scholarly journals Mechanical Properties and Durability Performance of Concrete Containing Calcium Carbide Residue and Nano Silica

Materials ◽  
2021 ◽  
Vol 14 (22) ◽  
pp. 6960
Author(s):  
Musa Adamu ◽  
Yasser E. Ibrahim ◽  
Mohamed E. Al-Atroush ◽  
Hani Alanazi
Keyword(s):  
Mechanical Properties ◽  
Water Absorption ◽  
Environmental Sustainability ◽  
Ph Value ◽  
Calcium Carbide ◽  
Cementitious Materials ◽  
Cement Matrix ◽  
Nano Silica ◽  
High Calcium ◽  
Calcium Carbide Residue

Calcium carbide residue (CCR) is the end-product of production of acetylene gas for the applications such as welding, lighting, ripening of fruits, and cutting of metals. Due to its high pH value, disposing of CCR as a landfill increases the alkalinity of the environment. Therefore, due to its high calcium content, CCR is mostly blended with other pozzolanic materials, together with activators as binders in the cement matrix. In this study, cement was partially substituted using CCR at 0%, 7.5%, 15%, 22.5% and 30% by weight replacement, and nano silica (NS) was utilized as an additive by weight of binder materials at 0%, 1%, 2%, 3% and 4%. The properties considered were the slump, the compressive strength, the flexural strength, the splitting tensile strength, the modulus of elasticity, and the water absorption capacity. The microstructural properties of the concrete were also examined through FESEM and XRD analysis. The results showed that both CCR and NS increase the concrete’s water demand, hence reducing its workability. Mixes containing up to 15% CCR only showed improved mechanical properties. The combination of CCR and NS significantly improved the mechanical properties and decreased the concrete’s water absorption through improved pozzolanic reactivity as verified by the FESEM and XRD results. Furthermore, the microstructure of the concrete was explored, and the pores were refined by the pozzolanic reaction products. The optimum mix combination was obtained by replacing 15% cement using CCR and the addition of 2% NS by weight of cementitious materials. Therefore, using a hybrid of CCR and NS in concrete will result in reduction of cement utilization in concrete, leading to improved environmental sustainability and economy.

Silica Modified PP Fiber for Improving Crack-Resistance of Cementitious Composites

2011 ◽  
Vol 332-334 ◽  
pp. 2058-2064 ◽  
Author(s):  
Zhi Qian Yang ◽  
Jian Zhong Liu ◽  
Jia Ping Liu ◽  
Chang Feng Li ◽  
Hua Xin Zhou
Keyword(s):  
Crack Resistance ◽  
Sol Gel ◽  
Polypropylene Fiber ◽  
Chemical Deposition ◽  
Cementitious Materials ◽  
Nano Particles ◽  
Cement Matrix ◽  
Interfacial Property ◽  
Nano Silica ◽  
Fiber Matrix

To improve the interfacial bonding properties of polypropylene fiber-cement matrix, a new type of nano-silica modified polypropylene fibers was prepared by direct blend-spinning. As a comparison, Another polypropylene fiber was modified by surface chemical deposition of the silica particles by sol-gel method. The distribution of nano-particles on the fiber surface was observed with scanning electron microscope (SEM). This paper focuses on the effects on crack-resistance properties of fiber reinforced mortar(FRM) and present the mechanism of improving fiber-matrix interfacial properties, especially. The results demonstrate that the modified fiber with well-distributed of nano-silica has excellent mechanical properties, and crack resistance. The interfacial property of fiber-matrix is improved because of silica’s hydration activity. As the use of two kinds of modified fiber, the cementitious materials crack area is significantly decreased. In conclusion, the modified fiber by chemical deposition method which has slightly better overall performance.

