The Frost Resistance of LYTAG Concrete

2014 ◽  
Vol 936 ◽  
pp. 1419-1422
Author(s):  
Ai Lian Zhang ◽  
Lin Chun Zhang
Keyword(s):  
Fly Ash ◽  
Silica Fume ◽  
Frost Resistance ◽  
Interfacial Transition Zone ◽  
Test Method ◽  
Mineral Admixture ◽  
Cement Stone ◽  
Normal Density ◽  
Ordinary Concrete ◽  
Better Than

This article studies the frost resistance of LYTAG concrete and ordinary concrete respectively used the RILEM recommended test method (CIF) about frost resistance of concrete. The results indicate that the single surface's frost resistance of Lytag concrete with mineral admixture is much better than normal density concrete's. And the rank of the single surface's frost resistance at 56 cycles of Lytag concrete with different mineral admixture is: silica fume and slag> silica fume and fly ash>slag and fly ash>silica fume>fly ash>slag. The important reasons why LYTAG concrete has good frost resistance is that the scope of blending interfacial transition zone of LYTAG concrete between aggregate ceramsite and cement stone was significantly smaller than ordinary concrete.

scholarly journals Effects of active mineral admixture on mechanical properties and durability of concrete

2021 ◽  
Author(s):  
Chen Xupeng ◽  
Sun Zhuowen ◽  
Pang Jianyong
Keyword(s):  
Fly Ash ◽  
Silica Fume ◽  
Mechanical Performance ◽  
Mineral Admixture ◽  
Control Group ◽  
Concrete Durability ◽  
Destructive Effect ◽  
Ordinary Concrete ◽  
Positive Effects ◽  
Optimal Mix

Abstract the purpose of this study is to figure out the effects of the active mineral admixture on the mechanical performance and the durability of the concrete. In this paper, the orthogonal test is adopted to study the effects of the Metakaolin, the ultra-fine fly ash, and the silica fume on the compressive strength and the splitting tensile strength of the concrete at various curing ages, and to further determine the optimal mix ratio. After that, the ordinary concrete is taken as the control group, the Na2SO4 solution and the MgSO4+NaCl solution are taken as the corrosive medium, and the dry-wet alternation method is used to make comparison and micro-analysis on the durability degradation processes of both the admixture concrete with optimal mix ratio and the ordinary concrete in the two solutions as mentioned above. The results show that: as for the concrete mechanical performance, the Metakaolin shows the biggest positive effects on the concrete cured for 7d-14d, while the silica fume affects the concrete with 28d curing age most. The mechanical performance of concretes at various curing ages reach their optimal levels under the conditions of being added with 10% Metakaolin, 15% ultra-fine fly ash, and 3% silica fume. For the concrete durability, the way of adding mineral admixture could greatly improve the concrete capability in resisting the SO4 2- corrosion. However the complex ion has destructive effect on the mineral admixture concrete. Compared with the ordinary concrete, it shows the most significant growth of corrosion product M-S-H, faster reduction of mechanical performance, and loose and porous micro-structure.

scholarly journals Study on the Mechanical Properties and Frost Resistance of Multiple Modified Concrete

2021 ◽  
Author(s):  
Xiaosa Yuan ◽  
Li Zhang ◽  
Xinxiao Chen ◽  
Fang Liu
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Fly Ash ◽  
Frost Resistance ◽  
Steel Fiber ◽  
Freeze Thaw ◽  
Ordinary Concrete ◽  
Compressive Strength Of Concrete ◽  
Better Than ◽  
Mixed Concrete

Abstract To study the effects of graphene oxide (GO), fly ash, and steel fiber on the mechanical properties and durability of concrete, the mechanical properties, frost resistance, and internal pore structure of modified concrete are investigated by compression tests, freeze–thaw cycle tests, and industrial computed tomography (CT) tests. The test results show that the compressive strength of concrete with GO is better than that of mixed concrete, concrete mixed with only steel fiber, and ordinary concrete. Further, it is strongest at all ages when the GO content is 0.03%; the compressive strength of mixed concrete with 30% of fly ash is generally better than that with 15% and 45% of fly ash. In general, the frost resistance of concrete with only GO is better than that of ordinary concrete. With the increase in fly ash content, the internal porosity of concrete decreases, and its compressive strength increases accordingly; as GO increases, the porosity decreases and then increases, with the lowest porosity and the highest compressive strength of concrete at 0.03% of GO. With an increase in porosity, the mass loss and relative dynamic elastic modulus of concrete increase after 100 freeze–thaw cycles, which indicates that porosity directly affects the frost resistance of concrete.

