Triaxial mechanical properties and micro mechanism of fiber-modified cement soil

2021 ◽  
Vol 14 (24) ◽  
Author(s):  
Yang Yao ◽  
Na Li ◽  
Haibo Kang ◽  
Wenjie Yu ◽  
Chen Zhang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Cement Soil

scholarly journals Construction Technology and Mechanical Properties of a Cement-Soil Mixing Pile Reinforced by Basalt Fibre

2017 ◽  
Vol 2017 ◽  
pp. 1-14
Author(s):  
Yingwei Hong ◽  
Xiaoping Wu ◽  
Peng Zhang
Keyword(s):  
Mechanical Properties ◽  
Core Sample ◽  
Strength Test ◽  
Construction Technology ◽  
Basalt Fibre ◽  
Soil Mixing ◽  
New Type ◽  
Tensile Splitting Strength ◽  
Cement Soil ◽  
Drilling Core

A new type of cement-soil mixing pile reinforced by basalt fibre is proposed for increasing the bearing capacity of cement-soil mixing piles. This work primarily consists of three parts. First, the process of construction technology is proposed, which could allow uniform mixing of the basalt fibre in cement-soil. Second, the optimal proportions of the compound mixtures and the mechanical properties of the pile material are obtained from unconfined compression strength test, tensile splitting strength test, and triaxial shear test under different conditions. Third, the reliability of the construction technology, optimal proportions, and mechanical properties are verified by testing the mechanical properties of the drilling core sample on site.

Laboratory Experimental Research on Mix Ratio Test of Cement Soil

2013 ◽  
Vol 438-439 ◽  
pp. 197-201
Author(s):  
Xian Hua Yao ◽  
Peng Li ◽  
Jun Feng Guan
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Unconfined Compressive Strength ◽  
Cement Content ◽  
Ratio Test ◽  
Curing Time ◽  
Curing Conditions ◽  
Cement Ratio ◽  
Water Cement Ratio ◽  
Cement Soil

Based on the generalization and analysis of laboratory experimental results on mix ratio, the effects of various factors such as cement content, water-cement ratio, curing time, curing conditions and types of cement on the mechanical properties of unconfined compressive strength of cement soil are presented. Results show that the unconfined compressive strength of cement soil increases with the growing curing time, and it is greatly affected by the cement content, water-cement ratio, cement types and curing time, while the effect of curing conditions is weak with a cement content of more than 10%. Moreover, the stress-strain of the cement soil responds with the cement content and curing time, increasing curing time and cement content makes the cement soil to be harder and brittle, and leads to a larger Young's modulus.

scholarly journals Mechanical Performance and Microscopic Mechanism of Coastal Cemented Soil Modified by Iron Tailings and Nano Silica

Crystals ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1331
Author(s):  
Xinjiang Song ◽  
Haibo Xu ◽  
Deqin Zhou ◽  
Kai Yao ◽  
Feifei Tao ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Mechanical Performance ◽  
Hydration Reaction ◽  
Unconfined Compression ◽  
Nano Silica ◽  
Microscopic Mechanism ◽  
Clay Particles ◽  
Soil Cement ◽  
Cement Soil

In order to explore the effect of composite materials on the mechanical properties of coastal cement soil, cement soil samples with different iron tailings and nano silica contents were prepared, and unconfined compression and scanning electron microscope tests were carried out. The results show that: (1) The compressive strength of cement soil containing a small amount of iron tailings is improved, and the optimum content of iron tailings is 20%. (2) Nano silica can significantly improve the mechanical properties of iron tailings and cement soil (TCS). When the content of nano silica is 0.5%, 1.5%, and 2.5%, the unconfined compressive strength of nano silica- and iron tailings-modified cement soil (STCS) is 24%, 137%, and 323% higher than TCS, respectively. (3) Nano silica can promote the hydration reaction of cement and promote the cement hydration products to adhere to clay particles to form a relatively stable structure. At the same time, nano silica can fill the pores in TCS and improve the compactness of STCS.

scholarly journals Research of properties of cement-soil piles of foundations of buildings and structures

2020 ◽  
Vol 24 (5) ◽  
pp. 104-108
Author(s):  
N.G. Seregin ◽  
◽  
V.I. Zaprudnov ◽  
Keyword(s):  
Mechanical Properties ◽  
Mechanical Activation ◽  
Russian Federation ◽  
Western Siberia ◽  
Physical And Mechanical Properties ◽  
Soil Types ◽  
Ground Mixture ◽  
Mixing Method ◽  
The Russian Federation ◽  
Cement Soil

The review of soil types prevailing in Western Siberia of the Russian Federation is presented. The compositions and physical and mechanical properties of soils are analyzed. Special attention is paid to loess subsidence soils. The problem of obtaining a homogeneous cement-ground mixture is formulated and set. The technological scheme of production of cement-ground piles of foundations of buildings and structures by drilling-mixing method with mechanical activation is considered. Considers methods of strengthening the loess subsidence of soils. Methods for studying the properties of cement-based piles of foundations of buildings and structures are formulated. A multi-factor experiment was conducted to evaluate the parameters that affect the properties of cement-based piles. Based on the research results, conclusions and recommendations are formulated.

