scholarly journals Increasing the Durability and Freeze-Thaw Strength of Concrete Paving Stones Produced from Ahlat Stone Powder and Marble Powder by Special Curing Method

2019 ◽  
Vol 2019 ◽  
pp. 1-14 ◽  
Author(s):  
Abdulrezzak Bakis
Keyword(s):  
Tensile Strength ◽  
Splitting Tensile Strength ◽  
Waste Materials ◽  
Freeze Thaw ◽  
Strength Surface ◽  
Different Types ◽  
Marble Powder ◽  
Water Curing ◽  
Curing Method ◽  
Curing Regimes

This study highlights an investigation of using construction waste materials, i.e., Ahlat stone powder and marble powder, in fabricating interlocked paving stones. In this study, the durability and freeze-thaw strength of concrete paving stones produced from Ahlat stone powder and marble powder were increased by the special curing method. Six different types of paving stones were fabricated for study and were subjected to two different curing regimes. Tests of water absorption, splitting tensile strength, surface abrasion, and freeze-thaw were carried out for the specimens. In 3 days and at 20 ± 5°C of water curing, the splitting tensile strength was 3.7 MPa, the surface abrasion value was 9.8 cm3/50 cm2, and the freeze-thaw value was 0.39 kg/m2 for those interlocked paving stones produced from Ahlat stone powder. After special combined curing, these improved to 3.9 MPa, 17.2 cm3/50 cm2, and 0.63 kg/m2, respectively. Accordingly, for interlocked paving stones produced from marble powder, in 3 days and at 20 ± 5°C water curing, the splitting tensile strength, surface abrasion, and freeze-thaw were 3.9 MPa, 7.9 cm3/50 cm2, and 0.34 kg/m2, respectively. After special combined curing, these values improved to 4.1 MPa, 14.8 cm3/50 cm2, and 0.57 kg/m2, respectively. The findings of this study validate increase in durability and freeze-thaw strength of concrete paving stones with special curing.

scholarly journals Effect of Curing Method on Properties of Lightweight Foamed Concrete

2018 ◽  
Vol 7 (2.29) ◽  
pp. 927 ◽  
Author(s):  
Bishir Kado ◽  
Shahrin Mohammad ◽  
Yeong Huei Lee ◽  
Poi Ngian Shek ◽  
Mariyana Aida Ab Kadir
Keyword(s):  
Tensile Strength ◽  
Compressive Strength ◽  
Water Absorption ◽  
Precast Concrete ◽  
Construction Materials ◽  
Splitting Tensile Strength ◽  
Structural Members ◽  
Lightweight Construction ◽  
Foamed Concrete ◽  
Curing Method

Lightweight construction is aimed to achieve a sustainable feature by reducing transportation frequency and construction materials usage during construction phase. Lightweight precast concrete may serve an alternative for the lightweight construction. There are rarely application can be found for structural members as lightweight panels always to be used for secondary or non-load bearing members. This paper presents an experimental study on properties (compressive strength, splitting tensile strength, water absorption) of lightweight foamed concrete (LFC) at two different curing methods. LFC with densities of 1500, 1700, and 1800 kg/m3, cement-sand ratio of 2:1 and water-cement ratio of 0.5 were investigated. The results showed LFC can be produced with the properties ofdensity range of 1500 to 1800 kg/m3 and corresponding compressive strength of 10 to 39 MPa. The higher the density of LFC, the less the water absorption for all the curing method considered, the highest and the lowest water absorption was 11.3% and 2.0% for 1500 kg/m3 cured in water and 1800 kg/m3 cured in air respectively. Compressive strength of LFC increases with age and density while water cured LFC has high compressive strength. Splitting tensile strength increases with density of LFC, but air cured LFC has more splitting tensile strength than water cured of the same density. The highest splitting tensile strength recorded was 3.92 MPa for 1800 kg/m3 cured in air, which was about 16% of its compressive strength at 28 days of curing age. These properties are important and can be applied to LFC precast structural members with air or water curing method which have less references for LFC in structural usage.  

