DISCUSSION. IN SITU MEASUREMENT OF THE EFFECT PARTIAL PORTLAND CEMENT REPLACEMENT USING EITHER FLY ASH OR GROUND GRANULATED BLAST-FURNACE SLAG ON THE PERFORMANCE OF MASS CONCRETE

1981 ◽  
Vol 71 (2) ◽  
pp. 601-613
Author(s):  
PB BAMFORTH ◽  
FG BUTLER ◽  
LT ONG ◽  
JF HOUNSLOW ◽  
PL OWENS ◽  
...  
Keyword(s):  
Blast Furnace ◽  
Fly Ash ◽  
Portland Cement ◽  
Blast Furnace Slag ◽  
In Situ Measurement ◽  
Mass Concrete ◽  
Cement Replacement ◽  
Granulated Blast Furnace Slag ◽  
Furnace Slag

scholarly journals Protective Geopolymer Coatings Containing Multi-Componential Precursors: Preparation and Basic Properties Characterization

Materials ◽  
2020 ◽  
Vol 13 (16) ◽  
pp. 3448
Author(s):  
Chenhui Jiang ◽  
Aiying Wang ◽  
Xufan Bao ◽  
Zefeng Chen ◽  
Tongyuan Ni ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Blast Furnace ◽  
Fly Ash ◽  
Portland Cement ◽  
Adhesive Strength ◽  
Blast Furnace Slag ◽  
Setting Time ◽  
Rapid Test ◽  
Granulated Blast Furnace Slag ◽  
Furnace Slag

This paper presents an experimental investigation on geopolymer coatings (GPC) in terms of surface protection of civil structures. The GPC mixtures were prepared with a quadruple precursor simultaneously containing fly ash (FA), ground granulated blast-furnace slag (GBFS), metakaolin (MK), and Portland cement (OPC). Setting time, compressive along with adhesive strength and permeability, were tested and interpreted from a perspective of potential applications. The preferred GPC with favorable setting time (not shorter than 120 min) and desirable compressive strength (not lower than 35 MPa) was selected from 85 mixture formulations. The results indicate that balancing strength and setting behavior is viable with the aid of the multi-componential precursor and the mixture design based on total molar ratios of key oxides or chemical elements. Adhesive strength of the optimized GPC mixtures was ranged from 1.5 to 3.4 MPa. The induced charge passed based on a rapid test of coated concrete specimens with the preferred GPC was 30% lower than that of the uncoated ones. Setting time of GPC was positively correlated with η[Si/(Na+Al)]. An abrupt increase of setting time occurred when the molar ratio was greater than 1.1. Compressive strength of GPC was positively affected by mass contents of ground granulated blast furnace slag, metakaolin and ordinary Portland cement, and was negatively affected by mass content of fly ash, respectively. Sustained seawater immersion impaired the strength of GPC to a negligible extent. Overall, GPC potentially serves a double purpose of satisfying the usage requirements and achieving a cleaner future.

Effect of Particle Packing and Fly Ash on Performance of Ordinary Portland Cement/Anhydrite-Activated Ground-Granulated Blast-Furnace Slag

2017 ◽  
Vol 114 (4) ◽  
Author(s):  
Tristana Y. Duvallet ◽  
Laurent Frouin ◽  
Thomas L. Robl ◽  
Anne E. Oberlink ◽  
Robert B. Jewell
Keyword(s):  
Blast Furnace ◽  
Fly Ash ◽  
Portland Cement ◽  
Blast Furnace Slag ◽  
Ordinary Portland Cement ◽  
Particle Packing ◽  
Granulated Blast Furnace Slag ◽  
Furnace Slag

scholarly journals Preparation of Foamed Phosphogypsum Lightweight Materials by Incorporating Cementitious Additives

2019 ◽  
Vol 25 (3) ◽  
pp. 340-347
Author(s):  
Ting WANG ◽  
Xiaojian GAO ◽  
Jian WANG
Keyword(s):  
Compressive Strength ◽  
Blast Furnace ◽  
Fly Ash ◽  
Portland Cement ◽  
Blast Furnace Slag ◽  
Building Materials ◽  
Water Resistance ◽  
Hydrated Lime ◽  
Granulated Blast Furnace Slag ◽  
Furnace Slag

