Research about the Effect of Polypropylene Fiber on Mechanical Properties of Curing Sludge

2011 ◽  
Vol 250-253 ◽  
pp. 788-794
Author(s):  
Shu Lin Zhan ◽  
Shu Sen Gao ◽  
Jun Ying Lai
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Shear Strength ◽  
Water Content ◽  
Unconfined Compressive Strength ◽  
Polypropylene Fiber ◽  
Physical And Mechanical Properties ◽  
Curing Time ◽  
Strength Tests ◽  
Different Content

In order to study the influence of modified polypropylene (PP) fiber on the physical and mechanical properties of curing sludge, the same amount of cement and different content of polypropylene fiber were mixed into the sludge. Unconfined compressive strength tests, water content tests and shear strength tests were carried out on different specimens with different curing time. The results show that the sludge curing effect is markedly improved by the addition of the polypropylene fiber. As to the curing sludge with the same curing time, when the content of the polypropylene fiber increases, the unconfined compressive strength and the cohesive strength greatly increase, and the internal frictional angle decreases.

scholarly journals Physical and Mechanical Properties of Cemented Soil Fill At Liquid and Hardened States

2022 ◽  
Vol 2148 (1) ◽  
pp. 012066
Author(s):  
Cheng Shi ◽  
Jinghu Ding ◽  
Junjie Chen ◽  
Fangzhou Chu
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Unconfined Compressive Strength ◽  
Physical And Mechanical Properties ◽  
Construction Site ◽  
Cemented Soil ◽  
Strength Tests ◽  
Strength And Stiffness ◽  
Liquid Property ◽  
Fill Materials

Abstract Cemented soil fill is a new backfilling technology developed for the problems of narrow foundation trenches and uncompacted backfilling. It has good fluidity before solidification and higher strength and stiffness after solidification. This type of fill materials makes full use of the waste soils. The proportioning test was carried out on excavated soil on a construction site. Liquid property tests and unconfined compressive strength tests was carried out. The results show that the cemented soil fill can meet the requirement of foundation trenches backfilling, which has great prospect for future applications.

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 Influence of Solid Content, Cement/Tailings Ratio, and Curing Time on Rheology and Strength of Cemented Tailings Backfill

Minerals ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 922
Author(s):  
Jiajian Li ◽  
Erol Yilmaz ◽  
Shuai Cao
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Rheological Properties ◽  
Flow Rate ◽  
Unconfined Compressive Strength ◽  
Solid Content ◽  
Similar Type ◽  
Curing Time ◽  
Flow Process ◽  
Resistance Loss

Understanding the flow process of cemented tailings backfill (CTB) is important for successful pumping into underground stopes. This study examines the effects of solid content (SC), cement/tailings (c/t) ratio, and curing time (CT) on rheological and mechanical properties of CTB mixes. The slurry concentration of the mixes was 65, 67, and 69 wt. %, with c/t ratios ranging from 1:4 to 1:20. Unconfined compressive strength (UCS) tests were performed on hardened CTB mixes after curing 3, 7, and 28 days. The rheological properties of CTB slurries are mainly related to SC. The yield stress and viscosity of fresh mixes increase with increasing SC, but the pipeline resistance loss (PRL) also increases with increasing SC. According to the analysis of variance, the SC and flow rate are the most significant parameters which greatly affect the PRL performance. The c/t and CT parameters are the most significant parameters for affecting the shrinkage rate. The findings offer a reference for theoretical optimization for mine filling systems of similar type.

Effect of humic acid on the behaviour of solidified dredged material

2009 ◽  
Vol 46 (9) ◽  
pp. 1093-1099 ◽  
Author(s):  
Wei Zhu ◽  
C. F. Chiu ◽  
Chun-Lei Zhang ◽  
Ke-Lin Zeng
Keyword(s):  
Compressive Strength ◽  
Humic Acid ◽  
Water Content ◽  
Acid Content ◽  
Unconfined Compressive Strength ◽  
Bound Water ◽  
Dredged Material ◽  
Curing Time ◽  
Unconfined Compression ◽  
Bound Water Content

Unconfined compression and bound-water content tests were conducted to study the effect of humic acid on the mechanical behaviour of solidified dredged material. It is found that the unconfined compressive strength (qu) and the change in bound-water content (Δmbw) exhibit similar relationships with the humic-acid content and curing time. Both parameters decrease with an increase in humic-acid content until reaching a threshold humic-acid content, above which the magnitudes of both parameters reduce to relatively low and steady values. In addition, both qu and Δmbw increase nonlinearly with the curing time. A relationship between qu and Δmbw is presented; Δmbw may reflect the extent of the hydrates developed in the solidified soil which increases nonlinearly with qu.

Testing Research of Physical and Mechanical Properties of Snows on Railroad Switch

2013 ◽  
Vol 380-384 ◽  
pp. 4387-4390 ◽  
Author(s):  
Cun Yuan Mu ◽  
Bo Feng ◽  
Ming Ge Sui ◽  
An Min Wang
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Ambient Temperature ◽  
Conservation Status ◽  
Physical And Mechanical Properties ◽  
Quality Parameters ◽  
Snow Density ◽  
Strength Tests ◽  
Railway Turnout

The conservation status of the railway turnout junctions were analyzed, the hardness, density, compressive strength tests of snow squeezed by railway turnout junctions were studied, thus reaching a conclusion that different quality of snow owns different hardness and densities. For new snow ( or loose snow) whose density ρ = 0.3g/cm2, snow compressive strength is small; when the compacted snow density ρ > 0.3g/cm2, the regulation of snow compressive strength should be the snow compressive strength improve with decreasing temperature, while the denser the snow density is and the lower ambient temperature is, the faster the snow increase compressive strength. All these provided the snow quality parameters for the design of railway turnout junction snow cleaning machines and tools.

