Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.   Yes  X     No      

APPLICABLE ONLY TO CORPORATE ISSUERS:

      Indicate the number of shares outstanding of each of the issuer's classes of common stock, as of the latest practicable date:

See accompanying Notes to Financial Statements

See accompanying Notes to Financial Statements

See accompanying Notes to Financial Statements

1.   Basis of Presentation

2.   Effective Tax Rate

3.   New Accounting Standards

4.   Segment Data

	Three Months Ended          June 30		Six Months Ended          June 30
	2000	1999	2000	1999
NET SALES   Construction Materials   Chemicals      Total	$ 514.1   151.1 $ 665.2	$ 479.8   131.7 $ 611.5	$ 880.3     299.8 $ 1,180.1	$ 826.5     267.3 $ 1,093.8
EARNINGS BEFORE INTEREST AND INCOME TAXES   Construction Materials   Chemicals      Total	$ 119.7     1.9  $ 121.6	$ 107.1     (.2) $ 106.9	$ 157.4    8.9 $ 166.3	$ 146.7    10.6 $ 157.3

	June 30, 2000	June 30, 1999
IDENTIFIABLE ASSETS   Construction Materials   Chemicals      Identifiable Assets   Investment in nonconsolidated affiliates   General corporate assets   Cash items        Total	$ 2,224.0      618.1 2,842.1 61.9 68.4        31.5 $ 3,003.9	$ 2,080.3      483.2 2,563.5 73.9 67.4        77.5 $ 2,782.3

5.   Supplemental Cash Flow Information

	2000	1999
SUPPLEMENTAL DISCLOSURE OF CASH FLOW  INFORMATION   Cash paid during the period for:       Interest, net of amount capitalized       Income taxes	$ 19,459 17,582	$ 17,435 10,197
SUPPLEMENTAL SCHEDULE OF NONCASH INVESTING  AND FINANCING ACTIVITIES:   Liabilities and long-term debt assumed in business      acquisitions   Fair value of stock issued in business acquisitions   Debt issued in purchase of assets, net of assumed liabilities	$  -0-  -0-  -0-	$ 386,292 10,580 645

GENERAL COMMENTS

Results of any individual quarter are not necessarily indicative of results to be expected for the year due principally to the effect that weather can have on the sales and production volume of the Construction Materials segment. Normally, the highest sales and earnings of the Construction Materials segment are attained in the third quarter and the lowest are realized in the first quarter when sales and earnings are substantially below the levels realized in all subsequent quarters of the year.

Segment earnings are earnings before interest and income taxes and after allocation of corporate expenses and income, and after assignment of equity income to the segments with which it is related in terms of products and services. Allocations are based on average capital employed and customer sales.

Certain matters discussed in this report contain forward-looking statements that are subject to risks and uncertainties that could cause actual results to differ materially from those projected. These include general business conditions, competitive factors, pricing, energy costs and other risks and uncertainties detailed in the Company's periodic reports.

Second Quarter 2000 as Compared with Second Quarter 1999

The Company's sales, pretax earnings and net earnings were at record levels for the second quarter. Sales of $665.2 million and pretax earnings of $111.7 million increased 9% and 19%, respectively, from the $611.5 million and $94.1 million realized in the second quarter of 1999. Net earnings of $76.1 million and $0.75 per share (diluted) were 21% and 23% higher than the $62.7 million and $.61 per share achieved in the second quarter of 1999.

Construction Materials reported record second quarter sales of $514.1 million, up 7% from the 1999 second quarter of $479.8 million. For aggregates, our principal product, pricing improved almost 4% while volumes increased nearly 2%, the majority of which was from recent acquisitions. Chemicals' second quarter sales of $151.1 million were up nearly 15% from the prior year's $131.7 million.

Earnings before interest and income taxes were $121.6 million as compared to $106.9 million in the same period last year. The Construction Materials segment reported record second quarter earnings of $119.7 million, up 12% from second quarter 1999's $107.1 million. Aggregates operating costs were improved through efficiencies, nearly offsetting a $0.04 per share negative impact of higher costs for oil-based products. The Chemicals segment reported second quarter earnings of $1.9 million, up $2.1 million from the second quarter 1999 loss. Chemicals continued to experience difficult market conditions and increased costs associated with energy, raw materials and start-up of the new joint venture facility. Improved pricing for chlorinated products offset the impact of the higher costs. However, the strong demand for chlorine impacted the global supply/demand balance for the chloralkali co-product, caustic soda. This imbalance put pricing pressure on caustic, preventing a significant improvement in earnings for the quarter.

Selling, administrative and general expenses of $57.1 million were up 9% from second quarter 1999, due mainly to higher provisions for charitable contributions and increased costs within the Chemicals segment.

Other operating costs of $6.4 million increased $1.5 million from the prior year. This increase reflects increased amortization of goodwill.

Minority interest income of $2.1 million reflected the minority partner's share of the Chloralkali joint venture's pretax loss.

Other income, net of other charges, was $9.0 million as compared with $5.6 million for the second quarter of 1999. This increase was principally due to greater gains from asset sales referable to the Construction Materials segment.

Interest expense of $11.1 million for the second quarter of 2000 decreased $2.6 million from the second quarter of 1999 due to a significant reduction in debt, $111 million, and capitalized interest credit associated with the Chloralkali joint venture.
The effective tax rate for the quarter was 31.9%, down slightly from last year's second quarter rate of 33.4%. The decrease resulted from the settlement of prior year tax audits and adjustments.


