摘要:
PROBLEM TO BE SOLVED: To provide a practical composition for a heat insulating material that uses crystalline calcium silicate (including hydrate) such as xonotlite, tobermorite, gyrolite, and wollastonite as a raw material, which has better thermal insulation properties than the conventional products and is obtained by a convenient production method with no problems related to the drainage of calcium salt.SOLUTION: A composition for a heat insulating material is obtained by reacting (1) at least one type of crystalline calcium silicate selected from a group consisting of xonotlite, tobermorite, gyrolite, and wollastonite, and (2) at least one type of inorganic substance selected from a group consisting of calcium hydroxide, calcium carbonate, cement, amorphous calcium silicate hydrate, talc, and magnesium hydroxide, with phosphoric acid in the presence of water.
摘要:
Wallboards, as well as other building materials, are produced by methods which use significantly reduced embodied energy, generating far less greenhouse gases when compared with the energy used to fabricate gypsum wallboard. A novel cementitious core, consisting in one embodiment of post-industrial waste such as slag and combined with pH modifiers, provides a controlled exothermic reaction to create a gypsum-wallboard-like core which can be wrapped in a selected material such as recycled paper and manufactured on a conveyor system to appear, weigh and handle similar to gypsum wallboard, but without the large amounts of energy required to make gypsum wallboard. The manufacturing process results in lower greenhouse gas emissions than the processes used to make gypsum wallboard.
摘要:
The invention provides an ultra high performance concrete (UHPC) which comprises in parts by weight: 100 of Portland cement; 50 to 200 of a sand having a single grading with a D10 to D90 between 0.063 and 5mm, or a mixture of sands (preferably two sands), the finest sand having a D10 to D90 between 0.063 and 1mm and the coarsest sand having a D10 to D90 between 1 and 4mm 10 to 50 of a particulate substantially non-pozzolanic material having a mean particle size less than 15 ¼m; 0.1 to 10 of a water-reducing superplasticizer; and 10 to 30 of water; which concrete is substantially free of silica fume; the said concrete having a compressive strength greater than 100 Mpa at 28 days.