Influences of aggregate micro fines on the packing of fresh mortar and the performances of mortar

2019 ◽  
Vol 164 ◽  
pp. 493-498 ◽  
Author(s):  
Wang Yuli ◽  
He Hang ◽  
Liu Xiaoxing
Keyword(s):  
Micro Fines

Influence of the MB Value of Manufactured Sand on the Mechanical Property of Concrete

2011 ◽  
Vol 399-401 ◽  
pp. 1352-1357
Author(s):  
Wen Juan Zhou ◽  
Song Lin
Keyword(s):  
Mechanical Property ◽  
Compressive Strength ◽  
Experimental Results ◽  
Manufactured Sand ◽  
Compressive Strength Of Concrete ◽  
Early Strength ◽  
High Level ◽  
Micro Fines

In this paper, influence of micro-fines on the manufactured sand and influence of manufactured sand containing micro-fines on concrete is studied. Using the MB value of manufactured sand to control the content of micro-fines in manufactured sand. The experimental results show that if MB value is less than 1.0, content of micro-fines is less than 15%, concrete keeps a high level of compressive strength ; both the content and property of micro-fines have a certain influence on the compressive strength of concrete; the fineness of micro-fines has influence on the early strength of concrete, but little influence on the later strength of concrete.

Effects of Powdery Mill Tailings from Magnetite on Workability and Strength of Concretes

2011 ◽  
Vol 477 ◽  
pp. 233-238 ◽  
Author(s):  
Ji Wei Cai ◽  
Ji Xu Wu ◽  
Zheng Hang Lü ◽  
Guang Liang Gao
Keyword(s):  
Micro Particles ◽  
Mill Tailings ◽  
Fine Aggregates ◽  
Powder Content ◽  
Good Workability ◽  
Micro Fines

The discarded mill tailings behind the dam will cause disasters at any time. A solution to this problem may be to utilize those wastes, e.g. mill tailings from magnetite, as the Manufactured Fine Aggregates (MFA) for preparation of concretes. The mill tailings from magnetite can be considered as new resources of sand. However, in production of MFA from mill tailings, the particles smaller than 75 μm were strictly eliminated. The degranulation results in not only lower utilization of the resources but also worse micro grading of MFA. The micro fines, i.e. powdery mill tailings from magnetite, supplements powder content in concrete systems in w/c>0.40 to modify the ratio of water to total powder (w/p). The perfect micro grading for good workability can be reached in the case of optimal w/p ratio. The filling effect owing to perfect micro grading of powdery mill tailings makes concretes more compact and the pozzolanic constituents in micro particles of the tailings contribute to the strength of concretes.

Physical filling effect of aggregate micro fines in cement concrete

2013 ◽  
Vol 41 ◽  
pp. 812-814 ◽  
Author(s):  
Yuli Wang ◽  
Zuquan Jin ◽  
Suxia Liu ◽  
Lei Yang ◽  
Shuqiong Luo
Keyword(s):  
Cement Concrete ◽  
Micro Fines

scholarly journals Effects of Aggregate Micro Fines (AMF), Aluminum Sulfate and Polypropylene Fiber (PPF) on Properties of Machine-Made Sand Concrete

2019 ◽  
Vol 9 (11) ◽  
pp. 2250 ◽  
Author(s):  
Hang He ◽  
Yuli Wang ◽  
Junjie Wang
Keyword(s):  
Compressive Strength ◽  
Aluminum Sulfate ◽  
Polypropylene Fiber ◽  
Test Method ◽  
Polypropylene Fibers ◽  
Chloride Permeability ◽  
River Sand ◽  
Permeability Coefficients ◽  
Increasing Demand ◽  
Micro Fines

With the depletion and increasing demand of river sand, machine-made sand could be used more and more in concrete. In order to improve the properties of machine-made sand concrete, the effects of the aggregate micro fines (AMF) content, aluminum sulfate, and polypropylene fibers (PPF) on the slump, compressive strength, water permeability, and the chloride permeability coefficients were investigated through a single factor test method, and related mechanisms were analyzed. The results show that the optimum contents of AMF, aluminum sulfate, and the polypropylene fiber are 10 wt%, 1 wt%, and 0.6 kg/m3, respectively. The optimum content of AMF improved the compactness of concrete. The addition of aluminum sulfate promoted the initial formation of ettringite, and thereby improved the compressive strength and the permeability resistance. The polypropylene fiber can modify the pore structure distribution of concrete and reduce the porosity, thereby improving the impermeability of the concrete. The compressive strength of the machine-made sand concrete could be increased by more than 20%, and the water/chloride permeability coefficients could be decreased by more than 45%.

Influence of the Fineness of Micro-Fines on the Performance of Cement and Mortar

2011 ◽  
Vol 477 ◽  
pp. 102-107 ◽  
Author(s):  
Wen Juan Zhou ◽  
Wei Niu ◽  
Jia Long Chen ◽  
Gui Bin Ji
Keyword(s):  
Pore Structure ◽  
Rapid Development ◽  
Setting Time ◽  
Water Requirement ◽  
Experimental Results ◽  
Natural Sand ◽  
Effective Use ◽  
Technical Basis ◽  
Sand Source ◽  
Micro Fines

With the rapid development of fundamental construction, natural sand resources is getting less and less, artificial sand has become a new kind of sand source. Artificial sand’s production can produce a certain amount of aggragate micro-fines, rational use of micro-fines will be an important factor about affecting application of artificial sand. In this paper，impact of fineness and volume of artificial sand on cement and mortar performance is studied systematically, provides technical basis for the effective use of micro-fines. The experimental results show that micro-fines decreases water requirement of normal consistency and shorten setting time of cement, appropriate fineness micro-fines will reduce water requirement, improve strength, less shrinkage of mortar. The pore structure results show, finer micro-fines refines the pore structure, reduces the porosity of mortar.

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