• Mon - Sun: 24/7 online service for you
Get A QUOTE

xrd portland cement with quartz and feldspar aggregate

Transformation of meta-stable calcium silicate hydrates to tobermorite ...

Abstract. Understanding the integrity of well-bore systems that are lined with Portland-based cements is critical to the successful storage of sequestered CO 2 in gas and oil reservoirs. As a first step, we investigate reaction rates and mechanistic pathways for cement mineral growth in the absence of CO 2 by coupling water chemistry with XRD and NMR spectroscopic data.

WhatsApp:+8617329420102

Comparison between Geopolymer and Portland cement for Construction and ...

Q = Quartz F =Feldspar G =Gypsum B =Bassanite FI =Fillosilicates XRD diagram • 20 wt.% of aggregate <250 µm • Sulphatespresence F. Volpintesta - GeopolymerCamp - 06 July2022 0 20 40 60 80 100 0 2 4 6 8 passing amount (%) sieve mesh size (mm) UNI EN 196-1 aggregate CDW0-8 Grainsizedistribution

WhatsApp:+8617329420102

Carbonation of Concrete With Construction and Demolition Waste Based ...

The process is affected by a number of factors [12-15], including concrete saturation degree, water/cement ratio, cement content, mineral additions, aggregate type, curing time, porosity, CO 2 concentration, relative humidity and temperature. Interest in the effect of recycled aggregates on CO 2

WhatsApp:+8617329420102

A Talc-Based Cement-Poor Concrete for Sealing Boreholes in Rock

Deep investigation boreholes in crystalline rock for site selection of repositories for high-level radioactive waste are proposed to be sealed by installing a series of dense concrete and clay plugs. These should prevent radionuclides from leaking canisters at depth to migrate to the biosphere through the holes. The concrete seals will be installed where the holes intersect water-bearing ...

WhatsApp:+8617329420102

Synthesis of Alkali Activated Geopolymer Cement from Clay

XRD analysis. The X-ray diffraction pattern of RC, RHA, WC, and RC based geopolymer. The XRD patterns of the sample were plotted between 2θ angles 20 to 80°. The peaks around 2θ=21, 27, 5, 5, 6, 69° represent the presence of quartz (Silica). The entire picks were prominent in case of geopolymer mixture.

WhatsApp:+8617329420102

University of Bath - CORE

Table 1 Mineralogical analysis by X-Ray diffraction. Constituents (wt%) Kaolinite Mica Quartz Feldspar Schorl Mica (M) 8 9 50 22 11 China Clay Sand (CCS) 4 9 58 21 8 Table 2 Aggregate properties. Stent China clay sand 0/4 Mica ... a Portland cement conventional concrete design was used based on the BRE guide for concrete mixes [15]. ...

WhatsApp:+8617329420102

Identification of zeolites in concretes affected by Maiza, P., Marfil ...

The same as in Concrete N 1, aggregate has strained quartz, then it is considered potentially reactive. There also are small amounts of feldspars. Cement portland paste has many fissures. These microcracks can also be seen at the contact zone between grains and cement.

WhatsApp:+8617329420102

Effects of the secondary minerals on the pozzolanic activity of ...

X-ray diffraction (XRD) was carried out to determine the mineralogical composition of the crude and the centrifuged samples. The X- ray diffractometer used in this investigation was a Philips X 'Pert Pro System. The per min from 0 to 60°. In order to identify more precisely the nature of the clay minerals, the clay fraction was

WhatsApp:+8617329420102

Phase Analysis of Portland Cement by Combined Quantitative X-Ray ... - NIST

The first application of X-ray powder diffraction (XRD) to portland cement powder was made by Brownmiller and Bogue in 1930 [1], only 35 years after X-rays were discovered. At the time, portland ... Brownmiller and Bogue compared X-ray diffraction patterns obtained from a commercial portland cement clinker to those obtained from individually ...

WhatsApp:+8617329420102

The role of lithium compounds in mitigating alkali-gravel aggregate ...

2.2. Cement Portland cement CEM I 42,5R containing 0.66% Na 2O e was used. Table 2 shows the chemical composition of the cement. 2.3. Test methods To evaluate the potential reactivity of the gravel aggregate, the accelerated ASTM C1260 method was used together with the long-term ASTM C227 method [18,19].