Utilization of Nano Silica as Cement Paste in Mortar and Porous Concrete Pavement

2015 ◽  
Vol 1113 ◽  
pp. 135-139 ◽  
Author(s):  
Mohd Yusak Mohd Ibrahim ◽  
Putra Jaya Ramadhansyah ◽  
Hainin Mohd Rosli ◽  
Mohd Haziman Wan Ibrahim ◽  
M.N. Fadzli
Keyword(s):  
Mechanical Properties ◽  
Cement Paste ◽  
Cementitious Materials ◽  
Concrete Pavement ◽  
Strengthening Effect ◽  
Nano Silica ◽  
Porous Concrete ◽  
The Right

The high percentage of porosity in porous concrete pavement tends to decrease its strength. In concrete industry, nano silica is one of the most popular materials that will improve the properties of cementitious materials. This paper, prepared to review the effect of nano silica in cement paste and mortar related to porous concrete pavement. It was found that, by incorporating nano silica with the right composition in cement paste and mortar, it will improve their mechanical properties. By incorporating nano silica in the mixture, it can be predicted that the strengthening effect of nano silica would be further enhanced in porous concrete because the nano silica improve not only the cement paste, but also the interface between paste and aggregate.

scholarly journals Effect of nano-silica as cementitious materials-reducing admixtures on the workability, mechanical properties and durability of concrete

2021 ◽  
Vol 10 (1) ◽  
pp. 1395-1409
Author(s):  
Changjiang Liu ◽  
Xin Su ◽  
Yuyou Wu ◽  
Zhoulian Zheng ◽  
Bo Yang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Building Materials ◽  
Setting Time ◽  
Microscopic Analysis ◽  
Chloride Ion ◽  
Cementitious Materials ◽  
Hydration Reaction ◽  
Ion Permeability ◽  
Nano Silica ◽  
Durability Of Concrete

Abstract Nano-silica (NS) is one of the most important nanomaterials in recent years. It is used as a new cement-based composite reinforcement in building materials because of its high volcanic ash activity. In order to achieve the goal of carbon peaking and carbon neutralization, combined with the research idea of cementitious materials-reducing admixture for concrete, under the condition of reducing the amount of cement in concrete by 20%, the influence of different dosages of NS on the setting time and mechanical properties of concrete was analyzed. In addition, the shrinkage performance, impermeability, and resistance to chloride-ion permeability of concrete were also studied. The results show that under the same curing conditions and ages, when the NS dosage is 2.5%, the compressive strength and splitting tensile strength of the specimen after 28 days of curing are the highest, reaching 40.87 and 3.8 MPa, which show an increase by 6.6 and 15.15%. The shrinkage performance of concrete increases with the increase in NS dosage. In addition, when the NS dosage is 2.0%, the durability of concrete has also been greatly improved. The impermeability of concrete increased by 18.7% and the resistance to chloride-ion permeability increased by 14.7%. Through microscopic analysis it was found that NS can promote the hydration reaction, generate more hydration products such as calcium silicate hydrate (C–S–H), enhance the interfacial adhesion between the matrix and the aggregate, and form a closer interfacial transition zone. Moreover, the addition of NS also reduces the cumulative pore volume in concrete, refines the pore size, and makes the internal structure of concrete denser.

Properties of Pervious Geopolymer Concrete Made from High-calcium Fly Ash Containing Calcium Carbide Residue

2020 ◽  
Vol 30 (2) ◽  
Author(s):  
Khattiya Chompoovong ◽  
Tanakorn Phoo-ngernkham ◽  
Satakhun Detphan ◽  
Chudapak Detphan ◽  
Sakonwan Hanjitsuwan ◽  
...  
Keyword(s):  
Fly Ash ◽  
Calcium Carbide ◽  
Geopolymer Concrete ◽  
High Calcium ◽  
High Calcium Fly Ash ◽  
Calcium Carbide Residue

scholarly journals Low cost and sustainable repair material made from alkali-activated high-calcium fly ash with calcium carbide residue

2020 ◽  
Vol 247 ◽  
pp. 118543 ◽  
Author(s):  
Tanakorn Phoo-ngernkham ◽  
Chattarika Phiangphimai ◽  
Darrakorn Intarabut ◽  
Sakonwan Hanjitsuwan ◽  
Nattapong Damrongwiriyanupap ◽  
...  
Keyword(s):  
Fly Ash ◽  
Low Cost ◽  
Calcium Carbide ◽  
Repair Material ◽  
High Calcium ◽  
High Calcium Fly Ash ◽  
Calcium Carbide Residue ◽  
Alkali Activated

scholarly journals Multi-Objective Optimization of Nano-Silica Modified Cement-Based Materials Mixed With Supplementary Cementitious Materials Based on Response Surface Method

