Strength properties and variance of cement-treated ground using the pneumatic flow mixing method

The experiment aims to test the triple mixing (3M) technique to produce the concrete with recycled concrete aggregate (RCA). Then, the impact prolonged mixing, representing the influence of delivery and discharge time in praxis, is analysed by the change in strength properties. Both the 28-day compressive strength and tensile splitting strength are evaluated in two aspects: the prolonged mixing time (0, 45 and 90 min after initial mixing), and the mixing method (normal and triple). Prolonged mixing time brought both the positive and negative changes in strength characteristics however the worst difference between initial mixing (0′) and 90′ minutes of mixing was only 8.4% for compressive strength and 8.5% for tensile splitting strength.

Download Full-text

Development of a Circulated Flow Mixing Method with a Tubular Crystallizer for Controlling Indomethacin Polymorphs

JOURNAL OF CHEMICAL ENGINEERING OF JAPAN ◽

10.1252/jcej.16we312 ◽

2017 ◽

Vol 50 (7) ◽

pp. 501-510

Author(s):

Masashi Furuta ◽

Jumpei Katayama ◽

Taisuke Maki ◽

Kazuhiro Mae

Keyword(s):

Flow Mixing ◽

Mixing Method

Download Full-text

Relationships Between Mixing Method, Microstructure and Strength of Nr:Br Blends

Rubber Chemistry and Technology ◽

10.5254/1.3547636 ◽

2001 ◽

Vol 74 (1) ◽

pp. 1-15 ◽

Cited By ~ 13

Author(s):

J. Clarke ◽

B. Clarke ◽

P. K. Freakley

Keyword(s):

Process Development ◽

Strength Properties ◽

Single Stage ◽

Tear Strength ◽

Mixing Method ◽

Stage Process ◽

Filler Dispersion ◽

Mixing Techniques ◽

High Degree ◽

Filler Distribution

Abstract Much published literature on the way in which phase morphology and filler distribution affect blend properties is contradictory or confusing. Experiments were carried out to elucidate the relationships and to determine whether the use of compatibilizers or special mixing techniques might have a beneficial effect on natural rubber:butadiene rubber (NR:BR) blend properties. NR:BR blends were prepared using both a masterbatch method and a single-stage mixing method. A cure system which gave an even distribution of crosslinks between the phases was used. The morphology, tensile strength and tear strength properties of the blends were measured. Results indicated a high degree of compatibility with fine textured blends (domain sizes < 1µm) being quickly and easily produced, even from masterbatches of very different viscosities. Strength properties of these fine textured masterbatch blends could be predicted by applying the simple rule of mixtures to properties of individual compounds mixed under the same conditions. Although in particular situations a coarse morphology could result in high tear resistance values, for most applications a fine textured morphology gives the most satisfactory overall tensile and tear strength properties. For blends mixed in a single-stage process, development of a fine textured morphology was much quicker than that of filler dispersion. For NR:BR blends containing an optimum cure system it was concluded that the mixing cycle should be chosen to optimize filler dispersion and that use of a compatibilizer will not significantly shorten the mixing cycle or improve the properties of the blend.

Download Full-text

Experimental investigations of using deep mixing method to stabilise problematic clays in Ontario

10.32920/ryerson.14657301 ◽

2021 ◽

Author(s):

Shuihan Li

Keyword(s):

Shear Strength ◽

Strength Properties ◽

Undrained Shear Strength ◽

Experimental Investigations ◽

Silty Clay ◽

Slag Cement ◽

Mixing Method ◽

Sensitive Marine Clay ◽

Strength Improvement ◽

Undrained Shear

Champlain Sea clay is a sensitive marine clay which can lose more than 90% of its strength when disturbed. Organic silty clay, commonly found in Ontario, has a high compressibility and a low shear strength. In this experimental study, different binders were applied to Champlain Sea clay and organic silty clay to improve its strength properties. The results indicate that cement and slag/cement can significantly improve the strength of these problematic clays. A cement dosage ranging from 150 kg/m3 to 250 kg/m3 can consistently improve the undrained shear strength of Champlain Sea clay and organic silty clay with the maximum strength improvement ratio of 10 and 18 respectively. A slag/cement dosage of 290 kg/m3 with a mass ratio of 3:1 can improve the undrained shear strength of Champlain Sea clay for more than 50 times. Lime was found to be effective in treating organic silty clay as well.

Download Full-text