WhatsApp:+8617329420102

(PDF) Assessment of crystalline phase changes and glass formation by ...

Assessment of crystalline phase changes and glass formation by Rietveld- XRD method on ceramic lightweight aggregates sintered from mineral and polymeric wastes. Jacinto Alonso. Download Download PDF. Full PDF Package Download Full ... Microstructure and mineralogy of lightweight aggregates produced from washing aggregate sludge, fly ash and ...

WhatsApp:+8617329420102

Mat-721: Alkali-silica Reactivity in Southwestern Ontario Aggregates

X-ray diffraction (XRD- Bruker D8 diffractometer) was carried out on all fine aggregate samples. All samples were dried and grounded to pass the 200 μm sieve before testing. Cu-Kα radiation with a wavelength of 1.54 Å was conducted at a voltage of 40 kV. The scanning speed was 2o/min at a current of 35 mA. 3.3 Petrographic Analysis

WhatsApp:+8617329420102

Feasibility Study of Developing Green ECC Using Iron Ore Tailings ...

pared with portland cement). Materials The materials used for making green ECC in this study include IOTs, Type I ordinary portland cement (PC, ASTM C150/C150M 2012a), BFS, silica sand, polyvinyl alcohol (PVA) fiber, water, and a high-range water-reducing admixture (HRWRA). The BFS is ASTM-Grade 120 slag and has a Blaine fineness of 550 m2=kg.

WhatsApp:+8617329420102

Appendix P - Reliability of Spectroscopic Measurements | Evaluating ...

An alternative avenue that could be pursued would be to infer the amount of aggregate used by tracking the contents of its mineral compounds that are not present in portland cement (e.g., quartz). However, the quantitative analyses of the aggregates showed that there were several common miner- als at high quantities [quartz, albite (feldspar ...

WhatsApp:+8617329420102

Using Petrographic Techniques Heather Spring and Thomas Spring

Alkali-silica reactivity (ASR) is widely accepted as a chemical reaction between alkalis in Portland cement and particular forms of reactive silica that occur naturally in aggregates used in concrete production. It results in the formation of an alkali-silica gel which is expansive.

WhatsApp:+8617329420102

Atomic and Nuclear Physics - Nipne

fig. 3 - thin sections of portland cement mortar s3: a) 1- quartz, 2- feldspar, 3-mice, 4-reaction crown around the quartz, 5-opaque minerals in the groundmass, 6- carbonate groundmass, 7- biotite; scale bar 100 µm, n+ b) 1-pore, 2-corosion of quartz, 3-criptocristaline carbonate groundmass, 4- reaction crown around the quartz, 5-fine groundmass .

WhatsApp:+8617329420102

Demolition Waste Potential for Completely Cement-Free Binders

Due to renovation and fighting in the world, a huge accumulation of construction and demolition waste is formed. These materials are effectively used as aggregates, but there is very little information about the use of scrap concrete to create cementless binders. The purpose of the work is to be a comprehensive study of the composition and properties of concrete wastes of various fractions ...

WhatsApp:+8617329420102

Durability improvement of ancient bricks by cementation of porous media

These were produced before the end of the 19th century, when Portland cement first appeared in building constructions.11,12 When lime mortars ... DIP displays quartz, feldspar, illite, calcite, gehlenite and hematite. In the polarizing microscope K- ... the XRD analyses of the oriented aggregates show that phyllosilicates are mainly ...

WhatsApp:+8617329420102

Evaluating the role of feldspar on the resistivity of alkali-activated ...

The XRD patterns were recorded using Philips PW 1050/70 powder diffractometer with Ni-filtered Cu Kα radiation in the 5-70 2° range. The data were identied θ according to the XRD software (pdf-2: database on CD- Release 2005). The powdered samples in a laboratory ball mill with a particle size of 30 μm were used for this analysis.

WhatsApp:+8617329420102

Dealing with Alkali-Aggregate Reaction in Hydraulic Structures

By Chongjiang Du. Alkali-aggregate reaction (AAR) is a chemical reaction between the alkali in Portland cement and reactive minerals in aggregate and additives that takes place when moisture is present. This reaction results in the formation of a hygroscopic gel that absorbs water and expands, causing significant expansion and characteristic ...

