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·limestone up to 25% with Portland cement should not impair the pore structure limit on limestone content for its effect on strength is likely to be about 15% This should be considered where higher proportion of limestone content is allowed in the Standards Limestone addition Portland cement blended cements pore structure concrete
· Surface Area The surface area pore diameter size and total pore volume of the limestone media was determined using Quantachrome Instruments The result from BET analysis shows that the surface area of raw limestone was m 2 /g However this media exhibited much lower specific surface area than the common adsorbents such as activated
·Similar results were found by Vuk et al [2001] where they noted that the rate of hydration of C 3 S was increased in the presence of finely ground limestone over coarser limestone however the
·limestone addition on the combustion and emission characteristics of coal slime The experimental results showed that High Temperature & Post combustion Technology combined with the sorbent injection in the furnace is a very promising technology to control the NOx and SO2 emissions simultaneously Limestone addition can cause
·associated effectiveness of limestone addition in terms of the ratio of mass of CO 2 absorbed to mass of limestone added and 3 to assess the potential impact of limestone addition on the atmospheric CO 2 concentration and on the pH and degree of supersaturation of surface waters both in the regions where limestone is added and globally
·Semantic Scholar extracted view of "Limestone addition effects on concrete porosity" by A A Elgalhud et al Results show that the use of limestone fines at higher level reduces concrete strength at long term for all types of cement and concrete mixtures with limestone fines exhibit lower resistance to chloride ion penetration and
the binder Generally the addition of finely ground limestone particles will result in a greater packing den sity of the binder leading to reduced water demand bet ter workability and mix cohesiveness and therefore a denser structure of hardened cement paste In a recent study the use of limestone as a filler in self compacting
·The results showed that the reduction of NO with limestone addition was caused by the catalysis of CaSO 4 on the reduction reaction of NO by CO into N 2 in the dilute phase of the CFBB Then the catalysis of CaSO 4 on the reduction reaction of NO and CO was further experimentally studied in a horizontal tube furnace
·The highest diffusion coefficient in the long term for the L mortars would also agree with the previous results and it would be due to the non active effect of limestone addition The water absorption after immersion was similar for the different mortars studied see Figure 6
Addition of fine limestone provides an excellent means to reduce the amount of clinker in cement It is now well accepted that limestone partially reacts in cementitious systems with C3A to produce hemi and monocarboaluminate phases and as a consequence more sulfate is available to form ettringite and the total volume of hydrates increases The mechanism by which limestone
·The results from Bentz et al 2012 showed that addition of limestone could yield fruitful benefits for addressing setting issues as seen in the case of high volume fly ash concrete see Fig 11 [101] Addition of limestone with 4 μm mean particle size was able to reduce the setting by 2 h and 4 h with 5% and 10% limestone replacing fly ash
·This paper investigates the effect of equivalence ratio ER in the range of temperature between 700 and 800 °C as well as the addition of limestone blended with the poultry litter on
·The results show that the addition of fine limestone increases the number of 50 100 nm pores while the coarse limestone leads to more pores in the size range of 100 1000 nm As the limestone content increases less chloride is bound by physical adsorption while more Friedel s salt is formed
·The effects of limestone addition on NOx and N 2 O emissions during PS combustion were investigated further in a small scale CFB reactor Other from the results of BFB experiments the emission of NO was reduced by limestone addition and the reduction rate of NO was continuously increased by increasing the Ca/S molar ratio
·Systematic analysis and evaluation of experimental results on carbonation and carbonation induced corrosion resistance of concrete made with Portland limestone cement PLC are presented; these results have been extracted from 143 globally published studies in the literature since 1986 by 274 researchers from 131 institutions and 34 countries and yielding a
·addition and gradually increased to 12 6 mg/1 CaC03 eq in the same time period The second addition of 180 tons of the same limestone yielded similar initial results The pH increased to the alkalinity increased to mg/1 CaC03 eq and the acidity was eliminated In general this low cost <$2 000
·These results indicate that it is possible to partially replace slag by limestone in sulfate activated slag cements without changing the type of reaction products forming in these systems while
·The results show that the addition of alumina enriched pozzolans benefits the formation of hemicarboaluminate that has low density and high filling efficiency which helps to densify the matrix
·The obtained results suggest that the use of high fineness cement accelerates the hydration reaction much faster than the addition of limestone powder with a large surface area The presence of limestone promotes cement hydration through seeding which forms additional nucleation sites for hydration products on the filler surface and increases
·Test results showed that there is no significant effect on most properties due to increasing the limestone addition in cement from % to a maximum of 12% nternational perspective of Portland
·The experimental results showed that High Temperature & Post combustion Technology combined with the sorbent injection in the furnace is a very promising technology to control the NOx and SO2 emissions simultaneously Limestone addition can cause the slight decrease in combustion temperature Limestone addition will lead to the increase in NOx
·The results show that the emissions of PM 1 are effectively reduced by kaolin or limestone addition during oxy fuel combustion because kaolin captures alkali metal compounds while limestone reacts with sulfur effectively The optimum temperature for PM 1 reduction by kaolin or limestone addition is 1373 K among
·The early results based on the Bulk Diffusion Test ASTM C 1556/NT Build 443 and the Rapid Migration Test AASHTO TP 64/NT Build 492 tests indicate that with a 10% mineral addition based on
·Results showed that the ASR was significantly mitigated by both the limestone addition and the accelerated carbonation The expansion was decreased by the increased limestone addition and the carbonation depth Such mitigation of ASR was attributed to the reduced alkalis in the specimens with either limestone addition or carbonation
·The results indicated that the amount of reacted carbonate in cement hydration at a 15% addition of slightly or medium soluble carbonates does not exceed 5% and is not affected by their solubility
The effects of curing temperature 20°C 40°C and 60°C and the addition of limestone powder LP 6% and 12% on the capillary water absorption CWA of high volume fly ash HVFA cement mortar were investigated Prediction of the water penetration depth in the HVFA cement mortar was consistent with the CWA results The results of this
·This study aims at evaluating synergistic influences of limestone powder LP and unground rice husk ash URHA utilizations on comprehensive performances of a slag cement self compacting concrete SCC In addition the improved strength efficiency of the binders in concretes due to the additives of LP and/or URHA was also explored Experimental
