Experimental Study of the Effect of Early Strength Admixture on Cement Stabilized Macadam Material

2014 ◽  
Vol 1004-1005 ◽  
pp. 1508-1511
Author(s):  
Yun Lian Song ◽  
Kai Liu ◽  
Min Lin ◽  
Peng Liu
Keyword(s):  
Experimental Study ◽  
Compressive Strength ◽  
Unconfined Compressive Strength ◽  
Base Material ◽  
Project Design ◽  
Construction Period ◽  
Logarithmic Curve ◽  
Early Strength

5% cement was mixed into the cement stabilized macadam base material, then the cement was replaced by SES-I early strength admixture according to the amount of cement (mass ration) which was 0%, 8%, 10%, 12%, 14% and 16%. The unconfined compressive strength Rc of cement stabilized macadam material was tested during different curing periods 12h, 1d, 2d, 3d, 7d and 28d. Depending on the experimental date, the effect of early strength admixture on cement stabilized macadam material was investigated, and the logarithmic curve relationship can be fitted between the SES-I admixture and Rc. The experiment result shows that the 14% dosage of early strength agent is the best result for material early strength, and it also provides the foundation to increase early strength and shorten the construction period for meeting the project design demand.

scholarly journals Experimental Study on Improvement of Marine Soft Soil with Alkali Residue

2018 ◽  
Vol 53 ◽  
pp. 04021
Author(s):  
SHAO Yong ◽  
LIU Xiao-li ◽  
ZHU Jin-jun
Keyword(s):  
Experimental Study ◽  
Compressive Strength ◽  
Unconfined Compressive Strength ◽  
Void Ratio ◽  
Soft Soil ◽  
Compressive Modulus ◽  
Engineering Properties ◽  
Test Results ◽  
Use Of Resources ◽  
One Year

Industrial alkali slag is the discharge waste in the process of alkali production. About one million tons of alkali slag is discharged in China in one year. It is a burden on the environment, whether it is directly stacked or discharged into the sea. If we can realize the use of resources, it is a multi-pronged move, so alkali slag is used to improve solidified marine soft soil in this paper. The test results show that the alkali residue can effectively improve the engineering properties of marine soft soil. Among them, the unconfined compressive strength and compressive modulus are increased by about 10 times, and the void ratio and plasticity index can all reach the level of general clay. It shows that alkali slag has the potential to improve marine soft soil and can be popularized in engineering.

scholarly journals Road performance analysis of cement stabilized coal gangue mixture

2021 ◽  
Author(s):  
Zhenxia Li ◽  
Tengteng Guo ◽  
Yuan Zhao Chen ◽  
Xu Zhao ◽  
Yanyan Chen ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Compressive Strength ◽  
Unconfined Compressive Strength ◽  
Optimal Allocation ◽  
Spontaneous Combustion ◽  
Base Material ◽  
Coal Gangue ◽  
Stone Materials ◽  
Road Performance ◽  
Dry Shrinkage

Abstract In order to solve the environmental pollution of coal gangue and the shortage of aggregate resources in road engineering, waste coal gangue is used as road base material instead of natural stone materials. Through physical, mechanical, chemical and activity tests of coal gangue aggregate, the optimal gradation composition of unconfined compressive strength was determined. Through unconfined compressive strength, indirect tensile strength, flexural tensile strength, freeze-thaw and dry shrinkage tests, the influence of cement content on road performance of cement stabilized coal gangue mixture was studied. By means of SEM, ICP AES, XRD and optical digital microscope, the difference between spontaneous combustion coal gangue and Unspontaneous combustion coal gangue was analyzed, the microstructure of cement stabilized coal gangue mixture was characterized, and the strength formation mechanism of mixture was explored. The results show that Spontaneous combustion coal gangue has higher activity than Unspontaneous combustion coal gangue.Based on the selected optimal allocation（BNS:SNS:SSC =71.26:9.41:18.8）,The mixture of 4% cement dosage can not only meet the requirement of early strength 4.16 MPa, but also show an efficient strength growth rate of 36.10%, showing the optimum mechanical properties. The total shrinkage coefficient of cement stabilized coal gangue mixture with 4% cement dosage is 1.12×10-2, which shows that the dry shrinkage resistance is the best. With the increase of time, hydration degree is gradually deepened, and gelled substance is more tightly bonded to aggregates. There is no obvious gap between aggregates, and the integrity of the mixture is enhanced, which can show better road performance. Ca (OH)2, a cement hydration product in cement stabilized coal gangue mixture, takes place pozzolana reaction with active SiO2 and Al2O3 in coal gangue to produce gismondine, which is beneficial to the global strength and the bond quality of the mixture.

