–Mineral Admixture –Ordinary Portland Cement (P.O) –Portland granulated Blast-furnance-slag Cement (P.S) –Portland-Pozzlana Cement (P.P) –Portland fly-ash cement (P.F) –Composite Portland Cement (P.C) Chapter 3 Cement § 3.3 Portland Cement With Mineral Materials

It refers to the cement which is formed by Cement clinker, granulated blast- furnance slag and a little gypsum Quantities of granulated blast-furnance slag is 20% ～ 70% Hydraulic cementing material cementing material Clinker granulated blast- furnance slagGypsum Grinding P.S What is Portland granulated blast-furnance slag Cement

Technical Properties Its property is different from Portland cement and ordinary cement Reasons: In cement, Portland cement and ordinary cement is more and the clinker is little Technical performance: It can be divided into 6 types:32.5, 32.5R, 42.5, 42.5R, 52.5, 52. 5R Its early hardening is low Other technical requirements are the same with Portland cement

Tab Strength Demands of P.S,P.P,P.F Strength grade Compression strength (MPa) Fracture strength （ MPa ） 3d28d3d28d R R R

Characteristics of P.S Strength is low in the early days and high in the later days –The hydration of slag cement takes 2 steps: –hydration of cement clinker; secondary hydration reaction. –In the early days of a secondary hydration, the strength is low with low speed and little hydration. But it is contrary to the later days. –It is applicable to the prefabricated member cured in the middle days and projects with bearing slowly. –But it is not applicable to the projects with the requirement for higher early hardening. Comparing to Portland Cement and Ordinary Cement

Strong anti-corrosion and poor carbonation resistance – It is applicable to the water concrete and marine concrete –Not used in house with high concentration of CO 2 –Because of the low content of calcium hydroxide. Low hydration heat –It is applicable to the project with mass concrete Characteristics of P.S

Temperature sensitivity –It is applicable to the high temperature cuing because of temperature sensitivity. Low anti-freezing – The early hardening is low. – Water requirement of volcanic ash is big.  Heat resistance –It is applicable to the project with requirement of heat resistance concrete. Characteristics of P.S

 Poor permeability The large quality of mixing materials result in sharp arris of blast-furance slag and low water requirement and retentivity; therefore it can form bleeding channels easily. Note: the latter 2 items are the features of P.S. and other properties same with PP 、 PF cement. Characteristics of P.S