2021 ◽  
Vol 8 ◽  
Author(s):  
Xiuzhi Zhang ◽  
Liming Lin ◽  
Mengdi Bi ◽  
Hailong Sun ◽  
Heng Chen ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Response Surface ◽  
Cementitious Materials ◽  
Plastic Viscosity ◽  
Supplementary Cementitious Materials ◽  
Quadratic Term ◽  
Multi Objective Optimization ◽  
Nano Silica ◽  
Surface Method ◽  
Cement Based Materials

This paper investigates the effect of supplementary cementitious materials (SCMs) on the fresh and mechanical properties of nano-silica modified cement-based materials (NSMCBM) based on the response surface method (RSM). Fly ash (FA), ground granulated blast-furnace slag (GGBFS), and silica fume (SF) were selected and the Box-Behnken design (BBD) method was used to design mix proportion. Besides, the quadratic term model was used to describe the relationship between independent variables and responses including fluidity, yield stress, plastic viscosity, thixotropy, and 3, 7, 28, and 56 d compressive strength. Based on the quadratic term model, the response surface of each response was drawn to understand the influence of SCMs. Results showed that FA had significant effect on fluidity and thixotropy while three kinds of SCMs had extremely significant effect on plastic viscosity. Response surface plot showed that NS could increase the plastic viscosity of NSMCBM to 1.445 Pa•s (M16). However, the addition of FA and GGBFS decreased the plastic viscosity to 0.9 Pa•s, which was comparable with the reference sample (M17). Such value was 37.7% lower than that of M16. Meanwhile, NS complemented the reduction of compressive strength caused by SCMs. Thus, the synergy effect of SCMs and NS could improve both fresh and mechanical properties. At last, multi-objective optimization was utilized to optimize the proportion of SCMs considering the interaction between SCMs to achieve desirable parameters.

scholarly journals Durability of the earth mortar: Physico-chemical and mineralogical characterization for the reduction of the capillary rise

2018 ◽  
Vol 149 ◽  
pp. 01024
Author(s):  
A. Ammari ◽  
K. Bouassria ◽  
N. Zakham ◽  
M. Cherraj ◽  
H. Bouabid ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Water Absorption ◽  
Chemical Elements ◽  
Capillary Rise ◽  
Cement Matrix ◽  
Mineralogical Characterization ◽  
Water Absorption Coefficient ◽  
The Earth ◽  
Bad Weather ◽  
Strength And Durability

The stabilization of the earth material in the fields related to the earthen construction, in compliance with the standards in force, allows strong results of strength and durability. The chemical and mineralogical elements play an important role, in the presence of an 'optimum' cement dosage, to strengthen the ties between the clays and the grains of the earth.. This approach targets the search for better performances in the use of natural materials resource in an eco-responsible habitat. This study presents the experimental results of the four techniques of mineralogical and chemical analysis on mortar specimens obtained from earth of the city of Fez. The results of the uni-axial compressive tests of the cylindrical specimens for this earth, associated by various percentages 0%, 4%, 7% and 10% by weight of cement, make it possible to analyze the effect of the mineralogical and chemical elements on the mechanical properties, namely Young's modulus, compressive strength and limiting deformation. However, we determine the water absorption coefficient of the mortar for different cement dosages in order to optimize the durability of the mortar against bad weather, rain and / or very wet climates. In the earth mortar of Fez, the strong presence of calcite (CaCO3), quartz SiO2 and dolomite CaMg (CO3)2 amplifies the improvement of the behavior of the material by the addition of cement. In fact, this strong presence of calcite stabilized the clay by cementing quartz and the cement matrix to strengthen the ties between the grains of the earth. In addition, with respect to the capillary rise, the water absorption decreases with the addition of cement. We also note that the evolution of the mechanical properties is of no importance except in the interval [4 to 7%] which represents the zone of effect for cement stabilization and which houses the optimum technicoeconomic cement dosing.

scholarly journals Design and predicting performance of carbon nanotube reinforced cementitious materials : mechanical properties and dipersion characteristics.

