Methyl orange assisted dispersion of graphene oxide in the alkaline environment for improving mechanical properties and fluidity of ordinary portland cement composites

ABSTRACTThe effects of waste polyethylene aggregate as admixture agent in Portland cement at different addition polyethylene/cement ratios from 0.0156 to 0.3903 were investigated. The reinforced samples were prepared according the ASTM C 150 Standard (samples of 5 × 5 × 5 cm). The reinforcing fibers were milling at a size of 1/25 in diameter, form waste and used them to evaluate the effects in mechanical properties in cement-based composites. The evaluation of polyethylene as additive was based on results of density and compression tests. The 28-day compressive strength of cement reforced with plastic waste at a replacement polyethylene/cement ratio of 0.0468 was 23.5 MPa compared to the control concrete (7.5 MPa). The density of cement replaced with polyethylene varies from 2.114 (0% polyethylene) to 1.83 g/cm3 by the influence of polyethylene.

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Fabrication and properties of 3-3 type PZT-ordinary Portland cement composites

Construction and Building Materials ◽

10.1016/j.conbuildmat.2021.124815 ◽

2021 ◽

Vol 305 ◽

pp. 124815

Author(s):

Wei Liu ◽

Lehui Zhang ◽

Yu Cao ◽

Jianhong Wang ◽

Peikang Bai ◽

...

Keyword(s):

Portland Cement ◽

Ordinary Portland Cement ◽

Cement Composites

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Preparation and Mechanical Properties of Graphene Oxide: Cement Nanocomposites

The Scientific World JOURNAL ◽

10.1155/2014/276323 ◽

2014 ◽

Vol 2014 ◽

pp. 1-10 ◽

Cited By ~ 83

Author(s):

Fakhim Babak ◽

Hassani Abolfazl ◽

Rashidi Alimorad ◽

Ghodousi Parviz

Keyword(s):

Mechanical Properties ◽

Tensile Strength ◽

Graphene Oxide ◽

Cement Mortar ◽

Cement Matrix ◽

Cement Composites ◽

Xrd Diffraction ◽

Calcium Silicate Hydrates ◽

The Matrix ◽

Scanning Electron

We investigate the performance of graphene oxide (GO) in improving mechanical properties of cement composites. A polycarboxylate superplasticizer was used to improve the dispersion of GO flakes in the cement. The mechanical strength of graphene-cement nanocomposites containing 0.1–2 wt% GO and 0.5 wt% superplasticizer was measured and compared with that of cement prepared without GO. We found that the tensile strength of the cement mortar increased with GO content, reaching 1.5%, a 48% increase in tensile strength. Ultra high-resolution field emission scanning electron microscopy (FE-SEM) used to observe the fracture surface of samples containing 1.5 wt% GO indicated that the nano-GO flakes were well dispersed in the matrix, and no aggregates were observed. FE-SEM observation also revealed good bonding between the GO surfaces and the surrounding cement matrix. In addition, XRD diffraction data showed growth of the calcium silicate hydrates (C-S-H) gels in GO cement mortar compared with the normal cement mortar.

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Physical Properties of Concrete Containing Graphene Oxide Nanosheets

Materials ◽

10.3390/ma12101707 ◽

2019 ◽

Vol 12 (10) ◽

pp. 1707 ◽

Cited By ~ 4

Author(s):

Yu-You Wu ◽

Longxin Que ◽

Zhaoyang Cui ◽

Paul Lambert

Keyword(s):

Tensile Strength ◽

Compressive Strength ◽

Graphene Oxide ◽

Flexural Strength ◽

Portland Cement ◽

Physical Properties ◽

Ordinary Portland Cement ◽

Construction Materials ◽

Split Tensile Strength ◽

Cement Pastes

Concrete made from ordinary Portland cement is one of the most widely used construction materials due to its excellent compressive strength. However, concrete lacks ductility resulting in low tensile strength and flexural strength, and poor resistance to crack formation. Studies have demonstrated that the addition of graphene oxide (GO) nanosheet can effectively enhance the compressive and flexural properties of ordinary Portland cement paste, confirming GO nanosheet as an excellent candidate for using as nano-reinforcement in cement-based composites. To date, the majority of studies have focused on cement pastes and mortars. Only limited investigations into concretes incorporating GO nanosheets have been reported. This paper presents an experimental investigation on the slump and physical properties of concrete reinforced with GO nanosheets at additions from 0.00% to 0.08% by weight of cement and a water–cement ratio of 0.5. The study demonstrates that the addition of GO nanosheets improves the compressive strength, flexural strength, and split tensile strength of concrete, whereas the slump of concrete decreases with increasing GO nanosheet content. The results also demonstrate that 0.03% by weight of cement is the optimum value of GO nanosheet dosage for improving the split tensile strength of concrete.