Production and engineering application of C60 high-performance pump pebble concrete containing ultra-fine fly ash

2008 ◽  
Vol 35 (8) ◽  
pp. 757-763 ◽  
Author(s):  
Ying Li Gao ◽  
Bao Guo Ma ◽  
Shi Qiong Zhou
Keyword(s):  
Fly Ash ◽  
High Performance ◽  
Engineering Application ◽  
Chloride Ion ◽  
Test Method ◽  
Ordinary Concrete ◽  
Second Stage ◽  
Chloride Ion Penetration ◽  
Engineering Requirement ◽  
Better Than

C60 grade high-performance pump concrete incorporating river pebbles and ultra-fine fly ash (UFA) was successfully prepared, with UFA replacing 30% of the cement, for the second-stage of construction of the Hunan Xiangtan Power Plant. Some of the properties of this pump concrete were studied using both laboratory and on-site testing. The results indicated that workability of UFA concrete was excellent. The initial slump surpassed 180 mm, and the slump loss was small. The 28 d strength of the concrete met the engineering requirement of conforming to C60 strength grade. It is shown that the resistance–chloride ion penetration of UFA pump concrete is better than that of ordinary concrete in terms of Association for Testing and Materials test method C1202-94. Dry shrinkage of concrete slightly reduced with the addition of UFA, and UFA concrete shows better crack resistance compared with ordinary concrete. The production technology of UFA pump pebble concrete is summarized based on test and engineering applications.

Influence of Artificial Aggregates on the ITZ's Microstructure of Recycling Concrete

2013 ◽  
Vol 743-744 ◽  
pp. 180-185
Author(s):  
Jun Hua Zhang ◽  
Zong Hui Zhou ◽  
De Cheng Zhang ◽  
Xin Cheng
Keyword(s):  
Fly Ash ◽  
Mineral Composition ◽  
High Performance ◽  
Raw Materials ◽  
Steel Slag ◽  
Interfacial Transition Zone ◽  
Hydration Products ◽  
Ordinary Concrete ◽  
Natural Aggregates ◽  
Furnace Slag

Artificial aggregates with high-performance were prepared by the methods including steel slag, furnace slag, fly ash and coal gangue, and the recycling concrete was prepared by artificial aggregates instead of natural aggregates. This kind of concrete abandoned was able to completely regenerate cement, which will make the reuse of concrete possible. The composition and characteristics of the artificial aggregates will produce a significant effect on the interfacial transition zone (ITZ) in recycling concrete. The morphological features and mineral composition of three artificial aggregates were analyzed by SEM and XRD, and the ITZ of three recycling concrete and one ordinary concrete was investigated by SEM and EDS. The results showed that compared with ordinary concrete, although the recycling concretes ITZ had a small amount of CH crystal, most of the space was filled with dense hydration products. The interface width was 40μm, which less than 50μm of ordinary concrete. Artificial aggregates with different ratio of raw materials had a great effect on recycling concretes ITZ. The ITZ of recycling concrete prepared with 30% steel slag, 50% furnace slag, 20% fly ash had the smallest Ca/Si and much more C-S-H. the structure of ITZ was much denser and the microstructure was relatively better.

A Research on the Anti-Sulfate Corrosion Effects of the Concrete Mixed with Complex Multi-Mineral Admixture

2011 ◽  
Vol 71-78 ◽  
pp. 755-759
Author(s):  
Ying Tang ◽  
Guo An Wang
Keyword(s):  
Fly Ash ◽  
Silica Fume ◽  
Significant Influence ◽  
Ash Content ◽  
Performance Characteristics ◽  
Mineral Admixture ◽  
Mineral Admixtures ◽  
Corrosion Effect ◽  
Slag Content

This paper is focused on the method for improving capability of anti-sulfate corrosion of concrete. Based on the performance characteristics of mineral admixture, propose a method that mixing concrete with complex multi-mineral admixture to improve the effect of anti-sulfate corrosion. Finally, the ability of anti-sulfate corrosion and anti-dry-wet cycle, in different case, is studied and compared. The results show that concrete mixed with complex multi-mineral admixture is advantageous to improve the anti-sulfate corrosion effects of the concrete. The proportion of mineral admixtures has significant influence on the anti-sulfate corrosion effect. As the silica fume and slag content increased, the fly ash content decreased, the ability of anti-sulfate corrosion enhanced.

Experimental Study on Impermeability and Frost Resistance of High Strength Concrete Used in Shaft of Coal Mine

2011 ◽  
Vol 287-290 ◽  
pp. 1019-1023
Author(s):  
Jing Feng Hou ◽  
Dong Ming Guo ◽  
Hui Dong Xu ◽  
Zeng Kun Yang
Keyword(s):  
Coal Mine ◽  
Frost Resistance ◽  
High Strength Concrete ◽  
High Strength ◽  
Mineral Admixture ◽  
Cement Stone ◽  
Mine Shaft ◽  
Strength Concrete ◽  
Overburden Soil ◽  
Thick Overburden

This paper presents results of impermeability and frost resistance tests of a series of high strength concrete which will be used in Yuncheng coal mine shaft lining. And the shaft is one of the most difficult to construct using freezing method because of the extreme thick overburden soil. The results show the impermeability and frost resistance of the selected concrete mix proportion options can meet the special requirements of the shaft construction. It’s due to the low water-cement ratio, admixture and water-reducing agent decreases void caused by excess water. And the composite mineral admixture forms bubbles to cut off the tiny water permeable channels in cement stone. Also the filling effect and pozzolanic effect caused by fly ash contribute a lot. The research on high strength concrete used in shaft of coal mine with thick overburden soil is still rare worldwide.