WhatsApp:+8617329420102

Production of Greener High-Strength Concrete Using Russian Quartz ...

Quartz sandstone (QS) is a mine waste; therefore, its use in construction allows for both reducing the cost of the concrete and contributing to the utilization of waste. The scientific originality of this study is the identification of models of the effect of QS aggregate on the physicomechanical, durability characteristics, and eco-safety of greener high-strength concrete. The study used an ...

WhatsApp:+8617329420102

XRD patterns of three different limestone samples. C. Calcite; Q. quartz.

Portland cement consists mainly of lime (CaO), silica (SiO2), alumina (Al2O3), and ferric oxide (Fe2O3) compounds. The combined content of these four oxides (major constituents) is approximately...

WhatsApp:+8617329420102

Quantitative study of Portland cement hydration by X-ray diffraction ...

This is a typical standard Portland cement (CEM I in European nomenclature; Type 1 in ASTM nomenclature). The cement paste was mixed by hand for 2 min at a water-to-cement ratio of 0.4. Ten percent corundum (Al 2 O 3), relative to the weight of cement, was blended with the cement powder before mixing to serve as an internal standard. This ...

WhatsApp:+8617329420102

Basalt waste added to Portland cement - Redalyc

Abstract: Portland cement is widely used as a building material and more than 4.3 billion tons were produced in 2014, with increasing environmental impacts by this industry, mainly through CO2 emissions and consumption of non-removable raw materials. Several by-products have been used as raw materials or fuels to reduce environmental impacts.

WhatsApp:+8617329420102

Materials | Free Full-Text | Sustainable Ecocements: Chemical and ...

Nov 3, 2020The present paper studies the possibility of 10% substitution of the waste from a granite sawmill in an ordinary Portland cement to obtain a sustainable, ecological cement that takes advantage of the waste from the granite cutting industry that until now has generated large volumes without a specific use. 2. Materials and Methods 2.1. Materials

WhatsApp:+8617329420102

A study on the effect of fly ash and silica fume substituted cement ...

of raw materials with X-ray diffraction (XRD) were invest-tigated. Moreover, molecular structures of raw materials with Fourier transform infrared spectroscopy (FT-IR) were investigated. MATERIALS AND METHODS Materials o The raw materials used in this study were PC, FA, SF standard aggregate and water. The PC was CEM I 42.5 R in accordance with

WhatsApp:+8617329420102

Study on Microstructure of High Strength (M100) Hybrid Fiber ... - DeepDyve

X-ray diffraction (XRD) analysis is carried out to determine the phase amounts of various compounds in a multiple phase mixture of HSHFSC concrete. ... Aspect Ratio 857:1 and diameter 14μm are used. 1.1 Cement 1.6 Master Glenium ACT 30 Ordinary Portland cement of 53 grade is used in this investigation. The cement used has been tested for ...

WhatsApp:+8617329420102

Alkali silica reaction a multidisciplinary approach - RILEM

Aligned SEM secondary electron images of (a) quartz and K-feldspar areas of P aggregate before dissolution, (b) after 21 days and (c) 60 days of dissolution in 0.4 M KOH solution at 38 °C, and (d) scratch area fraction (%) for quartz, K‐feldspar and muscovite areas of P aggregate

WhatsApp:+8617329420102

Binders alternative to Portland cement and waste management for ...

This topic is extremely complex, especially because of many compatibility issues between existing structures and Portland cement repair mortars. 214 -217,218 In fact, use of Portland cement mixtures on masonry structures can cause damage due to the presence of sodium and potassium ions, which can promote an alkali-aggregate reaction, 219 or ...

WhatsApp:+8617329420102

10.1016/j.cemconres.2013.08.007 | DeepDyve

Deleterious ASR breaks up concrete and was first recognized as a reaction between aggregate and alkalis by Stanton [1] . ... The alkali-silica reaction ASR can be described as a chemical reaction between alkalis Na and/or K supplied by the cement paste, with quartz (SiO 2 ) in susceptible aggregate lithologies [3] producing an amorphous ...