Research on the Mechanical Performance of the Road Base Materials with Steel Slag Sand

2012 ◽  
Vol 174-177 ◽  
pp. 676-680
Author(s):  
Fang Xu ◽  
Ming Kai Zhou ◽  
Jian Ping Chen
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Unconfined Compressive Strength ◽  
Mechanical Performance ◽  
Steel Slag ◽  
Base Material ◽  
Strength Performance ◽  
The Road ◽  
Road Base ◽  
Base Materials

The unconfined compressive strength is used to be the valuation index, the mechanical performance of three kinds of new road base material, which are fly ash stabilized steel slag sand (FA-SS for short), lime and fly ash stabilized steel slag sand (L-FA-SS for short), cement and fly ash stabilized steel slag sand(C-FA-SS for short), are studied in this paper. The results show that the unconfined compressive strength performance of FA-SS is similar to L-FA-SS, and it can meet the highest strength when the ratio of steel slag to fly ash is 1:1~2:1. When the ratio of fly ash to the steel slag is 10:90, it is good to use cement stabilizing. Comparing the new road base materials with the traditional road base material, the former has better strength performance and economy function advantage.

scholarly journals ESTABILIZAÇÃO DE UM SOLO DA CAMADA CINZA DA FORMAÇÃO GUABIROTUBA PARA FINS DE PAVIMENTAÇÃO URBANA EM CURITIBA, BRASIL

2020 ◽  
Vol 12 (1) ◽  
pp. 39-52
Author(s):  
Jair de Jesús Arrieta Baldovino ◽  
Ronaldo Luis dos Santos Izzo
Keyword(s):  
Experimental Study ◽  
Compressive Strength ◽  
Unconfined Compressive Strength ◽  
Sedimentary Basin ◽  
Cement Content ◽  
Dry Mass ◽  
Curing Time ◽  
Cement Ratio ◽  
Semi Empirical ◽  
The City

The Guabirotuba Formation is located over the sedimentary basin of the city of Curitiba (Brazil). The gray layer of the Formation extends from 1 to 50 m deep. Although it is the most characteristic layer of the Formation, there are no studies of stabilization of these soils for urban paving purposes inthe city. Thus, this paper presents an experimental study of the stabilization of gray silt soil with Portland cement (PC) using cure times (t) of 7, 14, and 28 days. Cement contents (C) of 3, 5, 7, and 9% in relation to soil dry mass were used. After cure times, unconfined compressive strength (qu) and durability tests were performed using wet/dry cycles (W/D). The results show an increase of quwith increasing cement content, increasing molding density and increasing curing time. In addition, the durability of the mixtures increased when more cement was added. It was found that the values of quare dependent on the semi-empirical porosity/cement ratio (η/Civ). Finally, 5% is the minimum cement content for using the soil in paving purposes.

Unconfined compressive strength of various types of pavement base material: A review

2020 ◽  
Author(s):  
Liyana Ahmad Sofri ◽  
Mohd Mustafa Al Bakri Abdullah ◽  
Mohd Rosli Mohd Hasan ◽  
Yue Huang ◽  
Muhammad Faheem Mohd Tahir ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Unconfined Compressive Strength ◽  
Base Material ◽  
Pavement Base

Application of Fractal Theory on the Cement Stabilized Recycled Course Aggregate Base Material

2013 ◽  
Vol 639-640 ◽  
pp. 389-393
Author(s):  
Jian Yin ◽  
Yi Chi ◽  
Wei Min Song
Keyword(s):  
Particle Size ◽  
Compressive Strength ◽  
Fractal Dimension ◽  
Unconfined Compressive Strength ◽  
Coarse Aggregate ◽  
Fractal Theory ◽  
Base Material ◽  
Recycled Aggregate ◽  
Material Strength ◽  
Recycled Coarse Aggregate

This paper studied different size-distribution of recycled coarse aggregates by fractal theory. Cement Stabilized Recycled Aggregate Mixture were prepared by different fractal rate aggregate gradations and the unconfined compressive strength at 7 d and 28 d of the materials were tested. The results showed that the unconfined compressive strength at 7 d and 28 d of the materials with recycled coarse aggregate were higher than the one with natural aggregate when coarse aggregate gradations were same. The higher source rock strength of recycled coarse aggregate was, the larger base material strength was. Generally, the increase of fractal dimension is conducive to the growth of strength. The base materials performances of the same fractal dimension were different when the max particle size was different. So the fractal dimension of recycled coarse aggregate must be determined by maximum particle size.

Experimental study on the strength of silty soft soil in beach with polypropylene fiber reinforcement

2020 ◽  
pp. 10-17
Author(s):  
Qi Daozheng ◽  
Gu Cong ◽  
Fu Jiajia ◽  
Wang Yao
Keyword(s):  
Experimental Study ◽  
Compressive Strength ◽  
Shear Strength ◽  
Internal Friction ◽  
Unconfined Compressive Strength ◽  
Fiber Length ◽  
Soft Soil ◽  
Polypropylene Fiber ◽  
Fiber Reinforcement ◽  
Fiber Content

The effects of polypropylene fiber reinforcement on shear strength and unconfined compressive strength of silty soft soil in tidal flats were studied. Through shear test and unconfined compression test, Experimental study was conducted on silty soft soil of allene fiber reinforced beach with 0~0.6% different mass content and 3 ~18m different length. The failure process and mechanism of fiber reinforced soil samples were also discussed. The test results show that: Shear strength (cohesion and internal friction Angle) and unconfined compressive strength increased rapidly in the early stage with the increase of fiber content, and gradually decreased after reaching the peak at a certain content. In this test, the optimal fiber length corresponding to shear strength is 9mm. When the content is less than 0.6%, the optimal content of cohesion is about 0.2%, and the optimal content corresponding to the Angle of internal friction is between 0.2% and 0.3%. Within the range of 18mm fiber length in the experimental study, unconfined compressive strength increased with the increase of fiber length, and the optimal fiber content corresponding to unconfined compressive strength was 0.2%. The main effects of polypropylene fiber reinforcement on soil cohesion and unconfined compressive strength are not obvious.

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