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Experimental Study on Compatibility between Alkali-Free Liquid Concrete Accelerators and Cement

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.438-439.102 ◽

2013 ◽

Vol 438-439 ◽

pp. 102-107 ◽

Cited By ~ 2

Author(s):

Wen Kang Guo ◽

Li Wang ◽

Shu Yin Wang ◽

Dao Yin Lan ◽

Sheng Ping Li

Keyword(s):

Mechanical Properties ◽

Experimental Study ◽

Compressive Strength ◽

Portland Cement ◽

Ordinary Portland Cement ◽

Strength Ratio ◽

Setting Times ◽

Gypsum Content ◽

Durability Of Concrete

This paper selected two kinds of alkali-free liquid concrete accelerators and tested their compatibility with ordinary Portland cement, Portland cement and moderate heat Portland cement by measuring the setting times, compressive strength and compressive strength ratio of samples. The results showed that the compatibility is good between alkali-free accelerators and two types of cement: ordinary Portland cement and moderate heat Portland cement. However, the compatibility of two accelerators and Portland cement are quite different, the compatibility of AFA-2 accelerator is excellent, but AFA-1 accelerator is very poor. The setting times of alkali-free accelerators is mainly influenced by the mixing materials content, gypsum content, C3A and C3S content. In order to ensure the mechanical properties and durability of concrete, the setting times of new concrete accelerator is not the shorter the better, the appropriate initial and final setting times are 1min30s~5min and 4min~ 12min respectively.

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Effect of Graphene Oxide on Mechanical Properties of Cement Mortar and its Strengthening Mechanism

Materials ◽

10.3390/ma12223753 ◽

2019 ◽

Vol 12 (22) ◽

pp. 3753 ◽

Cited By ~ 7

Author(s):

Yahui Wang ◽

Jiawen Yang ◽

Dong Ouyang

Keyword(s):

Mechanical Properties ◽

Graphene Oxide ◽

Cement Hydration ◽

Strengthening Mechanism ◽

Cement Composites ◽

Working Mechanism ◽

Cement Pastes ◽

Cement Mortars ◽

Binder Ratio ◽

Growth Space

The effects of the water–binder ratio and different graphene oxide (GO) sizes on the mechanical properties of GO-cement composites were systematically studied by preparing GO-cement mortars. The scanning electron microscopy observation (SEM) of the surface and fracture surface of cement pastes was carried out to study the morphology of cement hydration crystals in GO-cement systems under different space conditions. It was found that GO nanosheets significantly improved the compressive, flexural, and tensile strengths of cement mortars. When the dosage of GO nanosheets was 0.03% by weight of cement, the compressive, flexural, and tensile strengths at 28 days increased by 21.37%, 39.62%, and 53.77%, respectively, but GO was not found to be able to regulate the formation of flower-like cement hydration crystals. It was only shown that the growth space had an important influence on the morphology of hydrates. A possible working mechanism was proposed by which GO nanosheets prevented the expansion of microcracks in the cement pastes via a shield effect, thus enhancing the strength and toughness of the cement composites.

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Toughening of MDF - OPC Composites

MRS Proceedings ◽

10.1557/proc-211-239 ◽

1990 ◽

Vol 211 ◽

Author(s):

C. K. Park ◽

M. R. Silsbee ◽

D. M. Roy

Keyword(s):

Mechanical Properties ◽

Flexural Strength ◽

Portland Cement ◽

Polymer Composites ◽

Ordinary Portland Cement ◽

Fine Particles ◽

Fiber Type ◽

High Toughness ◽

Strength And Toughness

AbstractMacro-Defect-Free (MDF) materials are cement-polymer composites exhibiting high flexural strengths and high toughness (for cement based systems). The incorporation of fibers into MDF composites has been found to offer the possibility of increasing both the ultimate flexural strength and toughness of MDF materials prepared using an ordinary portland cement-polyacrylamide matrix.This paper examined the effect of fiber type and fine particles as a packing filler on the resulting mechanical properties. The incorporation of non-traditional materials (for MDF) into the MDF matrix is also discussed.

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Structure and Mechanical Properties of Portland Cement-Polyacrylnitril Fiber Composites

MRS Proceedings ◽

10.1557/proc-114-153 ◽

1987 ◽

Vol 114 ◽

Author(s):

I. Odler

Keyword(s):

Mechanical Properties ◽

Composite Materials ◽

Portland Cement ◽

Fracture Mechanism ◽

Cement Composite ◽

Fiber Composites ◽

Cement Composites ◽

Cement Ratio ◽

Variable Water ◽

Pan Fibers

ABSTRACTA series of fiber-cement composite materials was prepared by dispersing different amounts of polyacrylnitril (PAN) fibers in portland cement suspensions of variable water/solid ratios. The samples were used to study the effect of the volume of fibers and the water-cement ratio on the physico-mechanical properties of the material. The distribution of the fibers within the cementitious matrix and the fracture mechanism were studied by SEM and compared with those existing in glass fiber-cement composites.

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Mechanical Properties of Class C High Volume Fly Ash Concrete with Lime Water as Mixing Water

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.660.312 ◽

2014 ◽

Vol 660 ◽

pp. 312-316

Author(s):

Mochamad Solikin ◽

Budi Setiawan

Keyword(s):

Mechanical Properties ◽

Fly Ash ◽

Flexural Strength ◽

Portland Cement ◽

Ordinary Portland Cement ◽

High Volume ◽

Fly Ash Concrete ◽

Lime Water ◽

High Volume Fly Ash ◽

Mixing Water

This paper reports an investigation on mechanical properties of high volume fly ash (HVFA) concrete produced using different types of mixing water i.e. tap water and saturated lime water. The mechanical properties of ordinary Portland cement concrete are also investigated as control tests. The concrete were tested for their compressive strength, flexural strength and splitting tensile strength at the curing ages of 56 days. The results showed that strength development of high volume fly ash concrete up to 56 days is lower than ordinary portal cement. In addition, the flexural strength and splitting strength of concrete are lower than ordinary Portland cement. Moreover, the use of saturated lime water as mixing water reduces the mechanical properties of class C high volume fly ash concrete.

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