Abstract
This research have shown that the developed composition and method for preparation of granulated organic–mineral admixture S–3SSA allow production in drum granulator of cement materials modifier with de-sired properties using proposed mixing procedure for the admixture ingre-dients which include, mass. %: superplasticizer S–3 – 10; soap stock – 20; salt of inorganic acid – 30 and ash – 40. On the basis of laboratory studies, a ratio of the components included in the molding compound for pressed bricks with improved physical and technical properties was defined. Opti-mal composition of the molding compound should contain the following, mass.%: binder - 10; clay - 5; sand - 82; water - 3. A technological proce-dure for production of pressed brick based on gypsum binders of low water demand (GLWDB) was developed and technological production parame-ters were defined: moulding compound moisture content - 6%; raw materi-al strength – 0.4 MPa; specific pressure - about 15 MPa, curing conditions - natural. Basic physical and technical properties of pressed brick based on GVNV–50S were identified and studied. Strength kinetics, MPa: 1 day – 6.8; 3 days - 12.3; 28 days – 27; density-1950 kg / m3; softening coefficient equal.
Highlights
Nowadays and in the future, one of the effective methods for production process control and quality management is use of multifunctional modifiers of cement systems and binders such as low water demand binders (LWDB).In this regard, there is an objective need to develop a raw material mixture for production of pressed bricks, significantly different in their properties from the known analogues.Taking into account the data given in scientific and technical sources, it can be stated that development of new compositions and methods for production of environmentally friendly small-piece items with specified properties intended for wall construction is necessary
Use of chemical admixtures is a unique mean for control the technological process of new binders production, including binders of low water demand (LWDB)
LWDB is a hydraulic binder made of Portland cement clinker or Portland cement and its varieties, mineral admixtures, gypsum stone and dry modifier, including organic component based on naphthalene sulfates, by means of joint mechanical and chemical treatment in specially regulated conditions [2, 5]
Summary
Nowadays and in the future, one of the effective methods for production process control and quality management is use of multifunctional modifiers of cement systems and binders such as LWDB (low water demand binders).In this regard, there is an objective need to develop a raw material mixture for production of pressed bricks, significantly different in their properties from the known analogues.Taking into account the data given in scientific and technical sources, it can be stated that development of new compositions and methods for production of environmentally friendly small-piece items with specified properties intended for wall construction is necessary. Nowadays and in the future, one of the effective methods for production process control and quality management is use of multifunctional modifiers of cement systems and binders such as LWDB (low water demand binders). In this regard, there is an objective need to develop a raw material mixture for production of pressed bricks, significantly different in their properties from the known analogues. The purpose of this research was to develop compositions and method for pressed wall materials production on the base of fine-grained concrete with a hydrophobic binder of low water demand. It is necessary to use such technical solutions that would ensure exclusion of energy-intensive technological reworking (roasting, drying) and would allow use for bricks local raw materials (sand, ash, clay), low water demand binders and chemical additives (modifiers).
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