Concept of Shotcrete Technology

3113 Words Apr 6th, 2013 13 Pages
A
Technical Seminar Report
On
CONCEPTS OF SHOTCRETE TECHNOLOGY
In the partial fulfillment for the award of degree
Of
Bachelor of technology
In
Civil Engineering
By
SUKANTA MANNA (095Q1A0133)
SUBMITTED TO

DEPARTMENT OF CIVIL ENGNEERING
ANASUYA DEVI INSTITUTE OF TECHNOLOGY & SCIENCES
(Approved by AICTE and Affiliated to JNTU)
GUDUR (V), BIBINAGAR (M), NALGONDA (Dist).
ANASUYA DEVI INSTITUTE OF TECHNOLOGY & SCIENCES
GUDUR (V), BIBINAGAR (M), NALGONDA (Dist).
DEPARTMENT OF CIVIL ENGINEERING

CERTIFICATE This is to certify that this Project Work entitled “CONCEPTS OF SHOTCRETE TECHNOLOGY” is a bonafide work carried out by Mr. Sukanta Manna (095Q1A0133) in partial fulfillment of the requirements for the award of the
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Dry process 2. Wet process 1. DRY PROCESS
In this process, cement and moist aggregate are mixed and then placed into a device that meters the mixed material into a stream of compressed air. Material is carried by the compressed air through a delivery hose to the nozzle where water is added under pressure through a perforated ring. The water thoroughly wets the other ingredients as the mixture is jetted from the nozzle at high velocity onto the surface to be shotcrete.
Working of dry process proceeds as per the following steps:
Step1: Pre blended, dry or semi-dampened materials are placed into shotcrete equipment and metered into a hose.
Step2: Compressed air conveys materials at high velocity to the nozzle where the water is added.
Step3: Then the material is consolidated on receiving surface by high impact velocity.
The dry process can be used for any shotcreting applications from the smallest patching and sealing works to largest projects like tunnel linings, pools, canal linings or reservoirs. The maximum production achievable with dry process equipment ranges from 10-12 yards per hour of dry mix depending on the conditions. To achieve ultimate capacity it is necessary to use 2”-2.5” hose and larger compressors.
Most applications have production rates of 2-6 cubic yards per hour of mix. Patching and sealing are done at even low rates by employing 1”-1.5” hoses. In