cold-mix asphalt concrete this is produced by emulsifying the asphalt in water with an emulsifying agent prior to mixing with the aggregate. while in its emulsified state, the asphalt is less viscous and the mixture is easy to work and compact.
shotcrete is an all-inclusive term for spraying concrete or mortar with either a dry or wet mix process. however, shotcrete may also sometimes be used incorrectly to distinguish wet-mix from the dry-mix method. the term shotcrete was first defined by the american railway engineers association area in the early 1930s. by 1951, shotcrete had .
first is the barrel truck or in–transit mixers. this type of truck delivers concrete in a plastic state to the site. second is the volumetric concrete mixer. this delivers the ready mix in a dry state and then mixes the concrete on site. batch plants combine a precise amount of gravel, sand,.
composting is an aerobic method meaning that it requires the presence of air of decomposing organic solid wastes. it can therefore be used to recycle organic material. the process involves decomposition of organic material into a humus-like material, known as compost, which is a good fertilizer for plants. composting requires the following three components: human management, aerobic .
this method of mix proportioning is especially popular when producing high-strength concrete and fiber-reinforced concrete. adding 1-2% plasticizer per unit weight of cement is usually sufficient. adding an excessive amount of plasticizer will result in excessive segregation of concrete and is not advisable. depending on the particular chemical .
regular concrete is the lay term for concrete that is produced by following the mixing instructions that are commonly published on packets of cement, typically using sand or other common material as the aggregate, and often mixed in improvised containers. the ingredients in any particular mix depends on the nature of the application.
different methods in situ. in situ is a latin phrase meaning “in the place”. when referred to chemistry or chemical reactions it means “in the reaction mixture”. in situ s/s, accounting for 20% of s/s projects from 1982-2005, is used to mix binding agents into the contaminated material while remaining on the site.
a cover meter is an instrument to locate rebars and measure the exact concrete cover.rebar detectors are less sophisticated devices that can only locate metallic objects below the surface. due to the cost-effective design, the pulse-induction method is one of the most commonly used solutions.
cast-in-place concrete is a technology of construction of buildings where walls and slabs of the buildings are cast at the site in the formwork. this differs from precast concrete technology where slabs are cast elsewhere and then brought to the construction site and assembled. it uses concrete slabs for walls instead of bricks or wooden panels, and formwork is used for both walls and roof.
a mix is then designed using cement portland or other cementitious material , coarse and fine aggregates, water and chemical admixtures. the method of mixing will also be specified, as well as conditions that it may be used in. this allows a user of the concrete to be confident that the structure will perform properly.
foam concrete is one among the types of concrete produced by initially making a slurry of cement fly ash or sand water, which is further mixed with the addition of pre-formed stable foam in an unique concrete mixing plant under ambient conditions
the alkali–silica reaction, more commonly known as 'concrete cancer', is a swelling reaction that occurs over time in concrete between the highly alkaline cement paste and the reactive non-crystalline silica found in many common aggregates, given sufficient moisture. this reaction causes the expansion of the altered aggregate by the formation of a soluble and viscous gel of sodium silicate. this hygroscopic gel swells and increases in volume when absorbing water: it exerts an expansive .