2020 ◽  
Author(s):  
Mahyar Ramezani
Keyword(s):  
Mechanical Properties ◽  
Elastic Modulus ◽  
Aspect Ratio ◽  
Flexural Strength ◽  
Experimental Test ◽  
Cementitious Materials ◽  
Matrix Composition ◽  
Cement Matrix ◽  
Test Results ◽  
Cement Ratio

Recently, Carbon Nanotubes (CNTs) are drawing considerable attention of researchers for reinforcing cementitious materials due to their excellent mechanical properties and high aspect ratio (length-to-diameter ratio). However, CNTs might not disperse well within the cement matrix, resulting in little improvement or even degradation of concrete properties. The uncertainty in producing the consistent results in different studies might be attributed to multiple interactions between the experimental variables affecting the nanotube dispersion and the final properties of CNT-cement nanocomposites. Therefore, this research mainly focused on proposing equations that can reliably capture these interactions in order to correlate CNT dispersion with the mechanical properties. The main experimental variables studied included CNT concentration, aspect ratio, ultrasonication energy, ultrasonication amplitude, surfactant-to-CNTs ratio, water-to-cement ratio, sand-to-cement ratio, and hydration age of specimen. The study reported in this research was conducted in two parts: experimental program and modeling. In the experimental part of this research, a total of 63 different mix proportions were used to evaluate the flowability, mechanical properties, and durability characteristics of cement pastes and mortars containing CNTs. Using experimental test results reported in this study and the literature, three critical relations were proposed to consider the CNT dispersion, cement matrix composition, and hydration age of cement. The proposed critical relations were then added to available theoretical models in the literature. The flexural strength and elastic modulus of CNT-cement nanocomposites were predicted through a state-of-the-art probabilistic model using a Bayesian methodology. Finally, the developed probabilistic models were used to identify the optimum ranges of the experimental variables to maximize the mechanical properties. This was done through computing the conditional probability of not meeting the specified design requirement. The experimental results indicated that addition of CNTs could significantly improve different properties of cementitious materials, if the optimum range of each variable was used. Also, to achieve the desired mechanical properties, various combinations of the experimental variables might be used. The proposed prediction models were shown to capture the interactions between the experimental variables for predicting the mechanical properties within ±15% and ±18% of the experimental test results for flexural strength and elastic modulus, respectively. Based on the findings of this research, contour plots were developed to provide practical guidelines for future engineers to design CNT-cement nanocomposites.

scholarly journals Mechanical and Rheological Properties of 3D Printable Cement Composites

2020 ◽  
Vol 2 (4) ◽  
Author(s):  
Maathar Al Qasimi ◽  
Dhafer Mana Al Zulayq ◽  
Mostafa Seifan ◽  
Keyword(s):  
Mechanical Properties ◽  
Complex Geometry ◽  
Failure Surface ◽  
Total Solid ◽  
Cementitious Materials ◽  
Cement Composites ◽  
Nano Silica ◽  
Solid Matter ◽  
Hardened Properties ◽  
Micro Silica

Additive manufacturing is a recent revolution in the construction field since cementitious materials became printable. This extrusion technique has enabled the construction of very complex geometry with a reduction in costs, time and labour interventions. This study aims to evaluate the possibility of reinforcing 3D printable cementitious composites with the use of nano and micro materials, particularly nano silica, micro silica and microfibrillated cellulose (MFC) which are known for their ability to enhance the fresh and hardened properties of cement-based composites. Rheology property test, flowability and mechanical properties are the types of tests performed to evaluate the fresh and hardened properties of mortar modified with the rested additives. The results show the addition of MFC of 0.4% (of total solid matter) can significantly enhance the mechanical property. In addition, the presence of MFC (at 0.4% of total solid matter) can reduce the pressure required to extrude the mortar, enabling a steady state extrusion. It was also found that 1% nano silica addition significantly improves the mechanical properties and minimizes segregation in the failure surface.

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