WhatsApp:+8617329420102

Tests Research on Grouting Materials of Waste-Concrete-Powder Cement ...

The WCP was tested by Bruker X-ray diffraction, and the test result is shown in Figure 3. The main mineral composition of WCP is calcite, dolomite, quartz, and sodium feldspar. The main component of calcite is CaCO 3, which may be produced by the carbonization of Ca(OH) 2 in concrete. The main component of quartz is SiO 2.

WhatsApp:+8617329420102

aerated cement mining - tablesandthyme

Types of aerated concrete: Based on the method of pore-formation it is classified into two types as follows: 1.Gas Concrete: Gas concrete is a mixture of water, cement, and very good aggregate with the final addition of a pore-forming chemical that produces air voids within the aqueous mixture at atmospheric pressure. Read More

WhatsApp:+8617329420102

US20170057872A1 - Alkali-Activated Natural Aluminosilicate Materials ...

Disclosed are masonry product feedstock compositions having natural aluminosilicate minerals, e.g., clay minerals and feldspars, to activate a geopolymer reaction. During the formation and curing of a masonry product, an alkali activator creates structural bonds within a mix of aggregates in the feedstock having a low moisture content (e.g., 5-10% by weight).

WhatsApp:+8617329420102

Dedolomitization and alkali-silica reactions in low-expansive ... - UNLP

microscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM) and electron probe microanal- ... of quartz, feldspar, fragments of rhyolitic volcanic rocks, illite, ... aggregates and 0.1% at 28 days to evaluate alkali-carbonate reactive aggregates. A normal portland cement with compressive strength P40 MPa at 28 days, denominated ...

WhatsApp:+8617329420102

Synthesis and Characterization of a Red Clay Based New Composite ...

3. Results and Discussions. 3.1. Characterization of the Raw Materials. Results of chemical FX analyses of the raw materials show that the red clay is relatively rich in silica (59.32%) calcium (2.1%) and iron oxide (4.29%).The presence of potassium oxide (0.18%) and sodium (0.8%) in clay raw material is probably due to the relatively large amount of illite content.

WhatsApp:+8617329420102

Microstructure of selected aggregate quartz by XRD, and a critical ...

This paper investigates the ASR potential of twelve Italian concrete aggregates, by petrography, mortar bar expansion testing, and test the quartz potential reactivity by calculating the QCI and by...

WhatsApp:+8617329420102

SciELO - Brasil - Alkali-silica reaction (ASR) - Investigation of ...

Three mortar bars of dimensions (25 x 25 x 285) mm were prepared and analyzed for each sample, with proportions of cement to aggregate of 1: 2.25 and a water/cement of 0.47 (by mass) by the accelerated method and other standard tests [11 11 American Society for Testing and Materials, Potential Alkali Reactivity of Aggregates (Mortar-Bar Method ...

WhatsApp:+8617329420102

Research Article Nature of C-(A)-S-H Phases Formed in the ... - Hindawi

Concrete is made of cement, aggregates (inert granular materials such as sand, gravel, or crushed stone), and water. Additionally, supplementary cementing materials (e.g., y ash, silica fume) and chemical admixtures can be incorpo-rated. For laboratory experiments, usually cement mortar is used instead of concrete. e cement/bentonite interactions,

WhatsApp:+8617329420102

Characterization of Kaolin Deposits in Okpella and Environs, Southern ...

The XRD results revealed that the Ajego 1 area consists mainly of kaolinite, with a mixed layer of illite/kaolinite and quartz (Microcline) as framework constituents ( Figure 5 ). Samples from the Ajego 2 area consists more of plagioclase and alkali feldspar, with albite and quartz composition ( Figure 6 ).

WhatsApp:+8617329420102

Aggregates for Concrete - University of Memphis

contains quartz, feldspar, mica, and a few other minerals; most limestones consist of calcite, dolomite, and minor amounts of quartz, feldspar, and clay. Weathering and erosion of rocks produce particles of stone, gravel, sand, silt, and clay. Recycled concrete, or crushed waste concrete, is a feasible source of aggregates and an economic reality,

WhatsApp:+8617329420102

Related Posts

Solve the problem?
Get the latest quotation? Hit The Button.

Online Service