Application of New Soil Consolidator in Road-Construction Engineering

2012 ◽  
Vol 238 ◽  
pp. 466-469
Author(s):  
Hong Zhang ◽  
Dong Liang Xun ◽  
Zhao Yang ◽  
Fu Quan Ji
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Physical And Mechanical Properties ◽  
Road Construction ◽  
Point Of View ◽  
Curing Time ◽  
Construction Engineering ◽  
Geological Conditions ◽  
Silt Layer

This paper contrastively analyses the consolidation instances of silt with HEC and HAS soil consolidators, also emphatically discusses the influence regularities of the compressive strength of solidified soil with the following factors: the dose of consolidators and the curing time. Meanwhile, from the point of view of experiment, this paper studies the physical and mechanical properties of solidified soil. Case study shows that HEC and HAS soil consolidators behave as well as cement and lime in road-construction engineering, and even that filling subgrade independently. Also, this paper proposes the appropriate value 6% of HEC and HAS soil consolidators for solidifying silt layer, which can be used as reference for the similar geological conditions.

scholarly journals Mechanical Properties of Polypropylene Fiber Cement Mortar under Different Loading Speeds

2021 ◽  
Vol 13 (7) ◽  
pp. 3697
Author(s):  
Hui Chen ◽  
Xin Huang ◽  
Rui He ◽  
Zhenheng Zhou ◽  
Chuanqing Fu ◽  
...  
Keyword(s):  
Experimental Data ◽  
Mechanical Properties ◽  
Compressive Strength ◽  
Flexural Strength ◽  
Relative Error ◽  
Cement Mortar ◽  
Polypropylene Fiber ◽  
Experimental Results ◽  
Strength Tests ◽  
Sample Age

In this work, the relationships between the mechanical properties (i.e., compressive strength and flexural strength) and loading speed of polypropylene fiber (PPF)-incorporated cement mortar at different ages (before 28 days) were studied. A total of 162 cubic samples for compressive strength tests and 162 cuboid samples for flexural strength tests were casted and tested. Analytical relationships between the sample properties (i.e., sample age, PPF content, and loading speed) and compressive and flexural strength were proposed based on the experimental data, respectively. Of the predicted compressive and flexural strength results, 70.4% and 75.9% showed less than 15% relative error compared with the experimental results, respectively.

scholarly journals Stiffness and Strength of Granular Soils Improved by Biological Treatment Bacteria Microbial Cements

2018 ◽  
Vol 2 (4) ◽  
Author(s):  
Mehdi Jalili ◽  
Mohmad Reza Ghasemi ◽  
Ali Reza Pifloush
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Uniaxial Compressive Strength ◽  
Physical And Mechanical Properties ◽  
Soil Improvement ◽  
Granular Soils ◽  
Industrial Town ◽  
Strength Tests ◽  
Problematic Soils ◽  
Strength And Stiffness

In some parts of the world mechanical properties of problematic soils are not suitable for construction purposes. Today, regard to the importance of the soil improvement; by considering methods with more concordance with the environmental mechanisms in the nature, and with study and combination of geotechnical science, microbiology and geochemistry; researchers try to provide a suitable way to improve the physical and mechanical properties of the problematic soils. In this paper, the effect of the aerobic microorganisms of Sporosarsina Pasteurii (PTCC 1645), as a producer of Urease for the sedimentation of calcium carbonate and improvement of granular soil of Garmsar Industrial Town is evaluated experimentally in order to check the effects of this phenomena on the shear strength and stiffness of the granular soils. The results of the uniaxial compressive strength tests show the effect of adding the above mentioned microbial solution to the soils, in case of increased uniaxial compressive strength and stiffness of the soil. It should be mentioned that the granular soils have no compressive strength, naturally but after bio cementation the samples got notable values.

Laboratory Study of Engineering Properties of Flowable Backfill Material

2014 ◽  
Vol 955-959 ◽  
pp. 2809-2812
Author(s):  
Zhang Hong ◽  
Guo Chao ◽  
Li Liang ◽  
Zhi Qiang Liu
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Water Content ◽  
Unconfined Compressive Strength ◽  
Cement Content ◽  
Engineering Properties ◽  
Cleavage Strength ◽  
The Common ◽  
Common Problems ◽  
Content Range

Aimed at the common problems of small backfill space, hard to backfill, difficult to guarantee compaction quality in engineering, development law of fluidity and mechanical properties (unconfined compressive strength and cleavage strength) is analyzed by changing mix ratio of cement, fly ash and water. Fluidity is mainly controlled by water content. Range of fluidity is significantly different when water content is around 60％.Considering the effect of economy and strength, 4% cement content will be recommended.

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.

Sign in / Sign up

Export Citation Format

Share Document