EVALUATION OF SPLITTING TENSILE STRENGTH IN PLAIN AND FIBRE-REINFORCED FOAMED MORTAR

2016 ◽  
Vol 78 (5) ◽  
Author(s):  
M. A. Othuman Mydin
Keyword(s):  
Tensile Strength ◽  
Tensile Force ◽  
Splitting Tensile Strength ◽  
Palm Oil Fuel Ash ◽  
Fuel Ash ◽  
Different Types ◽  
Pulverized Fuel ◽  
Pulverized Fuel Ash ◽  
Coconut Fibre ◽  
Oil Fuel

Splitting tensile strength of concrete is normally low compared to compressive and flexural strength. Tensile force was used in the design of structural foamed mortar and to evaluate the shear resistance provided by concrete. This research focuses on the splitting tensile strength of foamed mortar incorporated with 7 different types of fibres used such as wood ash, pulverized fuel ash, silica fume, palm oil fuel ash, polypropylene fibre, coconut fibre and steel fibre. The findings show that the amount of fibres influences the enhancement level of the tensile strength. A high percentage of fibre can create a strong bonding between the particles of the foamed mortar, thus it is able to absorb energy to resist crack formation.

scholarly journals Study on water stability of asphalt binder with medium weathered igneous rock

2021 ◽  
Vol 293 ◽  
pp. 02055
Author(s):  
Changgui Li ◽  
Yuanhong Tao ◽  
Jingliang Xia
Keyword(s):  
Tensile Strength ◽  
Igneous Rock ◽  
Asphalt Binder ◽  
Hydrated Lime ◽  
Splitting Tensile Strength ◽  
Water Stability ◽  
Freeze Thaw ◽  
Residual Stability ◽  
Technical Measures ◽  
Poor Adhesion

Aiming at the problems of weak acidity of medium weathered igneous rock around Nairobi, Kenya, poor adhesion with asphalt and poor water stability of asphalt binder, the article studied the use of anti-stripping agent, cement, hydrated Lime and other technical measures to improve the water stability of asphalt binder with medium weathered igneous rock. The results showed that the 48h Marshall residual stability of the benchmark asphalt binder without any measures was 78.5%, which did not meet the standard requirements. The Marshall residual stability of medium weathered igneous rock can be significantly improved by adding anti stripping agent, cement and hydrated Lime. After freeze-thaw cycles, the splitting tensile strength of the asphalt binder with medium weathered igneous rock decreased obviously, and the TSR values of the asphalt binder with anti-spalling measures from small to large were K-4, K-3, K-2, K-6 and K-5. The water stability of the medium weathered igneous rock asphalt binder mixed with anti-stripping agent alone had relatively poor durability, and the medium weathered igneous rock asphalt binder mixed with cement and anti-stripping agent had the strongest ability to resist deformation when immersed in water.

scholarly journals The Synergy between Bio-Aggregates and Industrial Waste in a Sustainable Cement Based Composite

Materials ◽  
2021 ◽  
Vol 14 (20) ◽  
pp. 6158
Author(s):  
Cătălina Mihaela Grădinaru ◽  
Adrian Alexandru Șerbănoiu ◽  
Radu Muntean ◽  
Bogdan Vasile Șerbănoiu
Keyword(s):  
Tensile Strength ◽  
Compressive Strength ◽  
Fly Ash ◽  
Splitting Tensile Strength ◽  
Partial Replacement ◽  
Cement Matrix ◽  
Freeze Thaw ◽  
Corn Cobs ◽  
Study Results ◽  
Sunflower Stalks

The effects of the fly ash and of the sunflower stalks and corn cobs within a cement-matrix composite were studied under the aspects of density, compressive strength, splitting tensile strength, elasticity modulus, and resistance to repeated freeze-thaw cycles. In the research were developed 20 recipes of cement-based composite, including the reference composite. Fly ash was used as partial cement replacement (10, 20 and 30% by volume), and the vegetal aggregates made by corn cobs and sunflower stalks as partial replacement of the mineral aggregates (25 and 50% by volume). The study results revealed that a lightweight composite can be obtained with 50% of vegetal aggregates, and the fly ash, no matter its percentage, enhanced the compressive strength and splitting tensile strength of the compositions with 50% of sunflower aggregates and the freeze-thaw resistance of all compositions with sunflower stalks.

scholarly journals Further Investigation on Damage Model of Eco-Friendly Basalt Fiber Modified Asphalt Mixture under Freeze-Thaw Cycles

