Using calcium chloride as an accelerator for Portland pozzolan cement concrete compressive strength development

Abstract

The influence of calcium chloride (CaCl2) as an accelerator for the compressive strength development of concrete made with type I Portland pozzolan cement (PPC) as a hydraulic binder has been investigated. Natural sand and crushed stone were used as fine aggregate and coarse aggregate, respectively. The mix proportion of concrete, by weight, was 1.0 binder: 2.1 fine aggregate: 3.4 coarse aggregate and the water-binder ratio was 0.57. The calcium chloride added to the concrete mixture was 0%, 1.0%, 1.5%, and 2.0% by binder weight. The compressive strength test was performed at 1, 3, 7, 28, and 90 days. The test results show that adding CaCl2 to a concrete mixture accelerates the development of compressive strength. The compressive strength gain was about 36–48% at 1 day and about 29–33% at 3 days, compared to control concrete. Moreover, it increases the compressive strength of PPC concrete about 3–16% at 28 days and about 7–19% at 90 days. The optimum dose of CaCl2 to accelerate the development of compressive strength at the early age and to produce the highest compressive strength in the long-term was about 1.5%.

Reducing the Waiting-On-Cement Time of Geopolymer Well Cement using Calcium Chloride (CaCl2) as the Accelerator: Analysis of the Compressive Strength and Acoustic Impedance for Well Logging

“…In another study [13], it was observed that the addition of 4% of CaCl 2 to three different types of OPC increased the compressive strength of concrete, which was cured at 7, 14, 21, and 28 days. Similarly, another study [14] revealed that as the concentration of CaCl 2 increased from 1% to 2%, the compressive strength of the OPC concrete also increased for curing durations of 1, 3, and 7 days. However, at Days 28 and 90, the cement samples gained the highest compressive strength at a CaCl 2 concentration of 1.5%, and the compressive strength decreased as the concentration of CaCl 2 increased to 2%.…”

“…Furthermore, previous studies predominantly focused on concrete, where the composition of concrete is different to well cement [17,18]. Even though several studies have been conducted to study the influence of CaCl 2 on GPC, HPHT conditions were not adopted in their experimental work [14].…”

A Review Study of the Use of Calcium Chloride in Concrete

“…When calcium chloride is used as an accelerator admixture in the concrete, it increases the rate of hardening of the concrete [13,14]. ASTM C-494 requires a minimum increase of 125% over the control sample at age of 3 days.…”

“…According to Butler, the calcium chlorides of low levels can hardly be responsible for major reinforced concrete distress. Some other researchers have concluded that CaCl2 does not significantly corrode rebar if the concrete is welldesigned and well-compacted and if the reinforcement concrete cover is suitable [14].…”

Kekuatan dan Permeabilitas Beton Abu Terbang Volume Tinggi

“…Selain itu kondisi ini juga dipengaruhi oleh relatif lebih lambatnya reaksi yang terjadi antara unsur reaktif dari ATC dengan kapur bebas yang dihasilkan SPI. Gejala lambatnya perkembangan kekuatan pada beton yang mempergunakan perekat hidrolik berupa campuran antara SPI dan abu terbang kelas F maupun berupa semen Portland pozzolan juga telah dilaporkan masing -masing oleh Salain (2017) dan Salain (2019). Seperti dinyatakan oleh Malhotra dan Ramezanianpour (1994) bahwa faktor-faktor penting yang mempengaruhi perkembangan kekuatan dan permeabilitas beton yang mempergunakan abu terbang yaitu properti dari abu terbang, komposisi kimia, ukuran partikel, reaktivitas, serta kondisi temperatur dan perawatan.…”