5837-23 - Cement Grout Undersealing and Slab Jacking Cement...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
Cement Grout Undersealing and Slab Jacking Cement Grout Undersealing – Insertion by pressure of a cement grout mixture beneath a slab to fill voids and prevent pumping. Slab Jacking – Lifting of the slab in areas of settlement Purpose: To stabilize the existing slabs so that they would not continue to deteriorate rapidly in the future. Signs of pumping in concrete pavement
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Slab breakup from voids beneath leave slab (due to pumping) Requirement of Grout for Undersealing: (1) The grout should be fluid enough to flow into very small voids. (2) It must develop adequate strength and have good durability. Properties. Commonly-Used Grout Mixtures: (1) Cement-limestone dust grout (2) Cement-fly ash grout Typical composition: 1 part of cement & 3 parts of limestone or fly ash by volume, mixed with water to achieved required fluidity. Water reducing or plasticizer admixtures may be added.
Background image of page 2
Other grout mixtures which have been used: (1) Cement-top soil slurry – provides only temporary improvements (2) Cement-fine sand slurry – does not provide good flowability. Cement-flyash grout is generally preferred over cement-
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 21

5837-23 - Cement Grout Undersealing and Slab Jacking Cement...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online