2018 ◽  
Vol 9 (1) ◽  
pp. 60 ◽  
Author(s):  
Wensheng Wang ◽  
Yongchun Cheng ◽  
Guirong Ma ◽  
Guojin Tan ◽  
Xun Sun ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Asphalt Mixture ◽  
Basalt Fiber ◽  
Asphalt Mixtures ◽  
Splitting Tensile Strength ◽  
Stiffness Modulus ◽  
Freeze Thaw ◽  
Damage Characteristics ◽  
Indirect Tensile

The main distresses of asphalt pavements in seasonally frozen regions are due to the effects of water action, freeze-thaw cycles, and so on. Basalt fiber, as an eco-friendly mineral fiber with high mechanical performance, has been adopted to reinforce asphalt mixture in order to improve its mechanical properties. This study investigated the freeze-thaw damage characteristics of asphalt mixtures reinforced with eco-friendly basalt fiber by volume and mechanical properties—air voids, splitting tensile strength, and indirect tensile stiffness modulus tests. Test results indicated that asphalt mixtures reinforced with eco-friendly basalt fiber had better mechanical properties (i.e., splitting tensile strength and indirect tensile stiffness modulus) before and after freeze-thaw cycles. Furthermore, this study developed logistic damage models of asphalt mixtures in terms of the damage characteristics, and found that adding basalt fiber could significantly reduce the damage degree by about 25%, and slow down the damage grow rate by about 45% compared with control group without basalt fiber. Moreover, multi-variable grey models (GM) (1,N) were established for modelling the damage characteristics of asphalt mixtures under the effect of freeze-thaw cycles. GM (1,3) was proven as an effective prediction model to perform better in prediction accuracy compared to GM (1,2).

Durability Test Research of Asphalt Mixture with Rubber Particles under the Condition of Freeze-Thaw Cycle

2014 ◽  
Vol 919-921 ◽  
pp. 1096-1099 ◽  
Author(s):  
Hong Yu Xu ◽  
Song Yang Dang ◽  
De Yong Cui
Keyword(s):  
Tensile Strength ◽  
Void Fraction ◽  
Rubber Particle ◽  
Asphalt Mixture ◽  
Splitting Tensile Strength ◽  
Particle Content ◽  
Freeze Thaw ◽  
Thaw Cycle ◽  
Rubber Particles ◽  
Freeze Thaw Cycle

Influence of freeze-thaw cyclic on the durability of asphalt mixture with rubber particles was researched by experiment. Based on the typed AC-13 continuous dense graded aggregate, adding the amount of 1%~3% of rubber particles into graded aggregate, the splitting tensile strength and the void fraction of asphalt mixture with rubber particles under the condition of freeze-thaw cycle were measured. The test results show that the splitting tensile strength decreases and the void fraction increases with the increase of the number of freeze-thaw cycle. With the increase of rubber particle content, the splitting tensile strength decreases and the void fraction increases under the same number of freeze-thaw cycle. When rubber particles are added to graded aggregate, the splitting tensile strength of asphalt mixture is reduced to some extent. And when the rubber particle content attains 2%, the TSR (tensile strength ratio) achieves the optimal value.

Experimental Study on Water Stability of Asphalt Mixture

2011 ◽  
Vol 266 ◽  
pp. 135-138 ◽  
Author(s):  
Yu Qing Yuan ◽  
Dan Ying Gao ◽  
Jun Zhao ◽  
Ji Yu Tang ◽  
Shao Hua Zhai
Keyword(s):  
Experimental Study ◽  
Tensile Strength ◽  
Asphalt Mixture ◽  
Splitting Tensile Strength ◽  
Water Stability ◽  
Freeze Thaw ◽  
Residual Stability ◽  
Marshall Stability

To improve water stability, we mixed asphalt mixture with cement, slag micro powders and lignin fibers, respectively. The Marshall immersion and freeze-thaw splitting tests were carried out. It is shown that cement replacing mineral powders can improve the water stability of asphalt mixture, especially at the content of 1/3 mineral powders, with a Marshall stability of 11.50 kN and a soaking residual stability of 92.46%, increasing by 10.79% and 6.58%, respectively, than those without any cement. According to the results of cement replaced by slag micro powders, its stability increases by 1.38kN, and the soaking residual stability is 90.64%, but the freeze-thaw splitting tensile strength slightly decreases. It is indicated that the water stability of the asphalt mixture can be improved by adding 0.3% lignin fibers, the soaking residual stability increasing from 86.75% to 97.41% and the ratio of freeze-thaw splitting tensile strength rising from 60.94% to 80.29%. It is concluded that the best effect can be reached by adding 0.3% lignin fibers.