Experimental Study on the Effects of Pumice Powder to Cement Soil

2013 ◽  
Vol 834-836 ◽  
pp. 706-712
Author(s):  
Yong Qin Wen ◽  
Xiang Dong Shen ◽  
Lei Niu ◽  
Ya Ping Cui
Keyword(s):  
Mechanical Properties ◽  
Experimental Study ◽  
Water Content ◽  
Soft Soil ◽  
Cement Composite ◽  
Unconfined Compression ◽  
Optimum Amount ◽  
Composite Cement ◽  
Cement Soil ◽  
Compression Resistance

With pumice as the additive agent used in cement composite soil . In order to test the strength of the composite cement soil, the unconfined compression resistance were tested in the lab with different additive quantity (4%,8%,12%,16%), different curing periods (7d,28d,60d), The results show that the strength of the composite cement soil are significantly increase with increasing curing periods , with increasing additive quantity the strength variation of the composite cement soil first added, and then reduces. there is an optimum amount 8%.The pumice powder may evidently improve the mechanical properties of soft soil which has the characteristic of rich-water content, when water content from 12% to 19%, the strength of the composite cement soil are increased about 20%.

scholarly journals Impact of Drying and Wetting Cycles on Vegetation Cement-soil Physical and Mechanical Properties

2021 ◽  
Vol 20 (4) ◽  
Author(s):  
Xudong Hu ◽  
Jiazhen Gao ◽  
Mingtao Zhou ◽  
Songtao Peng ◽  
Wennian Xu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Moisture Content ◽  
Initial Moisture Content ◽  
Meteorological Condition ◽  
Physical And Mechanical Properties ◽  
Friction Angle ◽  
Optimal Choice ◽  
The Stability ◽  
Number Of Cycles ◽  
Cement Soil

The physical and mechanical properties of the ecological slope protection substrate will be affected by long-term variation of the meteorological condition, resulting in the stability of the substrate being reduced. So an artificial substrate of vegetation cement-soil was selected as the research object to prepare specimens with the different initial moisture content of 13%, 19%, 25%, 31%, 37%, and 43%. And a series of tests are conducted to investigate the evolution of the physical and mechanical properties under drying-wetting cycling conditions. Typical results of the vegetation cement-soil evolution can be divided into three stages: cement hydration stage, shrinkage stage, and stabilization stage. In terms of different initial moisture content, the shrinkage cracks number, cracks length, crack width, and cracks surface area are increased first and then stabilize with the increase of the number of drying-wetting cycles. In contrast, the cohesion and internal friction angle of the vegetation cement-soil is reduced with the increase of the number of cycles. Comprehensive analysis shows that the initial moisture content of vegetation cement soil ranges from 25% to 31% is the optimal choice to ensure substrate stability in production practice.

The Effect of Cementation on the Mechanical Properties of Muddy Soil of East-South Coastal Area of China

2013 ◽  
Vol 740 ◽  
pp. 636-639
Author(s):  
Chao Hua Jiang ◽  
Fei Wu ◽  
Tao Wang ◽  
Ke Fan
Keyword(s):  
Mechanical Properties ◽  
Late Stage ◽  
Coastal Area ◽  
Mixing Ratio ◽  
Cement Type ◽  
Early Hydration ◽  
Increase Rate ◽  
Early Strength ◽  
Cement Soil ◽  
Better Than

Based on characteristic of the muddy soil residing in east-south coastal area of China, the effect of cement grade, cement-mixing ration and cement type on mechanical properties of cement-soil was carried out in this paper. The results show that cement-soil increases obviously with increasing of hydration age for different cement types. At early hydration age, strength of cement-soil increases quickly. And at the age of 28d~90d, strength of cement-soil still show quite obvious increasing, but increase rate is slow. Increasing cement-mixing ratio improve strength of cement-soil obviously and 0.15~0.20 cement-mixing ratio is suitable to use. Higher cement grade can bring higher strength of cement-soil. Early strength of cement-soil solidified with P.S32.5 increases slowly, but the middle and late stage strength of cement-soil solidified with P.S32.5 increase quickly. The solidification effect of P.S 32.5 is better than that of AEC32.5 and P.MSR32.5.

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