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'''Concrete''' is a material commonly used in construction. It is composed of cement, aggregate, water and special chemicals known as admixtures.
'''Concrete''' is a material commonly used in construction. It is composed of cement, aggregate, water and special chemicals known as admixtures.
==Cement==
Usually, Portland cement is used to make concrete. Portland cement contains calcium silicates.
==Admixtures==
==Admixtures==