregation of liquid during setting. ... It is evident from the above discussion that the combined use of SANS and XmCT conveyed new information on the sample …
DOI: 10.1016/S0958-9465(02)00083-5 Corpus ID: 137481607; Sulfate resistance of plain and blended cements exposed to varying concentrations of sodium sulfate @article{AlDulaijan2003SulfateRO, title={Sulfate resistance of plain and blended cements exposed to varying concentrations of sodium sulfate}, author={Salah Uthman Al-Dulaijan …
Average Joint Cure Times for PVC, ABS and CPVC Solvent Cements Pipe Diameter ½" ¾" 1" 1¼" 1½" 2" 3" 4" 6" 8" Number of Joints 325 250 150 125 90 70 50 30 10 8
While it is known that the use of low-C3A cements can provide protection against sulfate attack, the combined effect of chloride and sulfate salts on such a deterioration is highly debated and ...
Introduction. Previous research has demonstrated that reacting magnesium oxide (MgO) with silica fume (SiO 2) in the presence of sodium hexametaphosphate (Na-HMP) forms magnesium silicate hydrate gel (M-S-H) with high strength [1], [2].The pH of these cements is ~ 10 and this is significantly lower than that observed in Portland …
Cement is produced by a high-temperature (about 1500 °C) reaction in a rotary kiln of carefully proportioned and blended ratios of lime (CaO), silica (SiO 2), alumina (Al 2 O 3), and iron oxide (Fe 2 O 3).The production of cement is a chemical process requiring an accurate blend of the previously cited four key organic oxides and the …
These advances helped clarify the interfacial interactions among polymer-cement systems and attain high efficiency in producing novel polymer-cement …
Industrial production of a cement having only 50% clinker, combined with a blend of calcined clay and limestone, has proven successful through industrial trials carried out in Cuba and India. The cements produced had mechanical performance similar to a CEM I Portland cement, with clinker content above 90% [14], [15], [16]. 2. Technology ...
DOI: 10.1016/J.CONBUILDMAT.2006.05.012 Corpus ID: 136429786; Sulfate resistance of plain and blended cements exposed to wetting–drying and heating–cooling environments @article{ahmaran2007SulfateRO, title={Sulfate resistance of plain and blended cements exposed to wetting–drying and heating–cooling environments}, …
Most clinicians would be rightly hesitant about using a dental cement like zinc phosphate to lute a restoration to a flat tooth surface. However, resin cements are sometimes used for this purpose because they have greater cohesive strength and provide both micro-mechanical bonding and chemical adhesion, particularly if there is sufficient …
Cementitious materials exhibit shrinkage strain on drying, leading easily to crack formation when internally or externally restrained. It is known that cements with a slow strength gain show higher crack resistance under external drying. The ring shrinkage test can be considered an accelerated method for cracking tendency due to existing …
Applying wetting–drying cycles and raising the temperature and the concentration of solution are common methods of accelerating the tests. Hekal et al. [7] ... Blended cements prepared with both fly ash and natural pozzolan reduced the potential for the formation of ettringite due to the reduction in the quantity of calcium hydroxide and C …
Quartz cement content is often difficult to quantify using conventional petrography. Developments in equipment and technique reported here show how excellent, high-contrast images of quartz cements can be produced using combined scanning electron microscopy and cathodoluminescence (SEM/CL). In most cases quartz cement …
Fortunately, most brand of head cement sold through various fly tying supply dealers will do the job, but cheaper brands do tend to dry out faster (they thicken) and have a shorter shelf life. Most head cements are lacquer based. If they do get really thick from lack of use, add a little bit of lacquer thinner to them and shake it up well.
In saline soil or salt lake regions, cement-based materials suffer from combined action of salt attack (SA), carbonation, and cyclic wetting–drying (CWD), and its deterioration mechanism remains an open question. Taking advantage of multiple techniques, this study is dedicated to unveiling the deterioration mechanism of hardened …
Cracks were observed when the magnesium silicate hydrate gel cement (prepared by 40% MgO/ 60% silica fume) was dried. This drying cracking is believed to be caused when unbound water evaporates ...
This paper reviews the principles of shrinkage and stress development during drying of cement paste and concrete, taking particular account of the changes …
Alkali-activated concrete (AAC) is a recycled and low-CO2 alternative to ordinary portland cement (OPC) concrete. One challenge with AACs is their propensity to shrinkage and cracking. In this work, drying shrinkage of four different structural-grade AACs was studied, namely: an activated class F fly ash, an activated slag, and two …
The description of a physical property such as hydration degree or combined water can be described by means of the dispersion model, which may be defined by Eq. (3). P expresses the hydration degree (−) or combined water (g g−1 powder) at time t (h), with characteristic times at the …
To explore the physicochemical characters of barley grass, ultra-micro-crushing (UMC) technology combined with air drying or freeze drying was carried out. After barley grass was air-dried at 70°C or freeze-dried at 15°C, it was grinded for 30, 60, 90, and 120 min using UMC, respectively. After comb …
Combined microfluidics and drying processes for the continuous production of micro-/nanoparticles for drug delivery: a review. Ankit Patil a Department of Chemical Engineering, ... We have reviewed the vital role of spray and freeze-drying in nanoparticle production. In addition, we have highlighted the concept and compared a microreactor ...
Question: Match the following statements to the BEST answer from the list of choices: Is also referred to as Portland cement. Choose... It is hardened by hydration, not dying. The process by which cements combine chemically with water to harden. Choose... Aggregate Hydration Hydrated lime Hydraulic Cement Remains a dry powder.
Almost all cements are formed by the interaction of a powder capable of releasing cations into acid solution (a base) and a liquid (an acid) capable of liberation of cement-forming cations, and having acid anions that form stable complexes with those cations to yield a salt. ... although the acid components may be dried and combined …
Abstract. Rough rice was dried using several combinations of heated air drying and far-infrared radiation (FIR). The moisture diffusion coefficients were determined at various drying air temperatures ranging from 30 to 50 °C and FIR intensities ranging from zero to 2000 W m −2.The effective moisture diffusion coefficients increased with …
Cements may be used alone (i.e., "neat," as grouting materials), but the normal use is in mortar and concrete in which the cement is mixed with inert material known as aggregate.Mortar is cement mixed with sand or …
DOI: 10.1016/jpag.2023.108451 Corpus ID: 265449171; Simulation and parameter optimization of high moisture rice drying on combine harvester before threshing @article{Chen2023SimulationAP, title={Simulation and parameter optimization of high moisture rice drying on combine harvester before threshing}, author={Ping Lu Chen …
This study was conducted to evaluate the performance of plain and blended cements exposed to magnesium sulfate solutions with varying sulfate concentrations for up to 24 months. Four types of cements, namely Type I, Type V, Type I plus silica fume, and Type I plus fly ash, were exposed to five magnesium sulfate solutions with sulfate …
The IR spectra of commercial mannitol showed peaks at 1025.82, 1081.21, 1421.13 and 1637.96 cm −1 (Fig. 1).NH 4 HCO 3 has a characteristic peak at 1700 cm −1 indicating the presence of C O bond. Interestingly, samples A, B and C (Fig. 1) showed the characteristic peaks of mannitol and no peak at 1700 cm −1, indicating that NH 4 HCO 3 …
The volumetric instability of alkali-activated slag (AAS) binders has raised concerns and impeded the acceptance of this Portland cement-free material. The objective of this article is to characterize the influence of drying rate on drying shrinkage behavior of AAS mortars to better understand the mechanisms responsible for its large shrinkage …