Early Age Cracking Characteristic of Concrete with Compound Admixtures

2013 ◽  
Vol 325-326 ◽  
pp. 71-74
Author(s):  
Yun Feng Li ◽  
Dong Sheng Zhang ◽  
Li Xu
Keyword(s):  
Blast Furnace ◽  
Fly Ash ◽  
Blast Furnace Slag ◽  
High Performance ◽  
High Performance Concrete ◽  
Steel Slag ◽  
Test Method ◽  
Mineral Admixture ◽  
Early Age ◽  
Furnace Slag

The shrinkage cracking of concrete plays an important role to the accelerated deterioration and shortening the service life of concrete structures. The mineral admixture will be a perfect component of high performance concrete and its utilization will be a valuable resource for recycling. Early age cracking characteristics of concrete with compound admixtures, such as steel slag, blast furnace slag, fly ash, are studied in this paper using plate test method. The better anti-cracking performance of concrete will be realized when blast furnace slag replacing cement at 30%, steel slag and fly ash as the equal mixture components replacing cement at 30%, three kinds of admixtures replacing cement at 30% under the proper proportion.

Experimental Research on the Durability of Inorganic Binder Stabilized Material with Soda Residue

2014 ◽  
Vol 629-630 ◽  
pp. 189-194 ◽  
Author(s):  
Yi Bo Yang ◽  
Mei Ru Zheng ◽  
Wen Ying Guo ◽  
Heng Chang Wang
Keyword(s):  
Silica Fume ◽  
Experimental Research ◽  
Frost Resistance ◽  
Chloride Ion ◽  
Mineral Admixture ◽  
Urgent Problem ◽  
Inorganic Binder ◽  
Cold Area ◽  
Negative Effect

The high contents of alkali ion and chloride ion in soda residue pollute environment. So how to treat the soda residue is an urgent problem to be solved in China. The soda residue can be used in inorganic binder stabilized materials. But the negative effect of soda residue is not studied. The impermeability, frost resistance, and chloride ion leaching of inorganic binder stabilize materials prepared by soda residue are studied. And the results as followings: (1) The permeability coefficients of cement/ mineral admixture-soda residue stabilized stone chip are very low, and they are good impermeable materials; (2) The frost resistance of cement-silica fume-soda residue stabilized stone chip is good, and silica fume is recommended to be used in cold area; (3) The mineral admixture has a better long-term immobilized effect on chloride ion than cement, and the ground granular blast-furnance slag is the best mineral admixture to immobilize the chloride ion.

Microscopic Mechanism of the Diffusivity of Concrete Chloride Ion

2013 ◽  
Vol 773 ◽  
pp. 687-692 ◽  
Author(s):  
Jun Liu ◽  
Feng Xing ◽  
Bi Qing Dong
Keyword(s):  
Fly Ash ◽  
Early Stage ◽  
Great Influence ◽  
Chloride Ion ◽  
Test Method ◽  
Mineral Admixture ◽  
Microscopic Mechanism ◽  
Cement Ratio ◽  
Water Cement Ratio ◽  
The Impact

Use concrete specimens with different mix proportions to conserve them for 90d taking into account the influence of mineral admixture material---fly ash. Then adopts the RCM test method to measure the rapid diffusivity of chloride ion of concrete and observes the microstructure of the cement paste using the SEM (scanning electron microscopy), aiming to study the impact of fly ash on its hydration process. The results show that the micro-pore structure of the concrete has a great influence on the rapid diffusivity of chloride ion, while its diffusivity is closely related with the water-cement ratio of concrete; after the fly ash is added, the ettringite generation of the concrete in the early stage decreases, and the interspace of the transition zone between the hydrated particles and hydration slurry is enlarged, coupled with the increase in the intercommunicating pore; after curing for 90d, the chloride ion diffusivity decreases significantly with the increase in the dosage of fly ash. For the concrete with the fly ash dosage of 15%, its chloride ion diffusivity is only 75.4% of that with the same water-cement ratio; when its fly ash content is 30%, its chloride ion diffusivity is only 32.3% of the ordinary concrete.

Study on the Hydration Micro-Structure and Properties of Complex Cementitious Systems

2010 ◽  
Vol 150-151 ◽  
pp. 783-787
Author(s):  
Qing Jun Ding ◽  
Xiu Lin Huang ◽  
Hua Sun
Keyword(s):  
Fly Ash ◽  
Pore Size Distribution ◽  
Mineral Admixture ◽  
Mineral Admixtures ◽  
Structure And Properties ◽  
Total Dosage ◽  
Micro Structure ◽  
Cement Pastes ◽  
Cementitious Systems ◽  
Better Than

In this study complex cementitious systems were prepared by cement, slag, fly ash and silica fume. Changing the dosages of mineral admixtures, then studying the strength and micro-structure of harden cement pastes by XRD,SEM,BET etc. Comparing the influence of variety and dosage of mineral admixture on cement pastes.Finally we found that mineral admixtures could improve the pore size distribution of cement pastes, and the total dosage 10% is better than 20%; and the "FA+SF" is better than others.

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