This paper reports results on the porosity and pore size distribution (PSD) of cement paste containing simulated desulphurised waste (SDW). The SDW was chosen due to the variability in chemical composition of real desulphurised waste. The SDW is a combination of fly ash and gypsum. The content of fly ash in the SDW changed from 0 to 100% by weight. The water to binder ratio was 0·5. The binder consists of cement and SDW. Cement in the pastes was partially replaced with 25 wt-% SDW. The porosity and PSD of cement pastes at 28 days of curing is reported. Increasing amount of gypsum does not seem to greatly change the pore volume; however, there is tendency of obtaining coarser pore structure in the presence of gypsum. The compressive strength increases with increasing amounts of gypsum. Correlation between strength and PSD is conducted.
OdlerI, RoblerM: ‘Investigation on the relationship between porosity, structure and strength of hydrated Portland cement paste (II): effect of pore structure and of degree of hydration’, Cem.Concr. Res., 1985, 15, 401–410.
2.
FukayaY, HoshiharaH, MizukamiY: ‘Effect of particle size distribution on the structure and strength of cement paste’, CAJ Proc. Cem. Concr., 1991, 45, 92–97.
3.
MangatPS, KhatibJM: ‘Influence of initial curing on pore structure and porosity of blended cement concretes’, Proc. 4th Int. Conf. on ‘Flay ash, slag and natural pozzolanas in concrete’, Istanbul, Turkey, May 1992, American Concrete Institute, Vol. 1, 813–833.
4.
CallejaJ: ‘Future trends in the research of the structure, properties and behaviour of blended cements’, Proc. 8th Int. Cong. on ‘Chemistry of cement’, Rio de Janeiro, Brazil, September 1986, Vol. 1, 233–248.
5.
KoliasS: ‘Investigation of the possibility of estimating concrete strength by porosity measurements’, Mater. Struct., 1994, 27, 265–272.
6.
JiangL, GuanY: ‘Pore structure and its effect on strength of high volume fly ash paste’, Cem. Concr. Res., 1999, 29, 631–633.
7.
MangatPS, KhatibJM, WrightL: ‘Optimum utilisation of flue gas desulphurisation (FGD) waste in blended binder for concrete’, Constr. Mater. J.: Proc. Inst. Civil Eng., 2006, 1, (2), 60–68.
8.
KhatibJM, MangatPS, WrightL: ‘Using flue gas desulphurisation (FGD) waste in mortar’, Proc. Int. Conf. on ‘Concrete platform 2007’, Northern Ireland, UK, April 2007, Queen's University Belfast, 395–404.
SinghM, GargM: ‘Relationship between mechanical properties and porosity of water-resistant gypsum binder’, Cem. Concr. Res., 1996, 26, (3), 449–456.
11.
WeeTH, MatsunagaY, WatanabeY, SakaiE: ‘Microstructure and strength properties of high strength concretes containing various mineral admixtures’, Cem. Concr. Res., 1995, 25, (4), 715–720.
WildS, HadiM, KhatibJ: ‘The influence of gypsum content on the porosity and pore-size distribution of cured PFA-lime mixes’, Adv. Cem. Res., 1995, 7, (26), 47–55.
14.
KhatibJM, MangatPS: ‘Porosity of cement paste cured at 45°C as a function of location relative to casting position’, J. Cem. Concr. Compos., 2003, 24, 97–108.
15.
KhatibJM, WildS: ‘Pore size distribution of Metakaolin paste’, Cem. Concr. Res. J., 1996, 26, (10), 1545–1553.
16.
ManmohanD, MehtaPK: ‘Influence of pozzolanic, slag, and admixtures on pore size distribution and permeability of hardened cement pastes’, Cem. Concr. Aggreg., 1981, 3, 63–67.
17.
UchikawaH: ‘Effect of blending components on the hydration and structure formation’, Proc. 8th Int. Cong. on ‘Chemistry of cement’, Rio de Janeiro, Brazil, September 1986, ACI, Vol. 1, 249–280.
18.
RamezanianpourAA, MalhotraVM: ‘Effect of curing on the compressive strength, resistance to chloride-ion penetration and porosity of concretes incorporating slag, fly ash or silica fume’, Cem. Sand Concr. Compos., 1995, 17, 125–133.
19.
SinghM, GargM: ‘Relationship between mechanical properties and porosity of water-resistant gypsum binder’, Cem. Concr. Res., 1996, 26, (3), 449–456.
20.
WildS, HadiM, WardGL: ‘The influence of gypsum content on microstructural development, strength and expansion of cured PFA-Lime mixes’, Adv. Cem. Res., 1990, 3, (12), 153–166.