Experiment on the Mechanical Performance of Fiber Lightweight Aggregate Concrete after Freeze-Thaw and Elevated Temperature

2014 ◽  
Vol 919-921 ◽  
pp. 1790-1793 ◽  
Author(s):  
Bo Cheng ◽  
Jing Huang ◽  
Wen Ting Jiang ◽  
Jian Min Wang
Keyword(s):  
Tensile Strength ◽  
Compressive Strength ◽  
Room Temperature ◽  
Mechanical Performance ◽  
Lightweight Aggregate ◽  
Splitting Tensile Strength ◽  
Lightweight Aggregate Concrete ◽  
Polyacrylonitrile Fiber ◽  
Aggregate Concrete ◽  
Freeze Thaw

Experiment on the compressive strength and splitting tensile strength of fiber lightweight aggregate concrete (FLWAC) after freeze-thaw cycling and high temperature was tested through blending polyvinyl alcohol fiber (PVAF) and polyacrylonitrile fiber (PANF) in aggregate concrete respectively. Five temperature levels, room temperature, 200°C, 400°C, 600°Cand 800°C were selected to heat the FLWAC test blocks after 25 times of freeze-thaw cycling. The micro-structure of FLWAC was observed through SEM. The experiment results show that, the cubic compressive strength of FLWAC is improved when the temperature is above 200°C, and the splitting tensile strength of FLWAC is obviously improved between the ranges from room temperature to 600°C. Blending fiber can weaken the brittle fracture performance of LWAC after freeze-thaw cycling at the peak loading state. However, the mass loss doesn’t have obvious improvement before and after 25 number of freeze-thaw cycling.

scholarly journals Research of Method for Improving Antifreeze-Thaw Performance Based on Asphalt Mixture Freeze-Thaw Damage Development Process

2020 ◽  
Vol 2020 ◽  
pp. 1-12
Author(s):  
Yazhen Sun ◽  
Man Deng ◽  
Youlin Ye ◽  
Lin Gao ◽  
Huaizhi Zhang ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Development Process ◽  
Asphalt Mixture ◽  
Splitting Tensile Strength ◽  
Test Results ◽  
Damage Development ◽  
Seasonal Freezing ◽  
Freeze Thaw ◽  
Positive Effects ◽  
Damage Degree

To improve the antifreeze-thaw performance of asphalt pavement in the seasonal freezing regions, the temperature and the time of freeze-thaw test were redesigned based on the climatic characteristics of the regions, and the splitting tensile strength tests were carried out to determine the low-temperature performance of the asphalt mixture under the influence of the gradation and the asphalt-aggregate ratio. A mathematical model was built to investigate the freeze-thaw damage law. According to the test results of splitting tensile strength of the asphalt mixture under freeze-thaw cycles, the probabilistic damage variable of the asphalt mixture was redefined and a physical probability model was built to analyse the freeze-thaw damage. Based on the freeze-thaw damage development process and the mechanism of the asphalt mixture, the effective measures to improve the antifreeze-thaw performance were provided and demonstrated through the correlations among the damage parameters (the shape parameter α, the scale factor λ, and the gradient factor ν) and the freeze-thaw resistance of the asphalt mixture. The test results showed that the splitting tensile strength decreased with the increase of the number of the freeze-thaw cycles. With the same gradation, the splitting freeze-thaw damage degree of the asphalt mixture with 5.8% asphalt-aggregate ratio is about 6% less than others after the 18th freeze-thaw cycle. The freeze-thaw resistance increases with the asphalt-aggregate ratio. With the same asphalt-aggregate ratio, the splitting freeze-thaw damage degree of S-grade mixtures is about 11.8% higher than that of Z-grade mixtures. S-grade mixtures have positive effects on the freeze-thaw resistance. The results suggest new measures for further investigation on the design and maintenance of the asphalt mixture in the seasonal freezing regions.

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