By John Newman, B S Choo
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Additional info for Advanced Concrete Technology 1: Constituent Materials (Advanced Concrete Technology Set)
A small sample of hydrated cement is placed in a thermobalance and the change in weight recorded as the sample is heated at a controlled rate from ambient to ~1000°C. The technique enables the proportion of certain hydrates present, such as ettringite and Ca(OH)2 to be determined quantitatively. X-ray diffraction This technique is rapid but provides limited information as many of the hydrates present, notably C–S–H gel and calcium aluminate monosulfate are poorly crystalline and give illdefined diffraction patterns.
While surface area is a good guide to the early rate of hydration of cement and thus early strengths, it is a less reliable guide to late strengths and, in particular, to 28-day strengths. This is because under standard curing conditions clinker particles which are coarser than approximately 30 microns are incompletely hydrated at 28 days. For a given SA the lower the 45-micron residue, the higher the 28-day strength. 4 MPa. In general, more modern milling installations, and in particular those with high efficiency separation, will yield cements with steeper size distributions.
As a general rule the more efficient the grinding process, the steeper the particle size grading. The range of particle sizes is smaller and this can result in increased water demand of the cement, at least in pastes and rich concrete mixes. This is because with a narrow size distribution there are insufficient fine particles to fill the voids between the larger particles and these voids must be filled by water. Concerns over product performance in the market and also mechanical/maintenance problems with some of the new milling technologies have resulted in the ball mill retaining its dominant position.
Advanced Concrete Technology 1: Constituent Materials (Advanced Concrete Technology Set) by John Newman, B S Choo