As a byproduct of phosphoric acid industry, phosphogypsum has many environmental problems. In order to recycle phosphogypsum to manufacture lightweight building materials, cementitious additives including fly ash, ground granulate blast-furnace slag and Portland cement were added to improve strength and water-resistance and different volume of foam was added to reduce the bulk density. The results show that hydrated lime can improve mechanical strength and water resistance of PG paste and the optimal dosage of hydrated lime is 6 %. Higher addition of fly ash or ground granulated blast-furnace slag improves the fluidity and delays the setting time of PG paste. The addition of 10 ~ 20 % fly ash results in a little reducing influence and 10 % ground granulated blast-furnace slag leads to an increase of 20.7 % for 28 days compressive strength of hardened PG specimen. The higher addition of Portland cement results in the better mechanical strength and water resistance of PG specimens. The 28day compressive and flexural strength reaches 25.9 MPa and 8.9 MPa respectively for the 25 % Portland cement mixture. PG based lightweight building materials can prepared by the addition of 60 % volume of air foam, with compressive strength of 1.7 MPa, bulk density of 521.7 kg/m3 and thermal conductivity of 0.0724 W/(m·K). DOI: http://dx.doi.org/10.5755/j01.ms.25.3.19910

A Novel Technique for Crack Resistance of Bulk Mass Concrete Pier

2011 ◽  
Vol 383-390 ◽  
pp. 1719-1724
Author(s):  
H.B. Zhu ◽  
P.M. Wang ◽  
G. T. Yan ◽  
C.S. Wang ◽  
Y.S. Cheng ◽  
...  
Keyword(s):  
Blast Furnace ◽  
Fly Ash ◽  
Blast Furnace Slag ◽  
Hydration Heat ◽  
Shrinkage Stress ◽  
Mass Concrete ◽  
Granulated Blast Furnace Slag ◽  
Bulk Mass ◽  
Higher Temperature ◽  
Furnace Slag

The bulk mass concrete pier is esay to crack because of higher temperature contrast between inner and outer of concrete. Experimentation use admixtures to replace some of cement so as to low the hydration heat. Fly ash can decrease more hydration heat than granulated blast furnace slag. If 40 percent of cement in weight is replaced by same amount of blend admixture of fly ash and granulated blast furnace slag, not only the compression strength can meet the requirement of engineering design, but also the hydration heat reduce a lot. Meanwhile, this paper develops a novel lining fabric especially for concrete steel formwork to advance water-retaining property and warm-keeping efficiency, and to distract shrinkage stress by ways of veins of fabric. Because of developed lining fabric and optimized mixture in this paper, the cracking problem of bulk mass concrete pier is avoided.

scholarly journals Granulated Blast-Furnace Slag and Coal Fly Ash Ternary Portland Cements Optimization

2020 ◽  
Vol 12 (14) ◽  
pp. 5783 ◽  
Author(s):  
Rosa Abnelia Rivera ◽  
Miguel Ángel Sanjuán ◽  
Domingo Alfonso Martín
Keyword(s):  
Compressive Strength ◽  
Blast Furnace ◽  
Fly Ash ◽  
Portland Cement ◽  
Blast Furnace Slag ◽  
Coal Fly Ash ◽  
Cement Clinker ◽  
Portland Cements ◽  
Granulated Blast Furnace Slag ◽  
Furnace Slag

Granulated blast-furnace slag (GBFS) and coal fly ash (CFA) are two well-known constituents in Portland cements. Ternary Portland cements (GBFS-CFA-K) provide environmental advantages by reducing Portland cement clinker (K) production and, therefore, promote lower CO2 emissions. Nevertheless, both of them cause a delay in the compressive strength gain. Given that, the early compressive strength for both constituents is low, but they improve the compressive strength at medium and later ages as consequence of the pozzolanic reaction. In this paper, a full factorial design with two levels was developed for the mortar compressive strength estimation at 2, 7 and 28 days. Mortar prisms made with 25% and 40% of granulated blast-furnace slag (GBFS) and/or coal fly ash (CFA) were tested. The effects of the interaction between GBFS and CFA on the compressive strength development of ternary Portland cement mortars were reported. Results show that the contribution of both cement constituents to the ternary mortar mix reduces the compressive strength for all the tested ages. Nevertheless, the finer the GBFS, the better ternary cement performance was achieved, showing that the synergistic effect is more effective when the finer GBFS is used, probably due to a more adequate particle size distribution. Finally, a relationship between compressive strength, fineness, GBFS content and CFA content was found for each age.

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