Year-to-Date Comparisons as of June 30, 2000 and June 30, 1999

Year-to-date, the Company's sales were a record while net earnings and earnings per share were both up 11% from the first half of 1999. Net earnings were $99.3 million, or $.97 per share (diluted), as compared with 1999 earnings and earnings per share of $89.1 million and $.87 per share.

Sales of $1.2 billion for the first six months of 2000 increased 8% from the first half 1999 total of $1.1 billion. Construction Materials sales of $880.3 million were up nearly 7% from 1999's $826.5 million. Aggregates pricing increased almost 4% while volumes increased nearly 3%, with new facilities accounting for slightly more than one-half of the volume increase. Chemicals' first half sales of $299.8 million were up 12% from 1999's $267.3 million.

Earnings before interest and income taxes were $166.3 million as compared to $157.3 million in the same period last year. At $157.4, earnings in the Construction Materials segment increased 7% from the prior year's $146.7 million. However, excluding the impact of a positive legal settlement in the prior year, earnings were up almost 11% as lower operating costs neutralized the impact of higher costs for oil products. Year-to-date the Chemicals segment reported earnings of $8.9 million, down $1.7 million from last year's earnings of $10.6 million. This decline from the 1999 level resulted from the global supply/demand imbalance for caustic soda, higher costs associated with energy, raw materials and start-up of the new joint venture facility.

Selling, administrative and general expenses reflected a 5% increase when compared to the first half of 1999. This increase resulted primarily from higher provisions for charitable contributions and increased costs within the Chemicals segment.

Other operating costs of $12.4 million increased $3.5 million from the prior year. This increase reflects increased amortization of goodwill.

Minority interest income of $2.5 million reflected the minority partner's share of the Chloralkali joint venture's pretax loss.

Other income, net of other charges, was $15.0 million as compared with $16.2 million for 1999. Results for 1999 included a positive legal settlement with no counterpart in 2000, while the 2000 results included greater gains from asset sales.

Interest expense of $22.2 million declined $3 million from 1999 due primarily to the capitalized interest credit associated with the Chloralkali joint venture.

The effective tax rate for the period was 32.2%, down slightly from last year's rate of 33.5%.

On July 20, 2000, Donald M. James, Chairman and Chief Executive Officer, made certain statements concerning the Company's earnings outlook. Excerpts of the relevant press release quoting Mr. James are as follows:

Working Capital

Working capital, exclusive of debt and cash items, totaled $392.2 million at June 30, 2000, $88.7 million over the 1999 year-end amount of $303.5 million. Working capital at June 30, 2000 increased $68.3 million from the same date last year. Both of these increases resulted primarily from increases in receivables attributable to the increased revenues.

The Company's current ratio, which is based on all components of working capital, including cash and debt items, was 1.6 as of June 30, 2000. This compares to the 1.6 ratio at year-end 1999 and the 1.2 ratio at June 30, 1999. The increase in the current ratio from the prior year resulted primarily from the $109.1 million reduction in commercial paper.

Cash Flows

Net cash provided by operating activities totaled $114.8 million in the first half of 2000, slightly up from the $110.9 million generated in the same period last year. Cash used for investing activities was $177.5 million as compared with the year-to-date 1999 total of $850.5 million. This amount for 1999 reflects the acquisition of CalMat. Net cash provided by financing activities totaled $41.4 million, down significantly from the 1999 amount of $636.5 million. The 1999 cash provided by financing resulted from the financing of the CalMat acquisition.

Cash and cash equivalents, which totaled $31.5 million at June 30, 2000, were down $46 million from a year ago.

Short-term Borrowings

Short-term borrowings of $150.3 million as of June 30, 2000 consisted of notes payable to banks totaling $10.5 million and commercial paper of $139.8 million. The prior year amount, $251.4 million, consisted of notes payable to banks of $2.3 million, other notes payable of $.2 million and commercial paper of $248.9 million.

Long-term Obligations

As of June 30, 2000, long-term obligations were 26.6% of long-term capital and 49.1% of shareholders' equity. The corresponding 1999 percentages were 30.8% and 56.3%.

Common Stock Transactions

For a number of years, the Company has regularly purchased its own shares in the open market under its long-standing share purchase program. Factors considered in such purchases include cash flow generation, alternative investment opportunities, debt levels, and share price. The Company purchased no shares of common stock in 2000. Purchases of common stock in the first quarter of 1999 totaled 1,200 shares previously owned by CalMat and purchased as part of the acquisition at a total cost of $49.4 thousand, equal to an average price of $41.19 per share. No shares were purchased in the second quarter of 1999. The amount, if any, of future share purchases will be determined by management from time to time based upon various factors, including those listed above.

The Company is exposed to certain market risks arising from transactions that are entered into in the normal course of business. In order to manage or reduce this market risk, the Company occasionally utilizes derivative financial instruments.

To date, the Company has used commodity swap and option contracts to reduce its exposure to fluctuations in prices for natural gas. The fair value of these contracts as of June 30, 2000 and 1999 was not material. As a result of a 10% reduction in the price of natural gas, the Company would experience a potential loss in the fair value of the underlying commodity swap and option contracts based on the fair value at June 30, 2000 of approximately $1.5 million.

The Company is exposed to interest rate risk due to its various long-term debt instruments. As substantially all of this debt is at fixed rates, a decline in market interest rates would potentially result in a subsequent increase in the fair value of the liability. At June 30, 2000, the estimated fair value of these debt instruments was $660.6 million. The effect of a hypothetical decline in the market interest rate of 1% would increase the fair value of the liability by approximately $35.1 million.

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

Date        August 2, 2000